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:
Round a Number
The ceil() function rounds a number of upwards to its nearest integer, and the floor() function rounds a number of downwards to its nearest integer, and returns the result:
Power
The pow() function returns the value of x to the power of y (xy):
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 |
| atan2(y, x) | Returns the arctangent of y/x |
| ceil(x) | Returns the smallest integer greater than or equal to x |
| cbrt(x) | Returns the cube root of x |
| cos(x) | Returns the cosine of x |
| cosh(x) | Returns the hyperbolic cosine of x |
| exp(x) | Returns the value of Ex (the exponential of the number x) |
| fabs(x) | Returns the absolute value of x |
| floor(x) | Returns the largest integer that is less than or equal to x |
| fmod(x, y) | Returns the remainder of dividing x by y |
| frexp(x, exp) | Decomposes the number x into whole and fractional parts |
| hypot(x, y) | Returns the hypotenuse of a right triangle with legs x and y |
| ldexp(x, exp) | Multiplies the number x by 2 to the power of exp |
| log(x) | Returns the natural logarithm of x |
| log10(x) | Returns the decimal logarithm of x |
| modf(x, ip) | Factors a number x into its integer and fractional parts and returns the fractional part |
| pow(x, y) | Returns x to the power of y |
| sin(x) | Returns the sine of x (x in radians) |
| sinh(x) | Returns the hyperbolic sine of x |
| sqrt(x) | Returns the square root of x |
| tan(x) | Returns the tangent of x |
| tanh(x) | Returns the hyperbolic tangent of x |
| trunc(x) | Returns the integer part of x |
All of these functions accept arguments of type double unless otherwise specified.
