In this article, you will learn a C++ program for temperature conversion. The user can select and enter any of the temperatures from Celsius, Fahrenheit, or Kelvin and the program displays its corresponding temperatures on the console screen.
Formula
Here are the formulas for temperature conversion.
| Celsius to Fahrenheit | ° F = 9/5 ( ° C) + 32 |
| Celsius to Kelvin | K = ° C + 273 |
| Fahrenheit to Celsius | ° C = 5/9 (° F – 32) |
| Fahrenheit to Kelvin | K = 5/9 (° F – 32) + 273 |
| Kelvin to Celsius | ° C = K – 273 |
| Kelvin to Fahrenheit | ° F = 9/5 (K – 273) + 32 |
Example: Temperature conversion in C++
#include<iostream>
using namespace std;
int main()
{
float fahr, cel, kel;
char option;
cout << "Choose One Option:" << endl;
cout << "1: For Celsius" << endl;
cout << "2: For Fahrenheit" << endl;
cout << "3: For Kelvin" << endl;
cin >> option;
if (option == '1')
{
cout << "Enter the temperature in Celsius: ";
cin >> cel;
fahr = (1.8 * cel) + 32.0;
kel = cel + 273;
cout << "\nTemperature in Fahrenheit: " << fahr << " F" << endl;
cout << "\nTemperature in Kelvin: " << kel << " K" << endl;
}
else if (option == '2')
{
cout << "Enter the temperature in Fahrenheit: ";
cin >> fahr;
cel = (fahr - 32) / 1.8;
kel = 0.55 * (fahr - 32) + 273;
cout << "\nTemperature in Celsius: " << cel << " C" << endl;
cout << "\nTemperature in Kelvin: " << kel << " K" << endl;
}
else if (option == '3')
{
cout << "Enter the temperature in Kelvin: ";
cin >> fahr;
cel = kel - 273;
fahr = 1.8 * (kel - 273) + 32;
cout << "\nTemperature in Celsius: " << cel << " C" << endl;
cout << "\nTemperature in Fahrenheit: " << fahr << " F" << endl;
}
else
cout << "Wrong Input." << endl;
return 0;
}Output
