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ios fail() function in C++ with Examples
  • Difficulty Level : Basic
  • Last Updated : 02 Sep, 2019

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:






// 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:




// 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: hhttp://www.cplusplus.com/reference/ios/ios/fail/

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