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  1. // Torrez, Elaine                    CS1A                    Chapter 5, P. 298, #3
  2. /*******************************************************************************************
  3.  *
  4.  * AVERAGE RAINFALL
  5.  * ________________________________________________________________________________________
  6.  * This program calculates the average rainfall over a given number of years.
  7.  * The user enters the number of years, and for each year, the rainfall (in inches)
  8.  * for each of the 12 months is entered. The program then calculates and displays
  9.  * the total number of months, the total inches of rainfall, and the average rainfall
  10.  * per month for the entire period.
  11.  * ________________________________________________________________________________________
  12.  *
  13.  * INPUT:
  14.  *   years          : number of years
  15.  *   rainfall       : monthly rainfall in inches
  16.  *
  17.  * OUTPUT:
  18.  *   totalMonths    : total number of months (years * 12)
  19.  *   totalRainfall  : total rainfall in inches for the period
  20.  *   averageRainfall: average rainfall per month
  21.  *
  22.  *******************************************************************************************/
  23.  
  24. #include <iostream>
  25. #include <iomanip>
  26. using namespace std;
  27.  
  28. int main()
  29. {
  30.     /***** VARIABLE DECLARATIONS *****/
  31.     int years;              // Number of years
  32.     int totalMonths;        // Total number of months
  33.     double rainfall;        // Rainfall for one month
  34.     double totalRainfall;   // Total rainfall for all months
  35.     double averageRainfall; // Average rainfall per month
  36.  
  37.     /***** INPUT SECTION *****/
  38.     cout << "Enter the number of years: ";
  39.     cin >> years;
  40.  
  41.     // Validate number of years (must be at least 1)
  42.     while (years < 1)
  43.     {
  44.         cout << "Invalid. Number of years must be at least 1. Try again: ";
  45.         cin >> years;
  46.     }
  47.  
  48.     totalRainfall = 0.0;
  49.     totalMonths = 0;
  50.  
  51.     /***** PROCESSING SECTION *****/
  52.     for (int year = 1; year <= years; year++)
  53.     {
  54.         cout << "\nYear " << year << endl;
  55.  
  56.         for (int month = 1; month <= 12; month++)
  57.         {
  58.             cout << "  Enter rainfall (in inches) for month " << month << ": ";
  59.             cin >> rainfall;
  60.  
  61.             // Validate rainfall (cannot be negative)
  62.             while (rainfall < 0)
  63.             {
  64.                 cout << "  Invalid. Rainfall cannot be negative. Try again: ";
  65.                 cin >> rainfall;
  66.             }
  67.  
  68.             totalRainfall += rainfall;
  69.             totalMonths++;
  70.         }
  71.     }
  72.  
  73.     averageRainfall = totalRainfall / totalMonths;
  74.  
  75.     /***** OUTPUT SECTION *****/
  76.     cout << fixed << setprecision(2);
  77.     cout << "\nNumber of months: " << totalMonths << endl;
  78.     cout << "Total inches of rainfall: " << totalRainfall << endl;
  79.     cout << "Average rainfall per month: " << averageRainfall << " inches" << endl;
  80.  
  81.     return 0;
  82. }
  83.  
Success #stdin #stdout 0.01s 5320KB
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Enter the number of years: 
Year 1
  Enter rainfall (in inches) for month 1:   Enter rainfall (in inches) for month 2:   Enter rainfall (in inches) for month 3:   Enter rainfall (in inches) for month 4:   Enter rainfall (in inches) for month 5:   Enter rainfall (in inches) for month 6:   Enter rainfall (in inches) for month 7:   Enter rainfall (in inches) for month 8:   Enter rainfall (in inches) for month 9:   Enter rainfall (in inches) for month 10:   Enter rainfall (in inches) for month 11:   Enter rainfall (in inches) for month 12: 
Year 2
  Enter rainfall (in inches) for month 1:   Enter rainfall (in inches) for month 2:   Enter rainfall (in inches) for month 3:   Enter rainfall (in inches) for month 4:   Enter rainfall (in inches) for month 5:   Enter rainfall (in inches) for month 6:   Enter rainfall (in inches) for month 7:   Enter rainfall (in inches) for month 8:   Enter rainfall (in inches) for month 9:   Enter rainfall (in inches) for month 10:   Enter rainfall (in inches) for month 11:   Enter rainfall (in inches) for month 12: 
Number of months: 24
Total inches of rainfall: 60.00
Average rainfall per month: 2.50 inches
https://ideone.com/Faw0h7
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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