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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Copy the sign of one floating-point value to another.

Header File

Defined in <SDL3/SDL_stdinc.h>


float SDL_copysignf(float x, float y);

Function Parameters

float x floating point value to use as the magnitude.
float y floating point value to use as the sign.

Return Value

(float) Returns the floating point value with the sign of y and the magnitude of x.


The definition of copysign is that copysign(x, y) = abs(x) * sign(y).

Domain: -INF <= x <= INF, -INF <= y <= f

Range: -INF <= z <= INF

This function operates on single-precision floating point values, use SDL_copysign for double-precision floats.

Thread Safety

It is safe to call this function from any thread.


This function is available since SDL 3.0.0.

See Also

CategoryAPI, CategoryAPIFunction, CategoryStdinc

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