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ios clear() function in C++ with Examples

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The clear() method of ios class in C++ is used to change the current state of the specified flag by setting it. Hence this function changes the internal state of this stream.


void clear(iostate state)

Parameters: This method accepts the iostate as parameter which is the flag bit to be set in this stream. It can be goodbit, failbit, eofbit or badbit.

Return Value: This method do not return anything.

Example 1:

// C++ code to demonstrate
// the working of clear() function
#include <bits/stdc++.h>
using namespace std;
int main()
    // Stream
    stringstream ss;
    // Print the result
    cout << "is failbit set: "
         << << endl;
    // Using clear() function
    cout << "clear() used to set failbit "
         << endl;
    // Print the result
    cout << "is failbit set: "
         << << endl;
    return 0;


is eofbit set: 0
clear() used to set eofbit 
is eofbit set: 1

Example 2:


is failbit set: 0
clear() used to set failbit 
is failbit set: 1

Reference: h

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Last Updated : 02 Sep, 2019
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