#include <stdio.h>

/* Prototype */
float Square(float x);

/* Main function */
int main()
{
    float sum;
    sum = Square(3) + Square(4.);
    printf("%g + %g = %g\n",
	   Square(3), Square(4.), sum);
    return 0;
}

/* The function */
float Square(float x)
{
    return x*x;
}