Calculate x raised to the power of y.
#include <math.h>
double pow( double x, double y );
long double _powl( long double x, long double y );
| x | Number to be raised | |
| y | Power of x |
The pow and _powl functions compute x raised to the power of y.
The _powl function is the 80-bit counterpart, and it uses an 80-bit, 10-byte coprocessor form of arguments and return values. See the reference page on the long double functions for more details on this data type.
The pow and _powl functions return the value of xy. If x is not 0.0 and y is 0.0, pow and _powl return the value 1. If x is 0.0 and y is negative, pow and _powl set errno to EDOM and return 0.0. If both x and y are 0.0, or if x is negative and y is not an integer, the function prints a _DOMAIN error message to stderr, sets errno to EDOM, and returns 0.0. If an overflow results, the function sets errno to ERANGE and returns ±HUGE_VAL. No message is printed on overflow or underflow.
The pow function does not recognize integral floating-point values greater than 264, such as 1.0E100.
pow
Standards:ANSI, UNIX
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:DOS32X
_powl
Standards:None
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:None
/* POW.C */
#include <math.h>
#include <stdio.h>
void main( void )
{
double x = 2.0, y = 3.0, z;
z = pow( x, y );
printf( “%.1f to the power of %.1f is %.1f\n”, x, y, z );
}
2.0 to the power of 3.0 is 8.0