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Assigning char to char* using pointers

Let's say I have a char *str and I want to assign it characters one by time using using pointers and incrementing ?

I've done :

char *str;
char c = 'a';
*str++ = c;

But it doesn't work.

How can I do that ?

Solution

  • str is just a pointer. It doesn't point anywhere valid (especially not to some memory you could write to). A simple possibility would be to have it point to an array:

    char buf[1024] = {0}; // room for 1024 chars (or 1023 + a 0 byte for a string)
char *str = buf;
char c = 'a';
*str++ = c;