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ldexp, ldexpl

Header File

math.h

Category

Math Routines

Prototype

double ldexp(double x, int exp);

long double ldexpl(long double x, int exp);

Description

Calculates x * 2^exp.

lexpl is the long double version; it takes a long double argument for x and returns a long double result.

Return Value

On success, ldexp (or ldexpl) returns the value it calculated, x * 2^exp. Error handling for these routines can be modified through the functions _matherr and _matherrl.

Example

Copy Code

    #include <stdio.h>
    #include <math.h>
    int main(void)
    {
        double value;
        double x = 2;
        /* ldexp raises 2 by a power of 3
           then multiplies the result by 2   */
        value = ldexp(x,3);
        printf("The ldexp value is: %lf\n", value);
        return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
ldexp | + | + | + | +
ldexpl |  | + | + | +

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