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#include <math.h>| double | pow (double x, double y) |
| long | powl (long double x, long double y) |
| float | powf (float x, float y) |
#include <complex.h>
| double complex | cpow (double complex x, complex double y) |
| float complex | cpowf (float complex x, complex float y) |
| long double complex | cpowl (long double complex x, complex long double y) |
Description
The pow functions compute x raised to the power of y, i.e.
Example:
Example - Power function
Workings
#include <math.h> #include <stdio.h> int main(void) { for(int i = 1; i < 5; i++) printf("pow(3.2, %d) = %lf\n", i, pow(3.2, i)); return 0; }
Solution
Output:
pow(3.2, 1) = 3.200000 pow(3.2, 2) = 10.240000 pow(3.2, 3) = 32.768000 pow(3.2, 4) = 104.857600
Special Values
pow ( ±0, y ) returns ±∞ and raises the divide-by-zero floating-point exception for y an odd integer. pow ( ±0, y ) returns +∞ and raises the divide-by-zero floating-point exception for y < 0 and not an odd integer. pow ( ±0, y ) returns ±0 for y an odd integer > 0. pow ( ±0, y ) returns +0 for y > 0 and not an odd integer. pow ( -1, ±∞ ) returns 1. pow ( 1, y ) returns 1 for any y, even a NaN. pow ( x, ±0 ) returns 1 for any x, even a NaN. pow ( x, y ) returns a NaN and raises the invalid floating-point exception for finite x < 0 and finite non-integer y. pow ( x, -∞ ) returns +∞ for |x| < 1. pow ( x, -∞ ) returns +0 for |x| > 1. pow ( x, +∞ ) returns +0 for |x| < 1. pow ( x, +∞ ) returns +∞ for |x| > 1. pow ( -∞, y ) returns -0 for y an odd integer < 0. pow ( -∞, y ) returns +0 for y < 0 and not an odd integer. pow ( -∞, y ) returns -∞ for y an odd integer > 0. pow ( -∞, y ) returns +∞ for y > 0 and not an odd integer. pow ( +∞, y ) returns +0 for y < 0. pow ( +∞, y ) returns +∞ for y > 0. A domain error occurs if x is finite and negative and y is finite and not an integer. A domain error can occur if x is 0 and y less than or equal to 0.
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