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C Program: Convert Fahrenheit to Celsius

Introduction

Temperature conversion is one of the simplest yet practical problems in programming.

The formula to convert Fahrenheit (°F) to Celsius (°C) is:

C=((F−32)×5)/9

Where:

• F = Temperature in Fahrenheit
• C = Temperature in Celsius

In this program, we take input in Fahrenheit from the user and apply the above formula to display its equivalent in Celsius.

C Program: Convert Fahrenheit to Celsius

#include <stdio.h>   // Standard I/O header
 
int main() {
    float fahrenheit, celsius;
 
    // Input from user
    printf("Enter temperature in Fahrenheit: ");
    scanf("%f", &fahrenheit);
 
    // Conversion formula
    celsius = (fahrenheit - 32) * 5 / 9;
 
    // Output result
    printf("%.2f Fahrenheit = %.2f Celsius\n", fahrenheit, celsius);
 
    return 0; // Successful termination
}

 
OUTPUT 1 :
Enter temperature in Fahrenheit: 98.6
98.60 Fahrenheit = 37.00 Celsius

OUTPUT 2 :
Enter temperature in Fahrenheit: 32
32.00 Fahrenheit = 0.00 Celsius

Explanation :

1. float fahrenheit, celsius;
   • Declares two floating-point variables for storing temperatures.
2. scanf("%f", &fahrenheit);
   • Reads a Fahrenheit value from the user.
3. Conversion Formula
   • (fahrenheit - 32) * 5 / 9 converts Fahrenheit into Celsius.
4. printf("%.2f Fahrenheit = %.2f Celsius\n", fahrenheit, celsius);
   • Displays result with two decimal places using %.2f.
5. return 0;
   • Exits the program successfully.