Pass By Reference

pass_by_reference.c

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


void square_num(int *num);

int main()
{
    /* ====================================================================== */
    /* Pass By Reference */
    /* ====================================================================== */
    // C exclusively passes by value but simulates passing by reference because
    // it's a copy (they are local variables).
    int num = 5;
    square_num(&num);
    printf("result = %d\n", num);
    return 0;
}

void square_num(int *num)
{
     *num = (*num)*(*num);
}