Section : 3 Updated : 2023-02-05 Source : Linux man-pages 6.03 NAMEatan2, atan2f, atan2l − arc tangent function of two variables LIBRARYMath library (libm, −lm)SYNOPSIS#include <math.h>double atan2(double y, double x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)):atan2f(),atan2l(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEDESCRIPTIONThese functions calculate the principal value of the arc tangent of y/x, using the signs of the two arguments to determine the quadrant of the result. RETURN VALUEOn success, these functions return the principal value of the arc tangent of y/x in radians; the return value is in the range [−pi, pi]. If y is +0 (−0) and x is less than 0, +pi (−pi) is returned. If y is +0 (−0) and x is greater than 0, +0 (−0) is returned. If y is less than 0 and x is +0 or −0, −pi/2 is returned. If y is greater than 0 and x is +0 or −0, pi/2 is returned. If either x or y is NaN, a NaN is returned. If y is +0 (−0) and x is −0, +pi (−pi) is returned. If y is +0 (−0) and x is +0, +0 (−0) is returned. If y is a finite value greater (less) than 0, and x is negative infinity, +pi (−pi) is returned. If y is a finite value greater (less) than 0, and x is positive infinity, +0 (−0) is returned. If y is positive infinity (negative infinity), and x is finite, pi/2 (−pi/2) is returned. If y is positive infinity (negative infinity) and x is negative infinity, +3*pi/4 (−3*pi/4) is returned. If y is positive infinity (negative infinity) and x is positive infinity, +pi/4 (−pi/4) is returned. ERRORSNo errors occur. ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD. SEE ALSOacos(3),asin(3),atan(3),carg(3),cos(3),sin(3),tan(3)0 Johanes Gumabo Data Size : 11,626 byte man-atan2l.3Build : 2025-03-22, 13:26 : Visitor Screen : x Visitor Counter ( page / site ) : 33 / 2,230,640 Visitor ID : : Visitor IP : 216.73.216.247 : Visitor Provider : AMAZON-02 : Provider Position ( lat x lon ) : 39.962500 x -83.006100 : x Provider Accuracy Radius ( km ) : 20 : Provider City : Columbus : Provider Province : Ohio , : , Provider Country : United States : Provider Continent : North America : Visitor Recorder : Version : Visitor Recorder : Library : Online Linux Manual Page : Version : Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 25.03.22 Online Linux Manual Page : Library : lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Online Linux Manual Page : Library : lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Data Base : Version : Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38 Data Base : Library : lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
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