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1.47 pow10, pow10f—base 10 power functions

Synopsis 

     #include <math.h>
     double pow10(double x);
     float pow10f(float x);

Description
pow10 and pow10f calculate 10 ^ x, that is, 10 raised to the power x.

You can use the (non-ANSI) function matherr to specify error handling for these functions.
Returns
On success, pow10 and pow10f return the calculated value. If the result underflows, the returned value is 0. If the result overflows, the returned value is HUGE_VAL. In either case, errno is set to ERANGE.
Portability
pow10 and pow10f are GNU extensions.