The clear() method of ios class in C++ is used to change the current state of the specified flag by setting it. Hence this function changes the internal state of this stream.
Syntax:
void clear(iostate state)
Parameters: This method accepts the iostate as parameter which is the flag bit to be set in this stream. It can be goodbit, failbit, eofbit or badbit.
Return Value: This method do not return anything.
Example 1:
// C++ code to demonstrate // the working of clear() function #include <bits/stdc++.h> using namespace std;
int main()
{ // Stream
stringstream ss;
// Print the result
cout << "is eofbit set: "
<< ss.eof() << endl;
// Using clear() function
ss.clear(ss.eofbit);
cout << "clear() used to set eofbit "
<< endl;
// Print the result
cout << "is eofbit set: "
<< ss.eof() << endl;
return 0;
} |
Output:
is eofbit set: 0 clear() used to set eofbit is eofbit set: 1
Example 2:
// C++ code to demonstrate // the working of clear() function #include <bits/stdc++.h> using namespace std;
int main()
{ // Stream
stringstream ss;
// Print the result
cout << "is failbit set: "
<< ss.fail() << endl;
// Using clear() function
ss.clear(ss.failbit);
cout << "clear() used to set failbit "
<< endl;
// Print the result
cout << "is failbit set: "
<< ss.fail() << endl;
return 0;
} |
Output:
is failbit set: 0 clear() used to set failbit is failbit set: 1
Reference: hhttp://www.cplusplus.com/reference/ios/ios/clear/