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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_ios_unsetf.htm below:

C++ IOS Library - Unsetf

It is used to clear specific format flags.

Following is the declaration for ios_base::unsetf function.

void unsetf (fmtflags mask);

mask − Bitmask specifying the flags to be cleared. The flags are specified as a combination of flags of the fmtflags member type.

none

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

Modifies the stream object. Concurrent access to the same stream object may cause data races.

In below example explains about ios_base::unsetf function.

#include <iostream>     

int main () {
   std::cout.setf ( std::ios::hex, std::ios::basefield );  
   std::cout.setf ( std::ios::showbase );                  
   std::cout << 100 << '\n';
   std::cout.unsetf ( std::ios::showbase );                
   std::cout << 100 << '\n';
   return 0;
}

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

 0x64
64

ios.htm

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