Definition Analysis Based on the stream status in ios

1: iostate rdstate () const; the return value is iostate, which is simply an int value. A status is indicated by setting a location of binary data to 1.

2: failbit is defined as follows. When the second bit of binary data is 1, it indicates this data.

Static const _ Iostate goodbit = (_ Iostate) 0x0; static const _ Iostate eofbit = (_ Iostate) 0x1; static const _ Iostate failbit = (_ Iostate) 0x2; static const _ Iostate badbit = (_ Iostate) 0x4; static const _ Iostate _ Hardfail = (_ Iostate) 0x10;

3: input. rdstate () & std: ios: failbit checks whether the current status is failbit through bitwise operation and.