C + + Primer Plus reading notes--6th branch statements and logical operators

6th branch statements and logical operators

1. The precedence of logical operators is lower than the precedence of relational operators.

2. && priority is higher than | |.

3. function P179 in Cctype.

4. Switch (integer-expression) parentheses must be an integer expression, the most common being an int or char, or an enumerator.

5. p190~p197 review Simple file input and output

Infile.is_open () to determine if the file opened successfully.

Infile.good () returns False when the file cannot be opened or the input data does not match or reaches the end of the file.

C + + Primer Plus reading notes--6th branch statements and logical operators