C++ : Write a program that outputs inflation rates for two successive years and

Question

Explanation / Answer

#include<iostream>
#include<iomanip>
#include<string>

using namespace std;

double getDoubleInput(string message);
double inflationRate(double oldPrice, double newPrice);
void Percent(double value);

int main()
{
double price1; // The current price of the item
double price2; // The price of the item one year ago
double price3; // The price of the item two years ago
double rate1; // The inflation rate for the first two years
double rate2; // The inflation rate for the second two years

price1 = getDoubleInput("Enter the current price:");
price2 = getDoubleInput("Enter the price from one year ago:");
price3 = getDoubleInput("Enter the price from two years ago:");

cout << endl;

rate1 = inflationRate(price2, price1);

cout << "Current year inflation: ";
Percent(rate1);

rate2 = inflationRate(price3, price2);

cout << "Inflation one year ago: ";
Percent(rate2);

cout << endl;

if (rate1 < rate2)
{
cout << "The inflation rate is increasing" << endl;
}
else if (rate1 > rate2)
{
cout << "The inflation rate is decreasing" << endl;
}
else
{
cout << "There is no change in the inflation rate" << endl;
}

system("pause");
return 0;
}

double getDoubleInput(string message)
{
double num;

cout << message << " ";
cin >> num;

while (!cin)
{
cin.clear();
cin.ignore(5000, ' ');

cout << "Please enter a double: ";
cin >> num;
}

return num;
}

double inflationRate(double oldPrice, double newPrice)
{
double rate;

rate = (newPrice - oldPrice) / oldPrice;

return rate;
}

void Percent(double value)
{
cout << fixed << setprecision(2);
cout << (value * 100) << "%" << endl;
}

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