结构体设计（计算、查找）

Question

要求：
输入学生各科成绩，分别设计函数来计算学生各科的平均成绩、各科全部学生的平均成绩、查找学生成绩，然后对成绩进行输出。
希望有小伙伴可以帮忙看一下代码有没有什么错误，以及求问“各科全部学生的平均成绩”这一块的函数怎么写啊？
#include<stdio.h>
#include<string.h>
struct students_list{
char name[20];
int Math[50];
Int English[50];
Int Science[50];
};
void student_average(struct students_list students[ ],intneme);
void subject_average(struct students_list students[ ],intsubject);
void search_student(struct students_list students[ ],char*name);
int Count=0;

int main(void)
{
int choice,i;
char name[20];
char subject[10];
struct students_list students[50];
for(i=1;;i++){
printf("请依次输入学生姓名、数学成绩、英语成绩、科学成绩:");
scanf("%s %d3（不知道为什么不能连着输入三个d）",&students[i].name,&students[i].Math, &students[i].English, &students[i].Science);
Count++;
}
do{
printf("学生成绩功能选项：1:计算学生平均分 2:计算课程平均分 3:查询学生成绩 0:退出并输出成绩\n");
printf("请选择功能："); scanf("%d", &choice);
switch(choice){
case 1:
printf("请输入要查找的学生姓名:");
scanf("%s", name);
student_average(students,name);
break;
case 2:
printf("请输入要查找的课程:");
scanf("%s", subject);
subject_average(students,subject);
break;
case 3:
printf("请输入要查找的学生姓名:");
scanf("%s", name);
search_student(students, name);
break;
case 0: break;
}
}while(choice != 0);
for(i=1;i<Count;i++){
printf("%s: %d3（不知道为什么不能连着输入三个d）",students[i].name,students[i].Math, students[i].English, students[i].Science);
}
return 0;
}
/学生平均分/
void student_average(struct students_list students[ ],intneme)
{
int i,flag = 0;
double average;
if(Count == 0){
printf("成绩单是空的!\n");
return;
}
for(i = 0; i <=Count; i++)
if(strcmp(name, friends[i].name) == 0){ / 找到学生*/
flag=1; break;
}
if(flag){
average=(students[i].Math+students[i].English+students[i].Science)/3.0
printf(“student_average:%lf\n”,average);
}
else
printf("无此学生!");
}
/查询学生成绩/
void search_student(struct students_list students[ ],char*name)
{ int i, flag = 0;
if(Count == 0){
printf("成绩单是空的!\n");
return;
}
for(i = 0; i < =Count; i++)
if(strcmp(name, friends[i].name) == 0){
flag=1; break;
}
if(flag){
printf("Math: %d\n", students[i].Math);
printf("English: %d\n", students[i].English);
printf("Science: %d\n", students[i].Science);
}
else
printf("无此学生!");
}

Answer 1

你题目的解答代码如下：

#include <stdio.h>
#include <string.h>
struct students_list
{
    char name[20];
    int Math; //不要用数组
    int English;  //int是全小写
    int Science;
};
void student_average(struct students_list students[], char *neme);
void subject_average(struct students_list students[], char *subject);
void search_student(struct students_list students[], char *name);
int Count = 0;

int main(void)
{
    int choice, i;
    char name[20];
    char subject[10];
    struct students_list students[50];
    printf("输入学生人数:");
    scanf("%d", &Count);
    for (i = 0;i < Count; i++)
    {
        printf("请依次输入学生姓名、数学成绩、英语成绩、科学成绩:");
        scanf("%s %d %d %d", students[i].name, &students[i].Math, &students[i].English, &students[i].Science);
    }
    do
    {
        printf("学生成绩功能选项：1:计算学生平均分 2:计算课程平均分 3:查询学生成绩 0:退出并输出成绩\n");
        printf("请选择功能：");
        scanf("%d", &choice);
        switch (choice)
        {
        case 1:
            printf("请输入要查找的学生姓名:");
            scanf("%s", name);
            student_average(students, name);
            break;
        case 2:
            printf("请输入要查找的课程:");
            scanf("%s", subject);
            subject_average(students, subject);
            break;
        case 3:
            printf("请输入要查找的学生姓名:");
            scanf("%s", name);
            search_student(students, name);
            break;
        case 0:
            break;
        }
    } while (choice != 0);
    for (i = 0; i < Count; i++)
    {
        printf("%s: %d %d %d\n", students[i].name, students[i].Math, students[i].English, students[i].Science);
    }
    return 0;
}
/* 学生平均分 */
void student_average(struct students_list students[], char *name)
{
    int i, flag = 0;
    double average;
    if (Count == 0)
    {
        printf("成绩单是空的!\n");
        return;
    }
    for (i = 0; i < Count; i++)
        if (strcmp(name, students[i].name) == 0)
        {
            /* 找到学生 */
                flag = 1;
            break;
        }
    if (flag)
    {
        average = (students[i].Math + students[i].English + students[i].Science) / 3.0;
        printf("student_average: %lf\n", average);
    }
    else
        printf("无此学生!");
}
/* 查询学生成绩 */
    void search_student(struct students_list students[], char *name)
{
    int i, flag = 0;
    if (Count == 0)
    {
        printf("成绩单是空的!\n");
        return;
    }
    for (i = 0; i < Count; i++)
        if (strcmp(name, students[i].name) == 0)
        {
            flag = 1;
            break;
        }
    if (flag)
    {
        printf("Math: %d\n", students[i].Math);
        printf("English: %d\n", students[i].English);
        printf("Science: %d\n", students[i].Science);
    }
    else
        printf("无此学生!");
}
void subject_average(struct students_list students[], char *subject)
{
    int i;
    double average, sum=0;
    if (Count == 0)
    {
        printf("成绩单是空的!\n");
        return;
    }
    for (i = 0; i < Count; i++)
    {
        if (strcmp(subject, "Math") == 0)
        {
            sum += students[i].Math;
        }
        else if (strcmp(subject, "English") == 0)
        {
            sum += students[i].English;
        }
        else if (strcmp(subject, "Science") == 0)
        {
            sum += students[i].Science;
        }
    }
    average = sum/Count;
    printf("%s average: %lf\n", subject, average);
}

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