C++ ios Library - Boolalpha Function

By Md Shoriful Islam

 C++ ios Library - Boolalpha Function

Description

It is used to sets the boolalpha format flag for the str stream. When the boolalpha format flag is set, bool values are inserted/extracted by their textual representation: either true or false, instead of integral values.


Declaration

Following is the declaration for std::boolalpha function.


ios_base& boolalpha (ios_base& str);

Parameters

str − Stream object whose format flag is affected.


Return Value

It returns Argument str.


Exceptions

Basic guarantee − if an exception is thrown, str is in a valid state.


Data races

It modifies str. Concurrent access to the same stream object may cause data races.


Example

In below example explains about std::boolalpha function.


 Live Demo

#include <iostream>     


int main () {

   bool b = true;

   std::cout << std::boolalpha << b << '\n';

   std::cout << std::noboolalpha << b << '\n';

   return 0;

}

Let us compile and run the above program, this will produce the following result −


true

1

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