C Program to Convert Celsius to Fahrenheit (with Example Code)

How to Convert Celsius to Fahrenheit in C

In this post, we’ll learn how to convert a temperature from Celsius to Fahrenheit using a simple C program. The conversion formula we’ll use is:

fahrenheit = (celsius × 9 / 5) + 32

C Program Code

#include <stdio.h>

int main() {
    float celsius, fahrenheit;

    // Prompt the user to enter the temperature in Celsius
    printf("Enter temperature in Celsius: ");
    scanf("%f", &celsius);

    // Convert Celsius to Fahrenheit
    fahrenheit = (celsius * 9 / 5) + 32;

    // Display the result
    printf("%.2f Celsius is equal to %.2f Fahrenheit\n", celsius, fahrenheit);

    return 0;
}

How the Program Works

  • We include the standard input/output library <stdio.h>.
  • We declare two float variables: celsius and fahrenheit.
  • We prompt the user to enter the Celsius temperature using printf() and read it with scanf().
  • We perform the conversion using the formula fahrenheit = (celsius × 9 / 5) + 32.
  • We display the converted temperature using printf() with two decimal precision.

Example Output

Here’s what the output might look like: 

Enter temperature in Celsius: 25
25.00 Celsius is equal to 77.00 Fahrenheit

Conclusion

This simple program illustrates how to convert a Celsius temperature to Fahrenheit in C. You can enhance this by adding error handling or expanding it to handle multiple conversions in a loop.

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