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Engineering LibreTexts

3.11: C++ Examples

  • Page ID
    10630
  • Temperature

    // This program asks the user for a Fahrenheit temperature, 
    // converts the given temperature to Celsius,
    // and displays the results.
    //
    // References:
    // https://www.mathsisfun.com/temperature-conversion.html
    // https://en.wikibooks.org/wiki/C%2B%2B_Programming
    
    #include <iostream>
    
    using namespace std;
    
    double getFahrenheit();
    double calculateCelsius(double);
    void displayResult(double, double);
    
    int main() {
        double fahrenheit;
        double celsius;
        
        fahrenheit = getFahrenheit();
        celsius = calculateCelsius(fahrenheit);
        displayResult(fahrenheit, celsius);
        
        return 0;
    }
    
    double getFahrenheit() {
        double fahrenheit;
        
        cout << "Enter Fahrenheit temperature:" << endl; 
        cin >> fahrenheit;
        
        return fahrenheit;
    }
    
    double calculateCelsius(double fahrenheit) {
        double celsius;
        
        celsius = (fahrenheit - 32) * 5 / 9;
        
        return celsius;
    }
    
    void displayResult(double fahrenheit, double celsius) {
        cout << fahrenheit << "° Fahrenheit is " 
            << celsius << "° Celsius" << endl;
    }
    

    Output

    Enter Fahrenheit temperature:
     100
    100° Fahrenheit is 37.7778° Celsius