/*
 * Extremely simple example of parameter passing, illustrating use
 * of pointer arguments to achieve something like pass by reference.
 */
#include <stdio.h>

/* pass x by value */
void foo(int x) { x = 20; }

/* pass *p "by reference" */
void bar(int* p) { *p = 20; }

/* main program */
int main(void) {
	int x = 10;
	foo(x);
	printf("%d\n", x);
	bar(&x);
	printf("%d\n", x);
	return 0;
}