#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

void print_digit(int dig) {
   if (dig) {
       cout <<  "1";
   } else {
       cout <<  "0";
   }
}

void print_float(float x){
    int i,j,base;
    unsigned char * ch;
    int bc;

    ch = (unsigned char * )  &x;
    cout << setw(10) << x<< " ";

    bc = 0;
    for(j=3;j>=0;j--) {
      base=128;
      for (i=0;i<8;i++){
         print_digit(base & ch[j]);
	 base = base/2;
	 bc++;
	 if (bc == 1) { cout << " "; }
	 if (bc == 10) { cout << " "; }
      }
      bc++;
      if (bc == 10) { cout << " "; }
    }
    cout << endl;
}

int main () {
   float x;

   cout << " A float is "  << sizeof (x) << " bytes " << endl;

  for (x=-2;x<35;x+=1){
     print_float(x);
  }
  print_float(0.5);
  print_float(0.25);
  print_float(0.125);
  print_float(0.625);
  print_float(1.0/pow(2,128.0));
  print_float(1.0/pow(2,129.0));
  print_float(1.0/pow(2,130.0) + 1.0/pow(2,129.0) + 1.0/pow(2,128.0));
  print_float(1.0/2.0e-40);
  print_float(sqrt(-7.0));
}