Specifies that variables of type bool appear as true or false in the stream.
ios_base& boolalpha(
ios_base& _Str
);
Parameters
- _Str
A reference to an object of type ios_base, or to a type that inherits from ios_base.
Return Value
A reference to the object from which _Str is derived.
Remarks
By default, variables of type bool are displayed as 1 or 0.
boolalpha effectively calls _Str.setf(ios_base::boolalpha), and then returns _Str.
noboolalpha reverses the effect of boolalpha.
Example
// ios_boolalpha.cpp
// compile with: /EHsc
#include <iostream>
int main( )
{
using namespace std;
bool b = true;
cout << b << endl;
boolalpha( cout );
cout << b << endl;
noboolalpha( cout );
cout << b << endl;
cout << boolalpha << b << endl;
}
1 true 1 true
Requirements
Header: <ios>
Namespace: std