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  1. // Chapter 4 - Programming Challenge #20
  2. // Freezing and Boiling Points
  3. // This program asks the user to enter a temperature
  4. // in degrees Fahrenheit. It then determines which
  5. // substances will freeze and which substances will
  6. // boil at that temperature.
  7.  
  8. #include <iostream>
  9. using namespace std;
  10.  
  11. int main()
  12. {
  13.     // Constants for the freezing points of each substance
  14.     const double ETHYL_FREEZING = -173;
  15.     const double MERCURY_FREEZING = -38;
  16.     const double OXYGEN_FREEZING = -362;
  17.     const double WATER_FREEZING = 32;
  18.  
  19.     // Constants for the boiling points of each substance
  20.     const double ETHYL_BOILING = 172;
  21.     const double MERCURY_BOILING = 676;
  22.     const double OXYGEN_BOILING = -306;
  23.     const double WATER_BOILING = 212;
  24.  
  25.     // Variable to store the temperature entered by the user
  26.     double temperature;
  27.  
  28.     // Get the temperature from the user
  29.     cout << "Enter a temperature in degrees Fahrenheit: ";
  30.     cin >> temperature;
  31.  
  32.     // Check which substances will freeze at this temperature.
  33.     // A substance will freeze if the temperature is at or
  34.     // below its freezing point.
  35.     if (temperature <= ETHYL_FREEZING)
  36.     {
  37.         cout << "Ethyl alcohol will freeze." << endl;
  38.     }
  39.  
  40.     if (temperature <= MERCURY_FREEZING)
  41.     {
  42.         cout << "Mercury will freeze." << endl;
  43.     }
  44.  
  45.     if (temperature <= OXYGEN_FREEZING)
  46.     {
  47.         cout << "Oxygen will freeze." << endl;
  48.     }
  49.  
  50.     if (temperature <= WATER_FREEZING)
  51.     {
  52.         cout << "Water will freeze." << endl;
  53.     }
  54.  
  55.     // Check which substances will boil at this temperature.
  56.     // A substance will boil if the temperature is at or
  57.     // above its boiling point.
  58.     if (temperature >= ETHYL_BOILING)
  59.     {
  60.         cout << "Ethyl alcohol will boil." << endl;
  61.     }
  62.  
  63.     if (temperature >= MERCURY_BOILING)
  64.     {
  65.         cout << "Mercury will boil." << endl;
  66.     }
  67.  
  68.     if (temperature >= OXYGEN_BOILING)
  69.     {
  70.         cout << "Oxygen will boil." << endl;
  71.     }
  72.  
  73.     if (temperature >= WATER_BOILING)
  74.     {
  75.         cout << "Water will boil." << endl;
  76.     }
  77.  
  78.     return 0;
  79. }
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
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Enter a temperature in degrees Fahrenheit: Water will freeze.
Oxygen will boil.
https://ideone.com/O4QdRn
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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