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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!)


Round x to the nearest integer representable as a long

Header File

Defined in <SDL3/SDL_stdinc.h>


long SDL_lround(double x);

Function Parameters

double x floating point value.

Return Value

(long) Returns the nearest integer to x.


Rounds x to the nearest integer. Values halfway between integers will be rounded away from zero.

Domain: -INF <= x <= INF

Range: MIN_LONG <= y <= MAX_LONG

This function operates on double-precision floating point values, use SDL_lround for single-precision floats. To get the result as a floating-point type, use SDL_round.

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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