Cannot modify C string

Question

Consider the following code.

int main(void) {
    char * test = \"abcdefghijklmnopqrstuvwxyz\";
    test[5] = \'x\';
    printf(\"%s\\n\", test);
    return EXIT_         


        

Answer 1

Char pointers defined with an initialization value go into a read-only segment. To make them modifiable, you either need to create them on the heap (e.g. with new/malloc) or define them as an array.

Not modifiable:

char * foo = "abc";

Modifiable:

char foo[] = "abc";