How to sort the precedence order of operators in C language

The order of precedence of c language operators is bracket operator> unary operator> arithmetic operator> shift operator> relational operator> bitwise operator> logical operator> ; Assignment operator> comma operator. Understanding and correctly using operator precedence is one of the keys to C programming, which helps us write efficient and correct code.

#C language is a general programming language that is widely used in software development and system programming. In the C language, the precedence order of operators is very important, as it determines the order in which operators in an expression are evaluated. Below we will introduce the precedence order of operators in C language.

First, we need to understand the concept of operators. An operator is a symbol or keyword used to perform a specific operation. It operates on one or more operands and produces a result. Operators in C language include arithmetic operators, relational operators, logical operators, bitwise operators, assignment operators, etc.

In C language, the priority order of operators is determined based on the priority of the operator. When multiple operators appear in an expression, the operator with higher precedence is evaluated first, then the operator with lower precedence. If there are multiple operators with the same precedence, the order of evaluation is determined by associativity (left associative or right associative).

The following is the precedence order of common operators in C language:

1. Bracket operator ()

The bracket operator has the highest Precedence, which changes the precedence order of other operators. Use parentheses to clarify the order in which expressions are evaluated.

2. Unary operators

Unary operators include positive sign, negative sign -, increment operator, decrement operator--, address operator &, value operator *, etc. . Unary operators have higher precedence than binary operators and combine from right to left.

3. Arithmetic operators

Arithmetic operators include addition, subtraction-, multiplication*, division/ and modulo %, etc. The priority of arithmetic operators is calculated according to the mathematical operation rules. Multiplication, division and modulo have higher priority than addition and subtraction.

4. Shift operator

The shift operator includes left shift << and right shift>>. Shift operators have lower precedence than arithmetic operators.

5. Relational operators

Relational operators are used to compare the values ​​​​of two expressions, including equal to==, not equal to!=, greater than>, less than<, greater than or equal to >= and less than or equal to <=. Relational operators have lower precedence than arithmetic operators and shift operators.

6. Bitwise operators

Bitwise operators include bitwise AND&, bitwise OR|, bitwise XOR^ and bitwise negation~. Bitwise operators have lower precedence than relational operators.

7. Logical operators

Logical operators include logical AND&&, logical OR|| and logical NOT!. Logical operators have lower precedence than bitwise operators.

8. Assignment operator

Assignment operator is used to assign a value to a variable, including assignment =, compound assignment =, -=, *=, /=, etc. Assignment operators have lower precedence than logical operators.

9. Comma operator

The comma operator is used to add punctuation separators between multiple subexpressions in an expression. The comma operator has the lowest precedence and is associative from left to right.

In actual programming, we need to construct correct expressions according to the priority order of operators to avoid incorrect calculation order. In expressions with multiple operators, parentheses can be used to clarify the order of precedence to increase the readability and maintainability of the code.

To sum up, the order of precedence of operators in C language is: bracket operator> unary operator> arithmetic operator> shift operator> relational operator> bitwise operator> ; Logical operators> Assignment operators> Comma operator. Understanding and correctly using operator precedence is one of the keys to C programming, which helps us write efficient and correct code.

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