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isfinite

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< c‎ | numeric‎ | math
Revision as of 05:31, 2 April 2014 by Newatthis (Talk | contribs)

 
 
 
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Classification
isfinite
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Macro constants
 
Defined in header <math.h>
#define isfinite(arg) /* implementation defined */
(since C99)

Determines if the given floating point number arg has finite value i.e. it is normal, subnormal or zero, but not infinite or NAN. The macro returns an integral value.

Contents

Parameters

arg - floating point value

Return value

Nonzero integral value if arg has finite value, 0 otherwise.

Example

#include <stdio.h>
#include <math.h>
#include <float.h>
 
int main()
{
    printf("isfinite(NAN)         = %d\n", isfinite(NAN));
    printf("isfinite(INFINITY)    = %d\n", isfinite(INFINITY));
    printf("isfinite(0.0)         = %d\n", isfinite(0.0));
    printf("isfinite(DBL_MIN/2.0) = %d\n", isfinite(DBL_MIN/2.0));
    printf("isfinite(1.0)         = %d\n", isfinite(1.0));
 
    return 0;
}

Possible output:

isfinite(NAN)         = 0
isfinite(INFINITY)    = 0
isfinite(0.0)         = 1
isfinite(DBL_MIN/2.0) = 1
isfinite(1.0)         = 1

See also

classifies the given floating-point value
(function) [edit]
(C99)
checks if the given number is infinite
(function) [edit]
(C99)
checks if the given number is NaN
(function) [edit]
checks if the given number is normal
(function) [edit]
C++ documentation for isfinite