Write a C++ program to convert Fahrenheit into Celsius using the function

Write a C++ program to convert Fahrenheit into Celsius using the function

In this tutorial, we will discuss the concept of the Write a C++ program to convert Fahrenheit into Celsius using the function

In this post, we will learn how to write a program to convert Fahrenheit into Celsius using the scientific equation in C++ programming language with an Example program.

Temperature and conversion

Generally, We have known three types of temperature units Fahrenheit, Celsius, and Kelvin. In this article, we are discussing how to convert temperature units Fahrenheit into Celsius. Fahrenheit and Celsius are the measuring units in degrees as ⁰F and ⁰C  respectively.

Scientific equation Celsius = (Fahrenheit-32)*9/5

Program to convert Fahrenheit into Celsius

Convert Fahrenheit into Celsius

In this program, the user declares a double variable as a parameter for Fahrenheit in the user-defined function. When the user calls the function, the Celsius value passes to the function as an argument.
Finally, the Celsius value is calculated using a scientific equation and displayed on the screen.

Program 1

//C++ program to convert F into C using function
#include <iostream>
using namespace std;
float fahrenheitToCelsius(float);

int main() {
    float fahrenheit;
    // variable declaration
    //Calculate Fahrenheit
    float celsius=fahrenheitToCelsius(212.00);
    float celsius1=fahrenheitToCelsius(150.00);
    float celsius2=fahrenheitToCelsius(100.50);
    float celsius3=fahrenheitToCelsius(36.90);
    
    //display result on the screen
    //by calling the function
cout<<celsius <<" Celsius"<<endl;
cout<<celsius1 <<" Celsius"<<endl;
cout<<celsius2 <<" Celsius"<<endl;
cout<<celsius3 <<" Celsius"<<endl;
    return 0;
}
float fahrenheitToCelsius(float fahrenheit){
return ((fahrenheit-32) * 5/9);;
}

When the above code is executed, it produces the following result

100 Celsius
65.5556 Celsius
38.0556 Celsius
2.72222 Celsius

 

Convert Fahrenheit into Celsius – Entered by the user

In this program, the user declares a double variable as a parameter for Fahrenheit in the user-defined method. When the user runs the program (calling the method), the program is asked for the value for Fahrenheit and stores the given value in the variable fahrenheit as an argument for the function.
Finally, the Celsius value is calculated using scientific equations and displayed on the screen.

Program 2

//C++ program to convert F into C using function
#include <iostream>
using namespace std;
float fahrenheitToCelsius(float);

int main() {
    float fahrenheit;
    // variable declaration
    // ask input from the user
    cout<<"Enter the temperature in Fahrenheit:";
    cin>>fahrenheit;//reading the input
    //Calculate fahrenheit
    float celsius=fahrenheitToCelsius(fahrenheit);
  
    //display result on the screen
    //by call the function
cout<<fahrenheit <<" Fahrenheit"<<" equal to "<<celsius<<" celsius"<<endl;
    return 0;
}
float fahrenheitToCelsius(float fahrenheit){
return ((fahrenheit-32) * 5/9);;
}

When the above code is executed, it produces the following result

Enter the temperature in Fahrenheit:212.00
212 Fahrenheit equal to 100 celsius

 

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