17. Parentheses in the expression

In a complex expression, you are not very clear about the priorities of operators. Even if you know the priority, add brackets. Otherwise, when someone else or another person reads a program, he may not be careful when looking at it. To avoid this "misunderstanding", or make his or her program clearer, add brackets.

For example, get the address of a structure member:

Getuserage (& (userinfo-> Age ));

In & userinfo-> Age, the-> operator has the highest priority, but adding a bracket will give you a clear picture of what your code means.

For example, a long condition judgment:

If (CH [0]> = '0' | ch [0] <= '9 ')&&
(CH [1]> = 'A' | ch [1] <= 'Z ')&&
(CH [2]> = 'A' | ch [2] <= 'Z '))

Parentheses and line breaks. Is your code easy to understand?