The **`sqrt()`** function in C returns the square root of a number. 
>You must import the `<math.h>` library to use `sqrt()`. 
# 
## Syntax


```
double sqrt(double x)
```

## Parameters
* `x`: A floating point value, e.g., 4.0, 5.0, 20.6, etc.

## Return value
`sqrt()` returns the square root of `x`.

## Example
In the example below, we use the `sqrt()` function to find the square root of some numbers.

#include <stdio.h>

// include the math libarary so as to use sqrt() method
#include <math.h>

// main function
int main () {

   // Print square root of some values
   printf("Square root of %lg is %lg\n", 4.0, sqrt(4) );
   printf("Square root of %lg is %lg\n", 16.0, sqrt(16.0) );
   printf("Square root of %lg is %lg\n", 3.3, sqrt(3.3) );
   
   return(0);
}

What is sqrt() in C?

Returns the square root of a number in C. Requires <math.h>. Syntax: double sqrt(double x).