In this tutorial, we will learn a writing program in C to calculate the square root of a given number. There is a predefined function sqrt() in C which we will use to find the square root of any number. This program is going to be very easy like the square program in c and the cube program in c.

Before writing the program let’s know about square root.

## What is square root?

Square root can be defined as **a factor of a number that, when multiplied by itself, gives the original number**.

For example

2 is a square root of 4. -2 is also a square root of 4.

because 2*2 = 4 and -2 * -2 = 4,

## How Square root program in C will behave?

- Program will take one positive integer as an input for which we will calculate square root.
- After taking integer as an input, we will pass this value to sqrt() method. And this method will result square root of that number.
- This Sqrt() method is defined in math.h header file of C.
- Let’s see the program for better understanding.

## C Program to calculate Square Root of a number

```
#include<stdio.h>
#include<math.h>
int main() {
int num;
double result;
printf("C Program to find square root \n");
printf("Enter a Number to find square root: ");
scanf("%d", & num);
result = sqrt(num);
printf("Square Root of %d is %.2f", num, result);
}
```

**Output**

```
C Program to find square root
Enter a Number to find square root: 25
Square Root of 25 is 5.00
```

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