Manpage of ISNAN

ISNAN

Section: NEWLIB (3)
Updated: 2005 Feb 23
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NAME

1.19 `isnan',`isnanf',`isinf',`isinff',`finite',`finitef'--test for exceptional numbers

SYNOPSIS

     #include <ieeefp.h>
     int isnan(double ARG);
     int isinf(double ARG);
     int finite(double ARG);
     int isnanf(float ARG);
     int isinff(float ARG);
     int finitef(float ARG);

DESCRIPTION

These functions provide information on the floating-point argument supplied.

There are five major number formats - `zero'
a number which contains all zero bits.

`subnormal'
Is used to represent number with a zero exponent, but a nonzero
fraction.

`normal'
A number with an exponent, and a fraction

`infinity'
A number with an all 1's exponent and a zero fraction.

`NAN'
A number with an all 1's exponent and a nonzero fraction.

`isnan' returns 1 if the argument is a nan. `isinf' returns 1 if the argument is infinity. `finite' returns 1 if the argument is zero, subnormal or normal. The `isnanf', `isinff' and `finitef' perform the same operations as their `isnan', `isinf' and `finite' counterparts, but on single-precision floating-point numbers.

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Time: 21:25:18 GMT, May 16, 2005

ISNAN

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO

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