/* Example rate2.c
	Interest with variable rate
	Goal: The use of if-else for conditional calculations
	Author: Peter Brusilovsky
	*/
	#define THRESHOLD 5000
	#include <stdio.h>
	void main() {
	float rate1, rate2, interest_rate; /* interest rates in percents */
	float capital; /* capital in dollars */
	float annual_interest; /* annual interest in dollars */
	/* read data */
	printf("Interest rates (%%xx.xx): ");
	scanf("%f %f", &rate1, &rate2);
	printf("Capital ($$.cc): ");
	scanf("%f",&capital);
	/* calculate the rate */
	if (capital < THRESHOLD)
	interest_rate = rate1;
	else
	If the condition is false, i.e., the capital is greater or equal to the THRESHOLD, the value of capital < THRESHOLD expression will be 0 and "else" part of if will be executed.
	interest_rate = rate2;
	printf("The rate for $%.2f is %.2f%% ", capital, interest_rate);
	/* calculate capital */
	annual_interest = capital * interest_rate / 100;
	printf("Interest %6.2f; New capital %9.2f ", annual_interest, capital + annual_interest);
	}