==

!=

Allows comparison of operands of different types

left union

Logical between relational operators and assignment operators

effect

Include

priority

Features

Combining rules

error-prone

Use relational operators to connect two expressions into meaningful sentences

the value of a relational expression

&&and

||or

!No

The operation result can be derived based on the left operand, and there is no need to calculate the right operand.

Use logical operators to connect one or two expressions into meaningful expressions

When the value of the expression is a relational or equality expression, the value of the expression is 0 or 1

When the expression is an ordinary expression, a non-zero value is true and a zero value is false.

unary minus operator

Unary plus sign operator (generally not used)

add

/division

Take remainder

i,--i

i (first) increases or decreases immediately

i,i--

i last increments or decrements

v=e

e can be a variable, constant, or expression

Assigning a floating point number to an integer variable rounds towards zero

v and e are different types. The assignment operator will convert the type of e into the type of v.

Multiple assignment operators used together

Cannot be written where the variable is declared

Right associative (i.e. operating from right to left)

Use with caution

common

error-prone

other

Represents an object that occupies storage space in computer memory

The left operand of an assignment operator must be an lvalue

Prefix increment/decrement>suffix increment/decrement=unary operator>multiplication class>addition class>assignment operation

error-prone