pow - raises a number to a power
pow, powf, powl - power functions
#include <math.h>
double pow(double x, double y);
#include <math.h>
double pow(double x, double y);
float powf(float x, float y);
long double powl(long double x, long double y);Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
This function raises x to the power of y.
These functions return the value of x raised to the power of y.
This function returns, as a double, x raised to the power of y.
On success, these functions return the value of x to the power of y.
If x is a finite value less than 0, and y is a finite noninteger, a domain error occurs, and a NaN is returned.
If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with the mathematically correct sign.
If result underflows, and is not representable, a range error occurs, and 0.0 is returned.
Except as specified below, if x or y is a NaN, the result is a NaN.
If x is +1, the result is 1.0 (even if y is a NaN).
If y is 0, the result is 1.0 (even if x is a NaN).
If x is +0 (-0), and y is an odd integer greater than 0, the result is +0 (-0).
If x is 0, and y greater than 0 and not an odd integer, the result is +0.
If x is -1, and y is positive infinity or negative infinity, the result is 1.0.
If the absolute value of x is less than 1, and y is negative infinity, the result is positive infinity.
If the absolute value of x is greater than 1, and y is negative infinity, the result is +0.
If the absolute value of x is less than 1, and y is positive infinity, the result is +0.
If the absolute value of x is greater than 1, and y is positive infinity, the result is positive infinity.
If x is negative infinity, and y is an odd integer less than 0, the result is -0.
If x is negative infinity, and y less than 0 and not an odd integer, the result is +0.
If x is negative infinity, and y is an odd integer greater than 0, the result is negative infinity.
If x is negative infinity, and y greater than 0 and not an odd integer, the result is positive infinity.
If x is positive infinity, and y less than 0, the result is +0.
If x is positive infinity, and y greater than 0, the result is positive infinity.
If x is +0 or -0, and y is an odd integer less than 0, a pole error occurs and HUGE_VAL, HUGE_VALF, or HUGE_VALL, is returned, with the same sign as x.
If x is +0 or -0, and y is less than 0 and not an odd integer, a pole error occurs and +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, is returned.
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("A 32-bit integer can store %li possible values.\n", (long) pow(2, 32));
}