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