Stress impairs cognitive functions - The loss of those functions can explain why programming is hard(the-programmers-stone.com)

    #include <stdio.h>

    void fn(char *s) {
        printf("[%s]\n", s);
    }

    int main() {
        char *s;
        s = "hello world";

        fn(s);

        return 0;
    }

    #include <stdio.h>

    void fn(int s) {
        printf("[%s]\n", (char *)s);
    }

    int main() {
        char *s;
        s = "hello world";

        fn((int)s);

        return 0;
    }

    #include <stdio.h>

    void fn(char *c) {
        printf("[%c]\n", *c);
    }

    int main() {
        char c = 'a';

        fn(&c);

        return 0;
    }

    #include <stdio.h>

    void fn(char *c) {
        printf("[%c]\n", c);
    }

    int main() {
        int c = 'a';

        fn((char *)c);

        return 0;
    }

    #include <stdio.h>

    void fn(char c) {
        printf("[%c]\n", c);
    }

    int main() {
        char c = 'a';

        fn(c);

        return 0;
    }

  #include <stdio.h>
  #include <stdlib.h>
  
  void fn(char* c) {
      printf("[%c]\n", *c);
  }
  
  int main() {
      char* c;
      c = malloc( sizeof(char) );
      *c = 'a';

      printf("start\n");
  
      fn(c);
  
      return 0;
  }