C Programming Tutorial - 58 - Pass by Reference vs Pass by V

#include <stdio.h>
#include <stdlib.h>

void passByValue(int i);
void passByAddress(int *i);

int main()
{
    //up to now we have been passing a copy of that variable in
    //that was called passing by value
    //we can pass in the actual variable by passing the address
    int tuna = 20;

    passByValue(tuna);
    printf("Passing by value, tuna is now %d \n", tuna);
    //not passing in a copy, but the actual variable
    passByAddress(&tuna);
    printf("Passing by address, tuna is now %d \n", tuna);

    return 0;
}

void passByValue(int i){
    i = 99;
    return;
}

void passByAddress(int *i){
    //dereference to get the value
    *i = 64;
    return;
}