iomanip resetiosflags() function in C++ with Examples

Last Updated : 12 Jul, 2025

The resetiosflags() method of iomanip library in C++ is used to reset the ios library format flags specified as the parameter to this method.
Syntax: 
 

resetiosflags (ios_base::format_flag)


Parameters: This method accepts format_flag as a parameter which is the ios library format flag to be reset by this method.
Return Value: This method does not returns anything. It only acts as stream manipulators.
Example 1:
 

CPP 
// C++ code to demonstrate
// the working of resetiosflags() function

#include <iomanip>
#include <ios>
#include <iostream>

using namespace std;

int main()
{

    // Initializing the integer
    int num = 50;

    cout << "Before reset: \n"
         << hex
         << setiosflags(ios::showbase)
         << num << endl;

    // Using resetiosflags()
    cout << "Resetting showbase flag"
         << " using resetiosflags: \n"
         << resetiosflags(ios::showbase)
         << num << endl;

    return 0;
}

Output: 
Before reset: 
0x32
Resetting showbase flag using resetiosflags: 
32

 

Example 2:
 

CPP 
// C++ code to demonstrate
// the working of resetiosflags() function

#include <iomanip>
#include <ios>
#include <iostream>

using namespace std;

int main()
{

    // Initializing the integer
    int num = 50;

    cout << "Before reset: \n"
         << hex
         << setiosflags(ios::showbase)
         << num << endl;

    // Using resetiosflags()
    cout << "Resetting showbase and uppercase"
         << " flag using resetiosflags: \n"
         << resetiosflags(ios::showbase)
         << num << endl;

    return 0;
}

Output: 
Before reset: 
0x32
Resetting showbase and uppercase flag using resetiosflags: 
32

 

Reference: https://cplusplus.com/reference/iomanip/resetiosflags/
 

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