ldexp

NAME

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

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

I float ldexpf(float  x , int  exp );

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

Link with -lm.

The R ldexp () function returns the result of multiplying the floating-point number x by 2 raised to the power R exp .

SVr4, 4.3BSD, C89. The float and long double variants are C99 requirements.