code_crashed

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

struct str_in{
    char str[100];
    int num;
    };

int main()
{
    struct str_in str_in_ar[3];
    int i;
    char ap_str[200];
    FILE *fp;

    for(i=0;i<3;i++)
    {
        printf("Enter a string(100 character limit): ");
        fflush(stdin);
        gets(str_in_ar[i].str);
        printf("Enter a number: ");
        fflush(stdin);
        scanf("%d",&str_in_ar[i].num);
    }

    printf("Writing it to file.....");

    fp = fopen("str_1.txt","a");
    if(fp)
    {
        for(i=0;i<3;i++)
          strcpy(ap_str,str_in_ar[i].str);
          strcat(ap_str, " ");
          strcat(ap_str, (char)str_in_ar[i].num);
          //strcat(ap_str, "\n");
          fputs(ap_str,fp);
          memset(ap_str,0,200);
        fclose(fp);
    }

    return 0;
}