Programming

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

int main()
{
        char a[11]="10111988";
        char b[11];
        int i,j=0,len;
        printf ("The input is :<%s>\n", a);
        len=strlen(a);
        for(i=0;i<len;i++){
                b[j++]=a[i];
                if (i==1 || i==3) {
                        b[j++]='.';
                }
        }
        b[j]='\0';
        printf ("The o/p string is <%s>\n",b);
        return 1;
}

The input is :<10111988>
The o/p string is <10.11.1988>

strcpy(a,data[0].first.last);

        char a[11]="10111988"; // 10 chars, fits in 11 bytes with terminating NUL.
        char b[11];            // 11 bytes can't hold 12 chars plus terminating NUL

strcpy(a,data[0].first.last);