C库函数 - ldexp()

#include <stdio.h>

#include <math.h>



int main () {

   double x, ret;

   int n;



   x = 0.65;

   n = 3;

   ret = ldexp(x ,n);

   printf("%f * 2^%d = %f\n", x, n, ret);



   return(0);

}