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Calculate Fahrenheit to Celsius

Temperature conversion program

This program converts temperature from Fahrenheit to Celsius by applying the conversion formula. For example, 82°F is equal to 27.7°C.

📐 Formula to Convert Fahrenheit to Celsius

T(°C) = (T(°F) - 32) × 5/9

T(°C): Temperature in Celsius

T(°F): Temperature in Fahrenheit

📋 Algorithm

Define temperature in Fahrenheit units
Apply the formula to convert Fahrenheit to Celsius
Print the temperature in Celsius

Program to Convert Fahrenheit to Celsius

fahrenheit_to_celsius.c

1// C Program to convert
2// Fahrenheit to Celsius
3#include <stdio.h>
4
5// Function to convert Degree
6// Fahrenheit to Degree Celsius
7float fahrenheit_to_celsius(float f)
8{
9    return ((f - 32.0) * 5.0 / 9.0);
10}
11
12// Driver code
13int main()
14{
15    float f = 40;
16
17    // Passing parameter to function
18    printf("Temperature in Degree Celsius : %0.2f",
19           fahrenheit_to_celsius(f));
20    return 0;
21}

Output

Temperature in Degree Celsius : 4.44

Program with User Input

fahrenheit_celsius_input.c

1#include <stdio.h>
2
3int main()
4{
5    float fahrenheit, celsius;
6    
7    // Get temperature in Fahrenheit from user
8    printf("Enter temperature in Fahrenheit: ");
9    scanf("%f", &fahrenheit);
10    
11    // Convert to Celsius using formula
12    celsius = (fahrenheit - 32) * 5.0 / 9.0;
13    
14    // Display the result
15    printf("%.2f°F = %.2f°C\n", fahrenheit, celsius);
16    
17    return 0;
18}

$ ./fahrenheit_celsius

Enter temperature in Fahrenheit: 98.6\n98.60°F = 37.00°C

📖 Code Explanation

Code	Explanation
float f = 40;	Declare and initialize Fahrenheit temperature
(f - 32.0)	Subtract 32 from Fahrenheit value
* 5.0 / 9.0	Multiply by 5/9 to get Celsius
%0.2f	Format specifier for 2 decimal places
5.0 / 9.0	Use float division (not 5/9 which gives 0)