Thread: simple but not working

Alright, thanks for the code examples above.
I will be studying them and will use them once I know and test them better.

Below is the hardway in that it demonstrates the math and could be extended to other bases.

As always your comments are welcome.

Dave++

Code:

#include <iostream>
#include <stdio.h>
#include <string>
#include <cmath>
#include <cstdlib>

std::string DecToBin(float num)
{
  std::string str = "";
  int i, expmax;
  double top;
  const double lg2 = log(2.0);

  if(num == 0) return("0");

  expmax = floor(log(num)/lg2);
  //  std::cout <<"expmax " << expmax << std::endl;

  for(i=expmax; i>=0; i--){
    top = num - pow(2.0,i);    // subtract the binary basis
    //    std::cout << num << " " << top << std::endl;
    if (top < 0){
      str = str + "0";
    }
    else {
      str = str + "1";
    num = top;
    }
  }
  return(str);
}      

int main()
{
  int num;
  printf("Enter a whole number: ");
  scanf("&#37;i", &num);
  std::cout << DecToBin(num) << std::endl; 
  //  std::cout << log(2.0) << std::endl;
}

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