ios rdstate() function in C++ with Examples

ios operator !() function in C++ with Examples

Last Updated : 02 Sep, 2019

The operator!() method of ios class in C++ is used to any error flag of this stream is set. This includes the failbit or the badbit.

Syntax:

bool operator!()  const;

Parameters: This method does not accept any parameter.

Return Value: This method returns true if any error bit is set of this stream, else false.

Example 1:

// C++ code to demonstrate 
// the working of operator!() function 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // Stream 
    stringstream ss; 
  
    // Using operator!() function 
    if (!ss) { 
        cout << "Error bit is set.\n"; 
    } 
    else { 
        cout << "No error bit is set.\n"; 
    } 
  
    return 0; 
} 

Output:

No error bit is set.

Example 2:

// C++ code to demonstrate 
// the working of operator!() function 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // Stream 
    stringstream ss; 
    ss.clear(ss.failbit); 
  
    // Using operator!() function 
    if (!ss) { 
        cout << "Error bit is set.\n"; 
    } 
    else { 
        cout << "No error bit is set.\n"; 
    } 
  
    return 0; 
} 

Output:

Error bit is set.

Reference: hhttp://www.cplusplus.com/reference/ios/ios/operator!/

ios rdstate() function in C++ with Examples

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