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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 PrintScore(STU stu[], 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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// printf("%d %d",n,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: AverSumofEveryStudent(stu, n, m);
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break;
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case 3: SortbyScore(stu, n, m, Descending);
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printf("\n按分数排序:\n");
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PrintScore(stu, n, m);
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break;
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case 4: SearchbyNum(stu, n, m);
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break;
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case 5:PrintScore(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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}
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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.输入数据\n");
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printf("2.计算总分与平均分\n");
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printf("3.按分数排序\n");
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printf("4.查找\n");
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printf("5.数据总汇\n");
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printf("0.退出\n");
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printf("请输入你的选择:");
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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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{
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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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{
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scanf("%f", &stu[i].score[j]);
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}
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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", i+1, stu[i].sum, stu[i].aver);
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}
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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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k = i;
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for (j=i+1; j<n; j++)
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{
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if (stu[j].num < stu[k].num) 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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/* ----------- end ----------- */
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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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for (i=0; i<n; i++)
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{
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if (stu[i].num == number)
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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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/* ----------- end ----------- */
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printf("\nNot found!\n");
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}
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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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