# C Math Functions

## Math Functions

There is also a list of math functions available, that allows you to perform mathematical tasks on numbers.

To use them, you must include the `math.h` header file in your program:

#include <math.h>

## Square Root

To find the square root of a number, use the `sqrt()` function:

### Example

printf("%f", sqrt(16));
Try it Yourself »

## Round a Number

The `ceil()` function rounds a number upwards to its nearest integer, and the `floor()` method rounds a number downwards to its nearest integer, and returns the result:

### Example

printf("%f", ceil(1.4));
printf("%f", floor(1.4));
Try it Yourself »

## Power

The `pow()` function returns the value of x to the power of y (xy):

### Example

printf("%f", pow(4, 3));
Try it Yourself »

## Other Math Functions

A list of other popular math functions (from the `<math.h>` library) can be found in the table below:

Function Description
abs(x) Returns the absolute value of x
acos(x) Returns the arccosine of x
asin(x) Returns the arcsine of x
atan(x) Returns the arctangent of x
cbrt(x) Returns the cube root of x
cos(x) Returns the cosine of x
exp(x) Returns the value of Ex
sin(x) Returns the sine of x (x is in radians)
tan(x) Returns the tangent of an angle

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.