Thread: How to change a letter in a char pointer?

Well there are pointers to memory you can't change, such as
char *A = "Slackware";

Which should be declared as const to begin with.

Code:

$ cat foo.c
#include <stdio.h>
#include <stdlib.h>
int main()
{
    char *A = "Slackware";
    puts(A);
    return 0;
}
$ gcc -Wall -Wextra -Wwrite-strings foo.c
foo.c: In function ‘main’:
foo.c:5:15: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
    5 |     char *A = "Slackware";
      |               ^~~~~~~~~~~

Then there are pointers to memory you can change.

Code:

$ cat foo.c
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
    char *A = malloc(20);
    strcpy(A,"Slackware");
    A[5] = '\0';
    puts(A);
    free(A);
    return 0;
}
$ gcc -Wall -Wextra -Wwrite-strings foo.c
$ ./a.out 
Slack