用 scanf 和文件构建结构

Question

#include <stdio.h>
#include <stdlib.h>

    struct data {
        char *first;
        char *last;
        int age;
        char *email;
        int bday[3];
    };

typedef struct data id;


void id_read(){
        FILE *fp;

为此目的创建文件

        fp=fopen("Data.txt" , "w");

读取数据并将其打印到文件中

        printf("Give First name please: ");
             scanf("%s" , &(id.first));
        fprintf( fp , "First name: %s" , id.first);
        printf("\nGive Last name please: ");
             scanf("%s" , &(id.last));
        fprintf(fp ,"\nLast name: %s" , id.last);
        printf("\nGive your email: ");
             scanf("%s" , &(id.email));
        fprintf(fp , "\nEmail: %s" , id.email);
        printf("\nGive birthday date: ");
        printf("\nDay: ");
             scanf("%d" , &id.bday[0]);
        printf("\nMonth: ");
             scanf("%d" , &(id.bday[1]));
        printf("\nYear: ");
             scanf("%d" , &(id.bday[2]));
        fprintf(fp ,"\nBirthdate: %d/%d/%d" , id.bday[0] , id.bday[1] , id.bday[2]);
        printf("\nGive your age: ");
             scanf("%d", &(id.age));
        fprintf(fp , "\nAge: %d" , id.age);
        fclose(fp);
}

主要功能

 int main(){
        printf("Give your ID carefully! \n\n");
        id_read();
        return 0;
 }

scanf 的编译器错误。

 [Error] expected expression before ')' token.
 [Error] expected ')' before '.' token

Answer 1

两件事。

id 是 typedef 数据类型，而不是变量本身。需要有一个id 类型的变量，比如id input。那么，

1. 需要使用malloc()为指针input.first分配内存。
2. scanf("%s" , &(id.first));需要改为scanf("%s" , input.first);

其他指针变量也一样。