Question

sorry i modified the code now:

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

void main()
{
    int i=0;
    char** f=NULL;
    char* ff=NULL;

    ff="abcd";

    f=( char**)malloc ((i + 1) * sizeof (char *)+5);
    f[0]=ff;
 // strcpy(f[0],ff); (this again giving same error)
    strncat(f[0],"efg",3);
    printf("f : %s",f[0]);
}

I am getting some unhandled exception, Access violation writing error. Can anyone explain me the error I did here.
NOTE : sorry i modified the code now:

Thanks for the answers

Answer 1

you are setting f<-ff

ff points to the start of a constant char[] (“abcd”)
and then you change the value of *f (which is exactly *ff) thus – access violation.