For one, you can’t modify string literals. It’s undefined behavior.
To fix that you can make str
a local array:
char str[] = "First string";
Now, you will have a second problem, is that str
isn’t large enough to hold str2
. So you will need to increase the length of it. Otherwise, you will overrun str
– which is also undefined behavior.
To get around this second problem, you either need to make str
at least as long as str2
. Or allocate it dynamically:
char *str2 = "Second string";
char *str = malloc(strlen(str2) + 1); // Allocate memory
// Maybe check for NULL.
strcpy(str, str2);
// Always remember to free it.
free(str);
There are other more elegant ways to do this involving VLAs (in C99) and stack allocation, but I won’t go into those as their use is somewhat questionable.
As @SangeethSaravanaraj pointed out in the comments, everyone missed the #import
. It should be #include
:
#include <stdio.h>
#include <string.h>