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Raises a number to a power

#include <math.h>
double pow ( double x , double y  );
float powf ( float x , float y  );         (C99)
long double powl ( long double x , long double y  );         (C99)

The pow( ) function calculates x to the power of y. In other words, the return value is xy. The arguments are subject to the following rules:

  • If x is negative, y must have an integer value.

  • If x is zero, then y must not be negative. (00 = 1.0, but for all other positive values of y, 0y = 0.0.)

If the arguments violate these conditions, pow( ) may return NaN (not a number) or infinity, and may indicate a domain error. If an overflow or underflow occurs, pow( ) returns positive or negative HUGE_VAL and may indicate a range error.


See the example for cosh( ) in this chapter.

See Also

exp( ), sqrt( ), cpow( )

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