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//1 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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//2 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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//3 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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//4 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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// 5使数据按升序排序
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int Ascending(float a, float b)
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// 6使数据按降序排序
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int Descending(float a, float b)
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// 7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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// 8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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// 9交换两个字符串
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void SwapChar(char x[], char y[])
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// 10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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// 11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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// 12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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// 13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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// 14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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// 15函数功能： 打印学生成绩
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// 16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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//17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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