ios rdstate() function in C++ with Examples

Last Updated : 12 Jul, 2025
The rdstate() method of ios class in C++ is used to read the internal state of this stream. Syntax: 
iostate rdstate() const;
Parameters: This method does not accept any parameter. Return Value: This method returns the current internal state of this stream. Example 1: CPP 
// C++ code to demonstrate
// the working of rdstate() function

#include <bits/stdc++.h>
using namespace std;

int main()
{

    // Stream
    stringstream ss;

    // Using rdstate() function
    cout << "stream rdstate: "
         << ss.rdstate() << endl;

    return 0;
}
Output: 
stream rdstate: 0
Example 2: CPP 
// C++ code to demonstrate
// the working of rdstate() function

#include <bits/stdc++.h>
using namespace std;

int main()
{

    // Stream
    stringstream ss;
    ss.clear(ss.failbit);

    // Using rdstate() function
    cout << "stream rdstate: "
         << ss.rdstate() << endl;

    return 0;
}
Output: 
stream rdstate: 4
Reference: hhttps://cplusplus.com/reference/ios/ios/rdstate/
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