习题 9.5 有10个学生，每个学生的数据包括学号、姓名、3门课程的成绩，从键盘输入10个学生数据，要求输出3门课程总平均成绩，以及最高分的学生的数据（包括学号、姓名、3门课程成绩、平均分数）。

小灰灰 2022-05-28 02:55 222阅读 0赞

### C程序设计（第四版） 谭浩强 习题9.5 个人设计 ###

#### 习题 9.5 有10个学生，每个学生的数据包括学号、姓名、3门课程的成绩，从键盘输入10个学生数据，要求输出3门课程总平均成绩，以及最高分的学生的数据（包括学号、姓名、3门课程成绩、平均分数）。 ####

代码块：

方法1：

#include <stdio.h>
    struct student
    {
        int num;
        char name[10];
        float score[3];
        float aver;
    } stu[10];
    void input(struct student s[], int n);
    void average(struct student s[], int n);
    void high_score(struct student s[], int n);
    int main()
    {
        input(stu, 10);
        average(stu, 10);
        high_score(stu, 10);
        return 0;
    }
    void input(struct student s[], int n)
    {
        int i, j;
        for (i=0; i<n; i++){
            printf("Please enter No.%d student num name score: ", i+1);
            scanf("%d %s", &s[i].num, s[i].name);
            for (j=0; j<3; scanf("%f", &s[i].score[j++]));
        }
    }
    void average(struct student s[], int n)
    {
        int i, j;
        float sum;
        for (i=0, sum=0.0; i<n; i++)
            for (j=0; j<3; sum+=s[i].score[j++]);
        printf("Average=%.2f\n", sum/n);
    }
    void high_score(struct student s[], int n)
    {
        int i, j;
        float sum;
        struct student temp;
        for (i=0; i<n; i++){
            for (j=0, sum=0.0; j<3; sum+=s[i].score[j++]);
            s[i].aver=sum/3;
        }
        for (i=0; i<n; i++)
            for (j=i+1; j<n; s[i].aver<s[j].aver ? temp=s[i], s[i]=s[j], s[j]=temp, j++ : j++);
        printf("The highest student info: %d %-5s ", s[0].num, s[0].name);
        for (i=0; i<3; printf("%.2f ", s[0].score[i++]));
        printf("%.2f\n", s[0].aver);
    }

方法2：

#include <stdio.h>
    #include <stdlib.h>
    struct Student{
        int num; 
        char name[20];
        float score[3];
    };
    void input(Student *st);
    void print(Student *st);
    int main()
    {
        Student *stu=(Student*)malloc(3*sizeof(Student));
        input(stu);
        print(stu);
        system("pause");
        return 0;
    }
    void input(Student *st)
    {
        int i;
        Student *p;
        for (p=st, i=0; p<st+3; p++, i++){
            printf("Please enter No.%d student info: ", i+1);
            scanf("%d %s", &p->num, p->name);
            for (i=0; i<3; scanf("%f", &p->score[i++]));
        }
    }
    void print(Student *st)
    {
        int i, j;
        float aver, sum[3], total, max;
        Student *p;
        for (p=st, i=0, total=0; p<st+3; p++, i++){
            for (j=0, sum[i]=0; j<3; sum[i]+=p->score[j++]);
            total+=sum[i]/3;
        }
        aver=total/3;
        printf("Total Average: %.2f\n", aver);
        for (i=0, max=sum[i]; i<3; i++)
            if (sum[i]>max){
                max=sum[i];
                j=i;
            }
        printf("The highest score student info: %d %s ", (st+j)->num, (st+j)->name);
        for (i=0; i<3; printf("%.2f ", (st+j)->score[i++]));
        printf("\n");
    }