#include <stdio.h> float average(float x, float y) { return (x + y)/2.0f; } /* main program - execution always starts here */ void main() { float average(float x, float y); /* Function prototype */ float value1 = 1.0F; float value2 = 2.0F; float r = 0.0F; r = average(value1, value2); printf("\nThe average is: %f", r); }