c - 如何打印结构体的成员？

Question

我编写了以下程序来输入学生的凭据，然后打印它们。但是，当我输入完两个学生的记录(允许输入的最大记录数)时，它不会打印它们。这是程序。有人能指出错误吗？谢谢。

#include<stdio.h>
#include<string.h>

struct student
{
    char name[20];
    char mobile_no[10];
    char class[5];
};

int main()
{
    static struct student s[2];
    int m=0,n=0,i;
    char c;
    printf("Enter the name , mobile_no and class of the students\n");
    while((scanf("%c",&s[m].name[n]))!= EOF)
    {
        for(n=0; n<=19; n++)
            scanf("%c",&s[m].name[n]);
        for(n=0; n<=9; n++)
            scanf("%c",&s[m].mobile_no[n]);
        for(n=0; n<=4; n++)
            scanf("%c",&s[m].class[n]);
        scanf("%c",&c);  //scans for the newline character \n
        n = 0;
        m++;
    }

    for(i=0 ; i<m ; i++)
    {
        printf("%s%3s%3s\n",s[i].name,s[i].mobile_no,s[i].class); //prints the structure
    }
}

Answer 1

我不做家庭作业，但你很幸运。请记住，您输入的长度不能超过结构字符串中声明的长度 - 1. 自己进行审查、释放等。

struct student
{
    char name[20];
    char mobile_no[10];
    char _class[5];
};

int read_students(struct student *s) 
{
    int m = 0;
    printf("Enter the name , mobile_no and class of the students. Name == exit for exit\n");
    while (1)
    {
        char tmp[20];
        printf("Name: ");
        scanf("%s", tmp);
        if (!strcmp(tmp, "exit")) break;
        if ((s = (struct student *)realloc(s, sizeof(struct student) * (m + 1))) == NULL) {m = -1; break;}
        strcpy(s[m].name, tmp);
        printf("Mobile: ");
        scanf("%s", s[m].mobile_no);
        printf("Class: ");
        scanf("%s", s[m]._class);

        m++;
    }

    if (m != -1)
    {   
        printf("Number of students: %d\n", m);

        for (int i = 0; i<m; i++)
        {
            printf("%s %3s %3s\n", s[i].name, s[i].mobile_no, s[i]._class);//prints the structure
         }
    }
    return m;
}

在主函数中:

struct student *s = NULL;
int numberofstudentds;

numberofstudentds = read_students(s);