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:
CPP
CPP
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:
Example 2:
is eofbit set: 0 clear() used to set eofbit is eofbit set: 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 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:
Reference: hhttps://cplusplus.com/reference/ios/ios/clear/is failbit set: 0 clear() used to set failbit is failbit set: 1
