Program to convert Fahrenheit to Celsius

Approach

The approach to this problem is straightforward:

1. We will first take the input in the form of float value from the user, and then we will pass that input to the formula stated above.
2. We will store the result of the formula in another float variable. 
3. After that, we will print that output.

Implementation in C++

// C Program to Convert Fahrenheit to Celsius
#include <stdio.h>

int main() {
    float Fahrenheit, Celsius;
  
    scanf("%f", &Fahrenheit);

    /* Formula for conversion from Fahrenheit to Celsius */
    Celsius = (5*(Fahrenheit - 32)) / 9;

    printf("\n%0.2f degree in Fahrenheit is equal to %0.2f degree in Celsius\n", Fahrenheit, Celsius);
    return 0;
}

You can also try this code with Online C Compiler

Run Code

Output:

Input: Fahrenheit = 38

Output: 38.00 degrees in Fahrenheit is equal to 3.33 degrees in Celsius

Complexity Analysis

Time Complexity: O(1)

Since we are not using any loop and there are no iterations, we are doing a constant amount of work to get the answer; the time complexity is O(1).

Space Complexity: O(1)

Also see, Tribonacci Series and Short int in C Programming

Frequently Asked Questions

Why is C called a mid-level programming language?

C is a mid-level programming language because it bridges low-level and high-level computer languages. We may utilize the C language as a System programming language to create the operating system and an Application programming language to create a menu-driven customer-driven billing system. 

What is a built-in function in C?

Built functions, also known as the library functions, are supplied by the system to make a developer's life easier by supporting them in some commonly used predetermined activities. In C, for example, if we nee d to send the output of our program to the terminal, we would use print(). Some of the most widely used built-in functions of C are scanf(), printf(), strcpy, strcmp, strlen, strcat, and many more.

What are header files, and what are their uses in C?

In C, header files have the extension .h, these header files include function definitions, data type definitions, macros, and so on. The header is used to import the above definitions into the source code, this is done by using #include before the header.  For example, if your source code requires taking input from the user, doing some modification, and printing the output on the terminal, it should include the stdio.h file as #include <stdio.h>, which allows the user to take input using scanf(), and to perform some manipulations, and after that print using printf().

Conclusion

In this article, we discussed the problem of converting Fahrenheit to Celsius. We have discussed the solution to this problem and coded the solution in C language. We have also discussed the time complexity of the approach.