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ios manipulators boolalpha() function in C++

Last Updated : 12 Jul, 2025
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:
Output:
boolalpha flag: true
Example 2:
Output:
boolalpha flag: false
Reference: https://cplusplus.com/reference/ios/boolalpha/
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