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atan2 − arc tangent function of two variables |
#include <math.h> double atan2(double y, double x); |
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The atan2() function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result. |
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The atan2() function returns the result in radians, which is between -PI and PI (inclusive). |
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SVID 3, POSIX, BSD 4.3, ISO 9899 |
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acos(3), asin(3), atan(3), cos(3), sin(3), tan(3) |