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Tip of the Day
Language: C++
Expertise: All
Dec 9, 1998

Viewing bool Variables as Literals

By default, iostream objects display bool variables as 0 and 1. You can override the default setting by inserting the formatting flag boolalpha to the object stream. Consequently, the symbolic representations 'false' and 'true' will be displayed instead:
 
#include <iostream>
using namespace std;

void main() 
{    
 bool b = true;
 cout<<b;  // default setting; output 1
 cout<<boolalpha;  // henceforth, display 'true' and 'false' instead of 1 and 0
 cout<<b;   // output true
 cout<<!b;   // output false
}
Danny Kalev
 
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