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  1. #include <iostream>
  2. #include <iomanip>  
  3. #include <cmath>
  4. using namespace std;
  5.  
  6. double calculate_inflation(double, double);
  7. int main()
  8. {
  9.    double yearAgo_price;
  10.    double currentYear_price;
  11.    double inflation_rate;  //!!! typo Rate
  12.    char again;
  13.  
  14.  do{
  15.       cout << "Enter the item price one year ago (or zero to quit) : " << endl;
  16.       cin >> yearAgo_price;
  17.  
  18.       cout << "Enter the item price today: " << endl;
  19.       cin >> currentYear_price;
  20.  
  21.        cout.setf(ios::fixed);  //!!! typo ;
  22.        cout.setf(ios::showpoint); //!!! typo iOS
  23.        cout.precision(2);
  24.  
  25.        inflation_rate=calculate_inflation(yearAgo_price, currentYear_price);
  26.        cout << "The inflation rate is " << (inflation_rate*100) << " percent." << endl;
  27.  
  28.        cout << "Do you want to continue (Y/N)?" << endl;
  29.        cin >> again;
  30.  
  31.       }while((again=='Y') || (again=='y'));  //!!! == not =
  32.  
  33.           return 0;
  34. }
  35.  
  36.    double calculate_inflation (double yearAgo_price, double currentYear_price)
  37.    {
  38.       return ((currentYear_price-yearAgo_price)/ yearAgo_price);
  39.    }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin 
120 110 y
90 88 y 
2 1 n
stdout 
Enter the item price one year ago (or zero to quit) : 
Enter the item price today: 
The inflation rate is -8.33 percent.
Do you want to continue (Y/N)?
Enter the item price one year ago (or zero to quit) : 
Enter the item price today: 
The inflation rate is -2.22 percent.
Do you want to continue (Y/N)?
Enter the item price one year ago (or zero to quit) : 
Enter the item price today: 
The inflation rate is -50.00 percent.
Do you want to continue (Y/N)?
https://ideone.com/mnzdxp
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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