结构体为什么求不出总分？ - 编程论坛

输入5名学生的学号、姓名和3门课程（programming、 database、 network）的成绩，存入一个结构体数组中。编写sumScore函数，其功能是计算学生3门课的总成绩，并存入结构体数组中。在主函数中输入学生信息，调用 sumScore函数，并输出学生的学号、姓名和总成绩信息。
下面是我目前写出来的代码、

程序代码：

#include <stdio.h>
struct courses
{
    int programming;
    int database;
    int network;
    double score;
};
struct student /*学生信息结构定义*/
{
    int num;       /*学号*/
    char name[10]; /*姓名*/
    int sum;       /*总分*/
    struct courses sc[3];
};
int sumScore(struct student students[]);
int main()
{
    struct student students[5];
    int i;
    for (i = 0; i < 3; i++)
    {
            printf("num:");
            scanf("%d",&students[i].num);
            printf("name:");
            scanf("%s",students[i].name);
            printf("programming score:");
            scanf("%d",&students[i].sc[0].programming);
            printf("network score:");
            scanf("%d",&students[i].sc[1].network);
            printf("database score:");
            scanf("%d",&students[i].sc[2].database);
    }
    sumScore(students);
    printf("num\tname\tsum\n");
    for (i = 0; i < 3; i++)
    {
        printf("%d\t%s\t%d\n",students[i].num,students[i].name,students[i].sum);
    }
    return 0;
}
int sumScore(struct student *students)
{
    int i;
    for (i = 0; i < 3; i++)
    {
            students[i].sum=students[i].sc[0].database+students[i].sc[1].network+students[i].sc[2].programming;
    }
}