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ldexp

Compute a value from a mantissa and exponent.

Compatibility:

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

Prototype: 
#include <math.h>



double ldexp(double x, int exp);



float ldexpf(float, int);



long double ldexpl(long double, int);

Parameters:

 Parameters for this function are:



 






 x   





 double, float or long double   





 The value to compute   







 exp   





 int   





 Exponent   











Remarks:

 The ldexp() function computes x *2exp. This function can be used to construct a double value from the values returned by the frexp() function.

Return:

 ldexp() returns x * 2exp.

See Also:

 "frexp"



 "modf"

Example of Idexp() usage.:
#include <math.h>
#include <stdio.h>

int main(void)
{
	double value, x = 0.75;
	int e = 4;
	
	value = ldexp(x, e);

	printf("%f * 2 to the power of %d is %f.\n",x, e, value);

	return 0;
}

Output:
0.750000 * 2 to the power of 4 is 12.000000.






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Last updated: August 16, 2000