C/math.h/ldexp

    
//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*/