CIN judgment Read End C + + language

CIN is a C + + input stream that can be read by >>.

Judging the end of reading, there are generally two methods, depending on the contract with the input.

1 ends with a special value.

If you enter an integer, ending with-1, then when you read-1, make sure the read is finished.

Code:

int n; while (1) {      cin>>n;      if (n == -1) break ;      //处理输入的合法值。

}

2 ends with EOF, which is the file terminator.

This approach applies to file as input, or the keyboard to manually enter a file terminator as the end tag.

Code:

int n; while (cin>>n) {      //处理输入的合法值。

}

The way to enter EOF on Windows is CTRL + Z

The method of entering EOF on other platforms is Ctrl+d

CIN judgment Read End C + + language