C# Examples
Dave Braunschweig
Temperature
// This program asks the user to select Fahrenheit or Celsius conversion // and input a given temperature. Then the program converts the given // temperature and displays the result. // // References: // https://www.mathsisfun.com/temperature-conversion.html // https://en.wikibooks.org/wiki/C_Sharp_Programming using System; public class MainClass { public static void Main(String[] args) { // main could either be an if-else structure or a switch-case structure string choice; double temperature; double result; Console.WriteLine("Enter F to convert to Fahrenheit or C to convert to Celsius:"); choice = Console.ReadLine(); // if-else approach if (choice == "C" || choice == "c") { temperature = GetTemperature("Fahrenheit"); result = CalculateCelsius(temperature); DisplayResult(temperature, "Fahrenheit", result, "Celsius"); } else if (choice == "F" || choice == "f") { temperature = GetTemperature("Celsius"); result = CalculateFahrenheit(temperature); DisplayResult(temperature, "Celsius", result, "Fahrenheit"); } else { Console.WriteLine("You must enter C to convert to Celsius or F to convert to Fahrenheit!"); } // switch-case approach switch(choice) { case "C": case "c": temperature = GetTemperature("Fahrenheit"); result = CalculateCelsius(temperature); DisplayResult(temperature, "Fahrenheit", result, "Celsius"); break; case "F": case "f": temperature = GetTemperature("Celsius"); result = CalculateFahrenheit(temperature); DisplayResult(temperature, "Celsius", result, "Fahrenheit"); break; default: Console.WriteLine("You must enter C to convert to Celsius or F to convert to Fahrenheit!"); break; } } private static double GetTemperature(string label) { string input; double temperature; Console.WriteLine("Enter " + label + " temperature:"); input = Console.ReadLine(); temperature = Convert.ToDouble(input); return temperature; } private static double CalculateCelsius(double fahrenheit) { double celsius; celsius = (fahrenheit - 32) * 5 / 9; return celsius; } private static double CalculateFahrenheit(double celsius) { double fahrenheit; fahrenheit = celsius * 9 / 5 + 32; return fahrenheit; } private static void DisplayResult(double fahrenheit, string fromLabel, double celsius, string toLabel) { Console.WriteLine(fahrenheit.ToString() + "° " + fromLabel + " is " + celsius.ToString() + "° " + toLabel); } }
Output
Enter C to convert to Celsius or F to convert to Fahrenheit: c Enter Fahrenheit temperature: 100 100° Fahrenheit is 37.7777777777778° Celsius Enter C to convert to Celsius or F to convert to Fahrenheit: f Enter Celsius temperature: 100 100° Celsius is 212° Fahrenheit Enter C to convert to Celsius or F to convert to Fahrenheit: x You must enter C to convert to Celsius or F to convert to Fahrenheit.