(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)

SDL_acos

Use this function to compute arc cosine of x.

Header File

Defined in SDL_stdinc.h

Syntax

double SDL_acos(double x);

Function Parameters

x floating point value, in radians.

Return Value

Returns arc cosine of x.

Remarks

The definition of y = acos(x) is x = cos(y).

Domain: -1 <= x <= 1

Range: 0 <= y <= Pi

Version

This function is available since SDL 2.0.2.

CategoryAPI, CategoryAPIFunction, CategoryStdInc