Ad:

C++ Discussion Thread
Unsolved
Views: 2519

Feb 18th, 2005

Drop 0 in floating point variable 0.233

Expand Post »

I'm using visual studio .net c++ and I'm looking for the easiest code to drop the 0 on 0.233 to .233 when displaying floating point variable on screen. Thanks.

Similar Threads

a simple way to print a binary representation of a floating point number? in C++
Floating Decimal Variable? in Python
floating point/character in C
More precise floating point arithmetic in C++
Matlab - Is this a floating point arithmetic problem? in Computer Science

dallin

Reputation Points: 11

Solved Threads: 0

Newbie Poster

Offline

14 posts
since Jan 2005

Permalink

Feb 18th, 2005

Re: Drop 0 in floating point variable 0.233

My first question is: why bother? Unless there's a trick that's slipped my mind, you need to copy the value into a string and then remove the first character:

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <sstream>
 
using namespace std;
 
int main()
{
  double f = 0.123;
  ostringstream sout;
 
  sout<< f;
  string s = sout.str();
  cout<< s.substr(1, s.length()) <<endl;
}
#include <iostream>
#include <sstream>

using namespace std;

int main()
{
  double f = 0.123;
  ostringstream sout;

  sout<< f;
  string s = sout.str();
  cout<< s.substr(1, s.length()) <<endl;
}

That's hardly worth the effort for something so small as removing a 0 for no apparent benefit.

Narue

Administrator

Reputation Points: 6442

Solved Threads: 1393

Bad Cop

Offline

11,807 posts
since Sep 2004

Permalink

Feb 19th, 2005

Re: Drop 0 in floating point variable 0.233

I agree, however, I believe its for my educational benefit only and my grade. I've tried it and like it, however, what additional code do I need to limit the digits displayed to 3? Found it, I think I'm taking care of. Thanks!

dallin

Reputation Points: 11

Solved Threads: 0

Newbie Poster

Offline

14 posts
since Jan 2005

Permalink

Feb 19th, 2005

Re: Drop 0 in floating point variable 0.233

For the benifits of others:

You must include <iomanip> to use this manipulator.

C++ Syntax (Toggle Plain Text)
 
// setprecision example
#include <iostream>
#include <iomanip>
using namespace std;
int main () { 
double f =3.14159; cout << setprecision (5) << f << endl; 
cout << setprecision (9) << f << endl; 
return 0;
}
 
// setprecision example
#include <iostream>
#include <iomanip>
using namespace std;
int main () { 
double f =3.14159; cout << setprecision (5) << f << endl; 
cout << setprecision (9) << f << endl; 
return 0;
}

BountyX

Reputation Points: 28

Solved Threads: 9

Posting Whiz in Training

Offline

222 posts
since Mar 2004

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

Previous Thread in C++ Forum Timeline: Programming Class Help!

Next Thread in C++ Forum Timeline: I need a solution for a opengl thing

DaniWeb Message

Cancel Changes

User Name
Password