learn_c/pointers/char_pointer.c

#include <stdio.h>

#define DOLLARS 0x24;

// Example of function declaration. This is what the preprocessor does with the header files
void set_to_y(char *p);

int main()
{
    char my_char = 'a';
    char *p_char;

    p_char = &my_char;

    printf("The value of *p_char is set to %c\n", *p_char);
    set_to_y(p_char);

    printf("Lets check the value of my_char: %c\n", my_char);
    printf("You, know what I want to just muck with your memory directly\n");

    //derefence the location and just set the byte we want
    *p_char = DOLLARS;
    printf("So all your bits now should show my_char as $ DOLLARS. Lets see: %c\n", my_char);

    return 0;
}

// This is function definition
void set_to_y(char *p)
{
    fprintf(stdout, "Setting the value at address %p from %c to y\n", &p, *p);
    *p = 'y';
}