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LDEXP(3) Library Functions Manual LDEXP(3)

ldexp, ldexpf, ldexpl
multiply floating-point number by integral power of 2

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

The ldexp() function multiplies a floating-point number by an integral power of 2. The ldexpf() function is a single precision version of ldexp(). The ldexpl() function is an extended precision version of ldexp().

The ldexp(), ldexpf() and ldexpl() functions return the value of x times 2 raised to the power exp.
If the resultant value would cause an overflow, the global variable errno is set to ERANGE and the value HUGE is returned.

frexp(3), modf(3)

The ldexp() function conforms to ANSI X3.159-1989 (“ANSI C89”).
June 5, 2013 OpenBSD-current