ios fail() function in C++ with Examples

The fail() method of ios class in C++ is used to check if the stream is has raised any fail error. It means that this function will check if this stream has its failbit set. Syntax:

bool fail() const;

Parameters: This method does not accept any parameter. Return Value: This method returns true if the stream has failbit set, else false. Example 1:

CPP

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

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

int main()
{

    // Stream
    stringstream ss;

    // Using fail() function
    bool isFail = ss.fail();

    // print result
    cout << "is stream fail: "
         << isFail << endl;

    return 0;
}

Output:

is stream fail: 0

Example 2:

CPP

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

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

int main()
{

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

    // Using fail() function
    bool isFail = ss.fail();

    // print result
    cout << "is stream fail: "
         << isFail << endl;

    return 0;
}

Output:

is stream fail: 1

Reference: hhttps://cplusplus.com/reference/ios/ios/fail/

ios fail() function in C++ with Examples

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