C Programs

Share with a Friend

C Program: Convert Celsius to Fahrenheit

Introduction

Temperature conversion is a common real-world problem often solved using simple mathematical formulas in programming.

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

F=(9/5×C)+32

Where:

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

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

C Program: Convert Celsius to Fahrenheit

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

 
OUTPUT 1 :
Enter temperature in Celsius: 37
37.00 Celsius = 98.60 Fahrenheit

OUTPUT 2 :
Enter temperature in Celsius: 0
0.00 Celsius = 32.00 Fahrenheit

Explanation :

1. float celsius, fahrenheit;
   • Declares variables to store Celsius and Fahrenheit values.
   • float is used because temperature can have decimal values.
2. scanf("%f", &celsius);
   • Reads Celsius value from the user.
3. Conversion Formula
   • (celsius * 9 / 5) + 32 converts Celsius into Fahrenheit.
4. printf("%.2f Celsius = %.2f Fahrenheit\n", celsius, fahrenheit);
   • %.2f ensures the result is printed with two decimal places.
5. return 0;
   • Ends the program successfully.