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ios manipulators boolalpha() function in C++
  • Last Updated : 28 Aug, 2019

The boolalpha() method of stream manipulators in C++ is used to set the boolalpha format flag for the specified str stream.

Syntax:

ios_base& boolalpha (ios_base& str)

Parameters: This method accepts str as a a parameter which is the stream for which the format flag is affected.

Return Value: This method returns the stream str with boolalpha format flag set.

Example 1:



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// C++ code to demonstrate
// the working of boolalpha() function
  
#include <iostream>
  
using namespace std;
  
int main()
{
  
    // Initializing the boolean flag
    bool flag = true;
  
    // Using boolalpha()
    cout << "boolalpha flag: "
         << boolalpha << flag << endl;
  
    return 0;
}

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Output:

boolalpha flag: true

Example 2:

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// C++ code to demonstrate
// the working of boolalpha() function
  
#include <iostream>
  
using namespace std;
  
int main()
{
  
    // Initializing the boolean flag
    bool flag = false;
  
    // Using boolalpha()
    cout << "boolalpha flag: "
         << boolalpha << flag << endl;
  
    return 0;
}

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Output:

boolalpha flag: false

Reference: http://www.cplusplus.com/reference/ios/boolalpha/

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