EXP(3M)                 COMMAND REFERENCE                 EXP(3M)



NAME
     exp, expm1, log, log1p, log2, log10, pow, sqrt -
     exponential, logarithm, power, and square root functions

SYNOPSIS
     #include <math.h>

     double exp (x)
     double x;

     double expm1 (x)
     double x;

     double log (x)
     double x;

     double log1p (x)
     double x;

     double log2 (x)
     double x;

     double log10 (x)
     double x;

     double pow (x, y)
     double x, y;

     double sqrt (x)
     double x;

DESCRIPTION
     Exp   returns the exponential function of x.

     Expm1 returns  exp (x) -1  accurately even for tiny x.

     Log   returns the natural logarithm of x;  log10 returns the
           base 10 logarithm of x.

     Log1p returns  log (1+x)  accurately even for tiny  x;  log2
           returns the logarithm of  x to base 2.  x;

     Pow   returns x to the power of y.

     Sqrt  returns the square root of x.

FILES
     /usr/lib/libm.a
                    Mathematical library functions.

DIAGNOSTICS
     Exp and pow are undefined when the correct value would



Printed 3/13/89                                                 1

EXP(3M)                 COMMAND REFERENCE                 EXP(3M)



     overflow; errno is set to ERANGE.  Pow returns 0 and sets
     errno to EDOM when the first argument is negative or zero
     and the second argument is negative and non-integral, for
     example, pow(-1.0,-0.5). The value of pow (0.0,0.0) is
     defined to be 1.0

     Log , log10 , log1p , and log2 are undefined when x is zero
     or negative; errno is set to EDOM.

     Sqrt is undefined when x is negative; errno is set to EDOM.

SEE ALSO
     intro(3m).










































Printed 3/13/89                                                 2

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