Authors:
Walter Savitch ,julia Lobur
Chapter:
Procedural Abstraction And Functions That Return A Value
Exercise:
Programming Projects
Question:4 | ISBN:9780321531346 | Edition: 7
Question
4. Write a program to gauge the rate of inflation for the past year. The program
asks for the price of an item (such as a hot dog or a one carat diamond)
both one year ago and today. It estimates the inflation rate as the
difference in price divided by the year ago price. Your program should
allow the user to repeat this calculation as often as the user wishes.
Define a function to compute the rate of inflation. The inflation rate
should be a value of type double giving the rate as a percent, for example
5.3 for 5.3%.
Answer
#include<iostream>
#include<cmath>
using namespace std;
double inflationMethod(double previousCost,double currentCost);
void main()
{
double previousCost,currentCost,rate;
char option;
do
{
cout<<"Enter previous year cost of the item:";
cin>>previousCost;
cout<<"Enter present year cost of the item:";
cin>>currentCost;
rate = inflationMethod(previousCost,currentCost);
cout<<"Rate of inflation:"<<rate*100<<"%"<<endl;
cout<<"To continue then enter 'Y'\n";
cin>>option;
system("pause");
}
double inflationMethod(double previousCost,double currentCost)
{
return ((currentCost - previousCost)/currentCost);
}
Output:
Enter previous year cost of the item: 120
Enter present year cost of the item:145
Rate of inflation: 0.172414%
To continue then enter 'Y' n