dereference and address of operators shown simply

address_of_and_dereference.c

#include <stdio.h>

void change(int* value) {
    *value += 5; // dereference operator
}

int main() {
    int a = 5;
    
    printf("a = %d \n", a);
    
    // "&" is the address of operator & yields a pointer
    int* b = &a;
    
    change(b);

    printf("a = %d \n", a);
    
    change(&a);

    printf("a = %d \n", a); // should be 15

    return 0;
}