Question

#include <stdio.h>

void main(){
    char *str[]={"aa","bb"};
    str[0][0]='h';
}

I receive a segmentation fault when executing this code. Does anyone know the reason?

Thanks in advance.

Answer 1

You are assigning to a location occupied by a string constant, an undefined behavior. If you know the max lengths of your strings, you can do this:

char ss[][3] = {"aa", "bb"};

It’s not a precise equivalent, but it should work. If you do not know max length, or do not want to waste a few bytes here and there, you can still pull it off with a little more work:

char aa[] = "aa";
char bbbb[] = "bbbb";
char *ss[] = {aa, bbbb};