C++ Program to Convert Fahrenheit to Celsius

To convert fahrenheit to celsius, use a simple mathematical formula. In this article, we are going to discuss the conversion formula, a simple example, and an easy example code.

We have been given a temperature in fahrenheit and our task is to convert the given temperature into celsius using C++.

Understanding Fahrenheit to Celsius Formula

The formula for converting the given temperature from fahrenheit to celsius is as follows:

celsius = (fahrenheit - 32.0) * 5.0 / 9.0;

Let's see an example to convert the temperature given in fahrenheit to celsius using the above formula:

Input:
Temperature in Fahrenheit: 122.0deg

Solution:
celsius = (fahrenheit - 32.0) * 5.0 / 9.0;
celsius = (122.0 - 32.0) * 5.0 / 9.0 = 50deg

Output:
Temperature in Celsius: 50deg

Program to Convert Fahrenheit to Celsius

The following program demonstrates the conversion of temperature given in fahrenheit to celsius:

#include<iostream>
using namespace std;
int main() {
   float fahrenheit = 100, celsius;
   cout << "The tempertaure in Fahrenheit is: " << fahrenheit << endl;
   celsius = (fahrenheit - 32) * 5 / 9;
   cout << "Equivalent Celsius temperature is: " << celsius << endl;
}

Fahrenheit to Celsius Conversion Using Custom Function

In this example, we have used a custom function toCelsius() and passed fahrenheit as an argument. The function returns the celsius value after conversion.

#include<iostream>
using namespace std;

float toCelsius(float fahrenheit) {
    return (fahrenheit - 32) * 5 / 9;
}

int main() {
    float fahrenheit = 100.0;
    float celsius = toCelsius(fahrenheit);
    cout << "Temperature in Fahrenheit: " << fahrenheit << endl;
    cout << "Equivalent Celsius temperature is: " << celsius << endl;
}