// the difference between arguments and parameters
// for predefined functions
#include <stdio.h>

// function prototype
float  half_of (float);

// main() function
void  main(void)
{
	float  x = 3.5, y = 65.11, z;
	
	// In this call, x is the argument to half_of().
	z = half_of(x);
	printf("The function call statement is z = half_of(x)\n");
	printf("where x = 3.5 and y = 65.11\n\n");
	printf("Passing argument x\n");
	printf("The value of z = %f \n", z);

	// In this call, y is the argument to half_of()
	z = half_of(y);
	printf("\nPassing argument y\n");
	printf("The value of z = %f \n\n", z);
}

// function definition, must receive one float value that will be placed in
// k and must return a float value back to the caller
float    half_of(float  k)
{
	// k is the parameter, a placeholder.  Each time half_of() is called,
	// k may has different value that was passed as an argument.
	return  (k/2);
}