Introduction to expressions and operators in C language

1、 Expressions are like the mathematical formulas used in ordinary learning , By operator （operator） And operands （operand） form .

Operands include constants 、 Variable 、 Function calls and other expressions .

Operators have assignment operators , Arithmetic operator , Comparison operator , Logical operators 、 Increment decrement operator 、 An operator 6 Kind of .

Examples are as follows ：

y=520x+a*b+1/c

among =、+、*、/ Symbols belong to operators , constant 520, Variable y,x,a,b,c Belongs to operand .

2、C Expressions in the language use the middle order method , At the same time, it will also involve the priority and associativity of operators .

Middle order method （Infix）: Operator between two operands , for example a+b、(a+b)*(c+d) And so on are all middle order representations .

3、C Language expressions can be divided into... According to the number of operands handled by operators “ A unary expression ”、“ Binary expression ” and “ Ternary expression ”3 Kind of .

 4、C The calculation priority of various operators in the language is shown in the following table ：

Operator precedence	explain
（）	Brackets , From left to right
[ ]	square brackets , From left to right
！ -	Logical operations NOT Minus sign
~	An operator , From right to left
++、--	Increasing and decreasing operations , From right to left
* / %	Multiplication Division operations Remainder operation 、 From left to right
+ -	Addition operation Subtraction
<< >>	Bit left operation Bitwise right operation
> >= < <= == !=	Comparison operations , Greater than Comparison operations , Greater than or equal to Comparison operations , Less than Comparison operations , Less than or equal to Comparison operations , be equal to Comparison operations , It's not equal to , From left to right
& ^ |	An operation AND, From left to right An operation XOR（ Exclusive or ） An operation OR, From left to right
&& ||	Logical operations AND Logical operations OR, From left to right
？：	Conditional operation , From right to left
=	The assignment operation , From right to left

 

This column also has a summary and sharing of operators , Ongoing update , To be continued ……