• C Program to Find Square root of a Number

    Welcome to a comprehensive guide on how to find the square root of a number using functions in the C programming language. If you are new to programming or want to enhance your knowledge, this blog post is the perfect resource for you.\

    In this blog, we will cover everything you need to know about finding the square root of a number using functions in C. We will start with a brief introduction to the concept of square root, followed by an explanation of how functions work in C. Then, we will dive into the implementation of the program step by step. So let’s get started!

    Introduction to Square Root

    The square root of a number is a value that, when multiplied by itself, gives the original number. For example, the square root of 25 is 5 since 5 multiplied by 5 equals 25. In mathematics, the symbol √ is used to represent the square root operation.

    In C programming, there is no built-in function to directly calculate the square root of a number. However, we can use the math.h header file to access the sqrt() function, which calculates the square root of a number. To use this function, we need to include the math.h header file in our C program.

    Introduction to Functions in C

    Before we dive into finding the square root of a number, let’s have a quick introduction to functions in C. A function is a block of code that performs a specific task. It takes input, performs some operations on it, and returns the output. Functions help in modularizing the code and make it more organized and reusable.

    In our program, we will define a function that takes an input number and returns its square root. This function will be called from the main() function, which is the entry point of our program.

    Implementing the Program

    Now that we have a basic understanding of square roots and functions in C, let’s implement the program to find the square root of a number using functions.

    #include <stdio.h>
    #include <math.h>
    // Function to calculate square root
    double squareRoot(double num) {
        return sqrt(num);
    int main() {
        double num, result;
        printf("Enter a number: ");
        scanf("%lf", &num);
        // Call the squareRoot function
        result = squareRoot(num);
        printf("Square root of %.2lf = %.2lf", num, result);
        return 0;

    Let’s break down the code to understand it better:

    1. We include the necessary header files, stdio.h and math.h, which provide the functions and data types we need for our program.

    2. We define a function named squareRoot that takes a double precision number as input and returns the square root of that number. Inside the function, we utilize the sqrt() function from the math.h library to calculate the square root.

    3. In the main() function, we declare two variables: num to store the input number and result to store the calculated square root.

    4. We prompt the user to enter a number using the printf() function and read the input using the scanf() function.

    5. Next, we call the squareRoot function, passing the input number as an argument and assigning the result to the result variable.

    6. Finally, we display the square root of the input number using the printf() function.

    That’s it! You have successfully implemented a C program to find the square root of a number using functions.

    Further Enhancements

    Now that you have a basic understanding of how to find the square root of a number in C, there are several ways you can further enhance the program:

    1. Add error handling: Currently, the program assumes that the user will enter a valid number. You can add error handling to handle cases where the user enters invalid input, such as non-numeric characters.

    2. Extend the program: You can modify the program to find the square root of multiple numbers at once. You can ask the user to enter the number of inputs and then loop through them to calculate their square roots.

    3. Implement your own square root function: If you want to challenge yourself, you can implement your own square root function without using the sqrt() function from the math.h library.

    These enhancements will not only improve your programming skills but also make your program more robust and versatile.


    This post explains finding square roots using functions in C programming, enhancing your numerical problem-solving skills effectively. We started with an introduction to square roots and functions and then implemented a C program step by step.

    Remember, functions are powerful tools in programming that help in organizing code and making it reusable. The sqrt() function from the math.h library played a crucial role in our program, allowing us to find the square root of a number efficiently.

     Keep practicing and exploring more possibilities with functions and other programming concepts. Happy coding!