ref: 8188b4f4f0e07b6669e6ae3c6c1099af917eaab4
dir: /sys/src/libc/test/powtest.c/
#include <u.h> #include <libc.h> /* We try to match the results specified by posix */ void main(void) { /* * For any value of y (including NaN), * if x is +1, 1.0 shall be returned. */ assert(pow(1.0, 132234.3) == 1.0); assert(pow(1.0, NaN()) == 1.0); /* * For any value of x (including NaN), * if y is ±0, 1.0 shall be returned. */ assert(pow(10213.7, 0.0) == 1.0); assert(pow(NaN(), 0.0) == 1.0); /* * If x or y is a NaN, a NaN shall be returned (unless * specified elsewhere in this description). */ assert(isNaN(pow(NaN(), NaN()))); assert(isNaN(pow(NaN(), 42.42))); assert(isNaN(pow(42.42, NaN()))); /* * For any odd integer value of y > 0, * if x is ±0, ±0 shall be returned. */ assert(pow(0.0, 1.0) == 0.0); assert(pow(0.0, 39.0) == 0.0); assert(pow(-0.0, 1.0) == -0.0); /* * For y > 0 and not an odd integer, * if x is ±0, +0 shall be returned. */ assert(pow(0.0, 2.0) == 0.0); assert(pow(0.0, 34.0) == 0.0); assert(pow(-0.0, 22.0) == 0.0); /* If x is -1, and y is ±Inf, 1.0 shall be returned. */ assert(pow(-1.0, Inf(1)) == 1.0); /* For |x| < 1, if y is -Inf, +Inf shall be returned. */ assert(isInf(pow(0.9, Inf(-1)), 1)); /* For |x| > 1, if y is -Inf, +0 shall be returned. */ assert(pow(1.1, Inf(-1)) == 0); /* For |x| < 1, if y is +Inf, +0 shall be returned. */ assert(pow(0.9, Inf(1)) == 0.0); /* For |x| > 1, if y is +Inf, +Inf shall be returned. */ assert(isInf(pow(1.1, Inf(1)), 1)); /* For y an odd integer < 0, if x is -Inf, -0 shall be returned. */ assert(pow(-7, Inf(-1)) == -0.0); /* For y < 0 and not an odd integer, if x is -Inf, +0 shall be returned. */ assert(pow(Inf(-1), -0.3) == 0); /* For y an odd integer > 0, if x is -Inf, -Inf shall be returned. */ assert(isInf(pow(Inf(-1), 7), -1)); /* For y > 0 and not an odd integer, if x is -Inf, +Inf shall be returned. */ assert(isInf(pow(Inf(-1), 19123.25324), 1)); /* For y < 0, if x is +Inf, +0 shall be returned. */ assert(pow(Inf(1), -1.3) == 0.0); /* For y > 0, if x is +Inf, +Inf shall be returned. */ assert(isInf(pow(Inf(1), 1.7), 1)); exits(nil); }