Simple C++ Problem?

Mack · 11-12-2006, 06:29 PM

The following is a very simple c++ program, that i believe should show the value of a variable x. since x = 1/3, i believe that the out put should be 0.3333, however, the output i get is x=0.
can anybody tell me why?

Code:

#include <iostream>
using namespace std;
int main()
{
 double x=10, dummy;
 
 x = (1/3);
 
 cout << "X : " << x << endl;
 cout << "Exit" << endl;
 cin >> dummy;
 return 0;
}

Addis · 11-12-2006, 05:55 PM

If you do

Code:

x = 1/3;

then it will interpret 1 and 3 as both integers, and put the result of the expression accordingly. To get it to display 0.333333 you need to change your code to

Code:

x = (1/3.0);

or alternatively

Code:

x = (1.0/3);

That way at least one of the values will be interpreted as floating point types, and so you'll get a floating point answer.

Mack · 11-12-2006, 06:26 PM

Thanks

11-12-2006, 06:29 PM	#1 (permalink) Top
Mack Big Geek Join Date: Feb 2004 Age: 26 Male Posts: 280 Status: Offline My Computer	Simple C++ Problem? The following is a very simple c++ program, that i believe should show the value of a variable x. since x = 1/3, i believe that the out put should be 0.3333, however, the output i get is x=0. can anybody tell me why? Code: #include <iostream> using namespace std; int main() { double x=10, dummy; x = (1/3); cout << "X : " << x << endl; cout << "Exit" << endl; cin >> dummy; return 0; }

11-12-2006, 05:55 PM	#2 (permalink) Top
Addis The King Join Date: Jan 2004 Age: 18 Male Posts: 5,255 Times Helpful: 403 My Mood: Drunk Status: Offline My Computer	If you do Code: x = 1/3; then it will interpret 1 and 3 as both integers, and put the result of the expression accordingly. To get it to display 0.333333 you need to change your code to Code: x = (1/3.0); or alternatively Code: x = (1.0/3); That way at least one of the values will be interpreted as floating point types, and so you'll get a floating point answer. __________________ Never trust a program you don't have the source code for. My website \| Powerful Desktop Linux \| Linux for human beings \| Linux for power users \| Linux for ricers

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11-12-2006, 06:26 PM	#3 (permalink) Top
Mack Big Geek Join Date: Feb 2004 Age: 26 Male Posts: 280 Status: Offline My Computer	Thanks

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