/* 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 */
	The goal of the conititional statement below is to decide which of the two rates has to be used in our case to calculate interest. The correct value will be assigned to the variable interest_rate
	if (capital < THRESHOLD)
	interest_rate = rate1;
	else
	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);
	}