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Standard C Library Functionsldexp(3C)


NAME

 ldexp - load exponent of a floating point number

SYNOPSIS

 
#include <math.h>
double ldexp(double x, int exp);

DESCRIPTION

 

The ldexp() function computes the quantity x* 2exp.

RETURN VALUES

 

Upon successful completion, ldexp() returns a double representing the value x multiplied by 2 raised to the power exp.

If the value of x is NaN, NaN is returned.

If ldexp() would cause overflow, +-HUGE_VAL is returned (according to the sign of x), and errno is set to ERANGE.

If ldexp() would cause underflow to 0.0, 0 is returned and errno may be set to ERANGE.

ERRORS

 

The ldexp() function will fail if:

ERANGE
The value to be returned would have caused overflow.

The ldexp() function may fail if:

ERANGE
The value to be returned would have caused underflow.

USAGE

 

An application wishing to check for error situations should set errno to 0 before calling ldexp(). If errno is non-zero on return, or the return value is NaN, an error has occurred.

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

frexp(3C), isnan(3M), attributes(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.