使用结构创建文件

Question

我编写了这段代码，但它给出了分段错误。该循环仅适用于printf语句。请帮我纠正这个问题。

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


FILE *fp;
int n,i;

typedef struct transactions
{

 char bank_name;                    
 int amount;           
 int time; //to be given in the form:1320
 char location;
 int acc_no;      

}transaction;//structure

transaction t;

void main()
{
   printf("\nHow many records you would like to insert ? : ");
    scanf("%d",&n);
    fp=fopen("input.txt","r+");
    for(i=0;i<n;i++)
    {
        printf("\nEnter the transaction details");
        scanf("%s%d%d%s%d",t.bank_name,&t.amount,&t.time,t.location,&t.acc_no);
        fwrite(&t,sizeof(t),1,fp);
    }
    fclose(fp);
}

Answer 1

bank_name和location不是字符串，而是单个字符。但是您尝试使用%s将字符串存储在其中。因此程序会崩溃并烧毁。

Answer 2

编译时应该激活警告...

使用clang：

 % clang testt.c -Wall
testt.c:22:1: warning: return type of 'main' is not 'int' [-Wmain-return-type]
void main()
^
testt.c:30:28: warning: format specifies type 'char *' but the argument has type 'int' [-Wformat]
        scanf("%s%d%d%s%d",t.bank_name,&t.amount,&t.time,t.location,&t.acc_no);
               ~~          ^~~~~~~~~~~
testt.c:30:58: warning: format specifies type 'char *' but the argument has type 'int' [-Wformat]
        scanf("%s%d%d%s%d",t.bank_name,&t.amount,&t.time,t.location,&t.acc_no);
                     ~~                                  ^~~~~~~~~~
3 warnings generated.

使用gcc：

 % gcc testt.c -Wall
testt.c:22:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main()
      ^
testt.c: In function ‘main’:
testt.c:30:9: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
         scanf("%s%d%d%s%d",t.bank_name,&t.amount,&t.time,t.location,&t.acc_no);
         ^
testt.c:30:9: warning: format ‘%s’ expects argument of type ‘char *’, but argument 5 has type ‘int’ [-Wformat=]

我相信你可以自己解决问题（错误的类型）。