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# System
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#学生成绩管理系统代码
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## 多个函数的使用
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## 利用结构体
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下面是代码库
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````c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_LEN 10 // 字符串最大长度
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#define STU_NUM 30 // 最多的学生人数
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#define COURSE_NUM 6 // 最多的考试科目数
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typedef struct student
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{
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long num; // 每个学生的学号
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char name[MAX_LEN]; // 每个学生的姓名
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float score[COURSE_NUM]; // 每个学生COURSE_NUM门功课的成绩
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float sum; // 每个学生的总成绩
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float aver; // 每个学生的平均成绩
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}STU;
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int Menu(void);
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void ReadScore(STU stu[], int n, int m);
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void AverSumofEveryStudent(STU stu[], int n, int m);
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void AverSumofEveryCourse(STU stu[], int n, int m);
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void SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b));
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int Ascending(float a, float b);
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int Descending(float a, float b);
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void SwapFloat(float *x, float *y);
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void SwapLong(long *x, long *y);
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void SwapChar(char x[], char y[]);
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void AsSortbyNum(STU stu[], int n, int m);
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void SortbyName(STU stu[], int n, int m);
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void SearchbyNum(STU stu[], int n, int m);
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void SearchbyName(STU stu[], int n, int m);
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void StatisticAnalysis(STU stu[], int n, int m);
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void PrintScore(STU stu[], int n, int m);
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void WritetoFile(STU record[], int n, int m);
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void ReadfromFile(STU record[], int *n, int *m);
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int main(void)
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{
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char ch;
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int n = 0, m = 0;
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STU stu[STU_NUM];
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printf("Input student number(n<%d):", STU_NUM);
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scanf("%d", &n);
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printf("Input course number(m<=%d):",COURSE_NUM);
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scanf("%d", &m);
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while (1)
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{
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ch = Menu(); // 显示菜单，并读取用户输入
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switch (ch)
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{
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case 1:ReadScore(stu, n, m);
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break;
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case 2: AverSumofEveryCourse(stu, n, m);
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break;
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case 3: AverSumofEveryStudent(stu, n, m);
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break;
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case 4: SortbyScore(stu, n, m, Descending);
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printf("\nSort in descending order by score:\n");
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PrintScore(stu, n, m);
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break;
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case 5: SortbyScore(stu, n, m, Ascending);
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printf("\nSort in ascending order by score:\n");
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PrintScore(stu, n, m);
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break;
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case 6: AsSortbyNum(stu, n, m);
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printf("\nSort in ascending order by number:\n");
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PrintScore(stu, n, m);
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break;
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case 7: SortbyName(stu, n, m);
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printf("\nSort in dictionary order by name:\n");
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PrintScore(stu, n, m);
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break;
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case 8: SearchbyNum(stu, n, m);
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break;
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case 9: SearchbyName(stu, n, m);
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break;
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case 10: StatisticAnalysis(stu, n, m);
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break;
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case 11:PrintScore(stu, n, m);
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break;
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case 12:WritetoFile(stu, n, m);
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break;
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case 13:ReadfromFile(stu, &n, &m);
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break;
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case 0: printf("End of program!");
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exit(0);
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default:printf("Input error!");
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}
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}
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return 0;}
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// 函数功能：显示菜单并获得用户键盘输入的选项
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int Menu(void)
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{
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int itemSelected;
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printf("Management for Students' scores\n");
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printf("1.Input record\n");
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printf("2.Calculate total and average score of every course\n");
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printf("3.Calculate total and average score of every student\n");
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printf("4.Sort in descending order by score\n");
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printf("5.Sort in ascending order by score\n");
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printf("6.Sort in ascending order by number\n");
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printf("7.Sort in dictionary order by name\n");
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printf("8.Search by number\n");
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printf("9.Search by name\n");
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printf("10.Statistic analysis\n");
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printf("11.List record\n");
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printf("12.Write to a file\n");
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printf("13.Read from a file\n");
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printf("0.Exit\n");
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printf("Please Input your choice:");
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scanf("%d", &itemSelected); // 读入用户输入
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return itemSelected;
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}
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// 函数功能：输入n个学生的m门课成绩
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void ReadScore(STU stu[], int n, int m)
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{
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int i, j;
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printf("Input student's ID, name and score:\n");
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/* ---------- begain ---------- */
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for(i=0;i<n;i++)
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{scanf("%ld%s",&stu[i].num,stu[i].name);
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for (j=0; j<m; j++)
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scanf("%f",&stu[i].score[j]);
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}
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/* ----------- end ----------- */
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}
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// 函数功能：计算每个学生各门课程的总分和平均分
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void AverSumofEveryStudent(STU stu[], int n, int m)
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{
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int i, j;
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for (i=0; i<n; i++)
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{
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stu[i].sum = 0;
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for (j=0; j<m; j++)
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{
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stu[i].sum = stu[i].sum + stu[i].score[j];
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}
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stu[i].aver = m>0 ? stu[i].sum / m : -1;
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printf("student %d: sum = %.0f, aver = %.0f\n",
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i+1, stu[i].sum, stu[i].aver);
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}
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}
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// 函数功能：计算每门课程的总分和平均分
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void AverSumofEveryCourse(STU stu[], int n, int m)
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{
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int i, j;
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float sum[COURSE_NUM], aver[COURSE_NUM];
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/* ---------- begain ---------- */
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for (j=0; j<m; j++)
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{
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sum[j] = 0;
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for (i=0; i<n; i++)
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{
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sum[j] += stu[i].score[j];
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}
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aver[j]=sum[j]/i;
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printf("student %d: sum = %.0f, aver = %.0f\n",
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j+1, sum[j], aver[j]);
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}
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/* ----------- end ----------- */
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}
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// 函数功能：按选择法将数组sum的元素值排序
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void SortbyScore(STU stu[],int n,int m,int (*compare)(float a,float b))
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{
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int i, j, k, t;
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for (i=0; i<n-1; i++)
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{
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k = i;
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for (j=i+1; j<n; j++)
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{
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if ((*compare)(stu[j].sum, stu[k].sum)) k = j;
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}
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if (k != i)
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{
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for (t=0; t<m; t++) // 交换m门课程的成绩
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{
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SwapFloat(&stu[k].score[t], &stu[i].score[t]);
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}
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SwapFloat(&stu[k].sum, &stu[i].sum); // 交换总分
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SwapFloat(&stu[k].aver, &stu[i].aver); // 交换平均分
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SwapLong(&stu[k].num, &stu[i].num); // 交换学号
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SwapChar(stu[k].name, stu[i].name); // 交换姓名
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}
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}
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}
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// 使数据按升序排序
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int Ascending(float a, float b)
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{
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return a < b; // 这样比较决定了按升序排序，如果a<b，则交换
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}
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// 使数据按降序排序
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int Descending(float a, float b)
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{
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return a > b; // 这样比较决定了按降序排序，如果a>b，则交换
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}
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// 交换两个单精度浮点型数据
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void SwapFloat(float *x, float *y)
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{
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float temp;
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temp = *x;
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*x = *y;
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*y = temp;
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}
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// 交换两个长整型数据
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void SwapLong(long *x, long *y)
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{
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long temp;
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temp = *x;
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*x = *y;
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*y = temp;
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}
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// 交换两个字符串
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void SwapChar(char x[], char y[])
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{
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char temp[MAX_LEN];
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strcpy(temp, x);
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strcpy(x, y);
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strcpy(y, temp);
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}
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// 函数功能：按选择法将数组num的元素值按从低到高排序
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void AsSortbyNum(STU stu[], int n, int m)
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{
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int i, j, k, t;
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for (i=0; i<n-1; i++)
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{
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/* ---------- begain ---------- */
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/* ----------- end ----------- */
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}
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}
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// 函数功能：交换法实现字符串按字典顺序排序
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void SortbyName(STU stu[], int n, int m)
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{
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int i, j, t;
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for (i=0; i<n-1; i++)
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{
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for (j = i+1; j<n; j++)
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{
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if (strcmp(stu[j].name, stu[i].name) < 0)
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{
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for (t=0; t<m; t++)// 交换m门课程的成绩
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{
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SwapFloat(&stu[i].score[t], &stu[j].score[t]);
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}
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SwapFloat(&stu[i].sum, &stu[j].sum); // 交换总分
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SwapFloat(&stu[i].aver, &stu[j].aver); // 交换平均分
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SwapLong(&stu[i].num, &stu[j].num); // 交换学号
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SwapChar(stu[i].name, stu[j].name); // 交换姓名
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}
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}
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}
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}
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// 函数功能：按学号查找学生成绩并显示查找结果
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void SearchbyNum(STU stu[], int n, int m)
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{
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long number;
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int i, j;
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printf("Input the number you want to search:");
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scanf("%ld", &number);
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/* ---------- begain ---------- */
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/* ----------- end ----------- */
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printf("\nNot found!\n");
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}
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// 函数功能：按姓名的字典顺序排出成绩表
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void SearchbyName(STU stu[], int n, int m)
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{
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char x[MAX_LEN];
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int i, j;
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printf("Input the name you want to search:");
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scanf("%s", x);
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for (i=0; i<n; i++)
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{
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if (strcmp(stu[i].name, x) == 0)
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{
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printf("%ld\t%s\t", stu[i].num, stu[i].name);
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for (j=0; j<m; j++)
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{
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printf("%.0f\t", stu[i].score[j]);
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}
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printf("%.0f\t%.0f\n", stu[i].sum, stu[i].aver);
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return;
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}
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}
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printf("\nNot found!\n");
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}
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// 函数功能：统计各分数段的学生人数及所占的百分比
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void StatisticAnalysis(STU stu[], int n, int m)
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{
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int i, j, t[6];
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for (j=0; j<m; j++)
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{
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printf("For course %d:\n", j+1);
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memset(t, 0, sizeof(t)); // 将数组t的全部元素初始化为0
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for (i=0; i<n; i++)
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{
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if (stu[i].score[j]>=0 && stu[i].score[j]<60)t[0]++;
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else if (stu[i].score[j]<70) t[1]++;
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else if (stu[i].score[j]<80) t[2]++;
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else if (stu[i].score[j]<90) t[3]++;
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else if (stu[i].score[j]<100) t[4]++;
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else if (stu[i].score[j] == 100) t[5]++;
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}
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for (i=0; i<=5; i++)
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{
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if (i==0) printf("<60\t%d\t%.2f%%\n",t[i],(float)t[i]/n*100);
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else if (i==5) printf("%d\t%d\t%.2f%%\n",
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(i+5)*10,t[i],(float)t[i]/n*100);
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else printf("%d-%d\t%d\t%.2f%%\n",
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(i+5)*10, (i+5)*10+9, t[i], (float)t[i]/n*100);
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}
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}
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}
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// 函数功能： 打印学生成绩
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void PrintScore(STU stu[], int n, int m)
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{
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int i, j;
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for (i=0; i<n; i++)
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{
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printf("%ld\t%s\t", stu[i].num, stu[i].name);
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for (j=0; j<m; j++)
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{
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printf("%.0f\t", stu[i].score[j]);
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}
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printf("%.0f\t%.0f\n", stu[i].sum, stu[i].aver);
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}
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}
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// 输出n个学生的学号、姓名及m门课程的成绩到文件student.txt中
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void WritetoFile(STU stu[], int n, int m)
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{
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FILE *fp;
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int i, j;
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if ((fp = fopen("student.txt","w")) == NULL)
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{
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printf("Failure to open score.txt!\n");
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exit(0);
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}
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fprintf(fp, "%d\t%d\n", n, m); //将学生人数和课程门数写入文件
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for (i=0; i<n; i++)
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{
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fprintf(fp, "%10ld%10s", stu[i].num, stu[i].name);
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for (j=0; j<m; j++)
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{
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fprintf(fp, "%10.0f", stu[i].score[j]);
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}
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fprintf(fp, "%10.0f%10.0f\n", stu[i].sum, stu[i].aver);
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}
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fclose(fp);
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}
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//从文件中读取学生的学号、姓名及成绩等信息写入到结构体数组stu中
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void ReadfromFile(STU stu[],int *n, int *m)
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{
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FILE *fp;
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int i, j;
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if ((fp = fopen("student.txt","r")) == NULL)
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{
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printf("Failure to open score.txt!\n");
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exit(0);
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}
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fscanf(fp, "%d\t%d", n, m); // 从文件中读出学生人数和课程门数
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for (i=0; i<*n; i++) //学生人数保存在n指向的存储单元
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{
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fscanf(fp, "%10ld", &stu[i].num);
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fscanf(fp, "%10s", stu[i].name);
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for (j=0; j<*m; j++)//课程门数保存在m指向的存储单元
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{
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fscanf(fp, "%10f", &stu[i].score[j]); //不能用%10.0f
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}
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fscanf(fp, "%10f%10f", &stu[i].sum, &stu[i].aver);//不能用%10.0f
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}
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fclose(fp);
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}
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```` |
