Operators and expressions, and precedence of operators

1. What is an operator:

For executing program code operations, operations are performed on one or more operand items.

2. Classification of operators:

Use points: basic operators, conditional operators, logical operators.

According to the operation of several points: one eye, binocular, trinocular operation.

3. What is an expression:

is a combination of numbers, operators, numeric grouping symbols (parentheses), free variables, and constraint variables that can be obtained by means of a meaningful arrangement of values.

4. Precedence of operators:

(1) One eye > Binocular > Three Mesh

(2) The first with parentheses

Add: Self-increment 1, self-minus 1 operator are single-mesh operation, all have right-associative. These can be in the following ways:

• • • The ++i:i is added 1 and then participates in other operations.
    • --I:I 1 and then participate in other operations.
    • After the I++:I participates in the operation, the value of I is increased by 1.
    • After the I--:I participates in the operation, the value of I is reduced by 1.

Operators and expressions, and precedence of operators