C/math.h/ldexp

ldexp: returns the value of num * 2^exp

<source lang="cpp">

//Header file: #include <math.h> //Declaration: float ldexpf(float num, int exp);

              double ldexp(double num, int exp); 
              long double ldexpl(long double num, int exp);  

   
 
 #include <math.h>
 #include <stdio.h>
 int main(void)
 {
   printf("%f", ldexp(1,2));
   return 0;
 }
        

/* 4.000000*/

      </source>