Dart provides some relatively simple operators to simplify the operation, most of them are the same as Java, the following introduces a few different operators
Arithmetic operator
Sr.No  Operators & Meaning 

1  +
Add 
2  −
Subtract 
3  expr
Unary minus, also known as negation (reverse the sign of the expression) 
4  *
Multiply 
5  /
Divide 
6  ~/
Divide, returning an integer result 
7  %
Get the remainder of an integer division (modulo) 
8  ++
Increment 
9  
Decrement 
Arithmetic Operators Example
int a = 2;
print(a++);// 2 print(a);//4 
Relational operator
Relational Operators tests or defines the kind of relationship between two entities. Relational operators return a Boolean value i.e. true/ false
Operator  Description  Example 

>  Greater than  (A > B) is False 
<  Lesser than  (A < B) is True 
>=  Greater than or equal to  (A >= B) is False 
<=  Lesser than or equal to  (A <= B) is True 
==  Equality  (A==B) is False 
!=  Not equal  (A!=B) is True 
Relational operator Example
int a = 2; 
logic operation
Boolean operations
Logical operators are used to combine two or more conditions. Logical operators return a Boolean value
Operator  Description  Example 

&& 
And − The operator returns true only if all the expressions specified return true 
(A > 10 && B > 10) is False. 
 
OR − The operator returns true if at least one of the expressions specified return true 
(A > 10  B > 10) is True. 
! 
NOT − The operator returns the inverse of the expression’s result. For E.g.: !(7>5) returns false 
!(A > 10) is True. 
Example
bool isTrue = true; 
Assignment operators
The following table lists the assignment operators available in Dart.
Sr.No  Operator & Description 

1  =(Simple Assignment )
Assigns values from the right side operand to the left side operand Ex:C = A + B will assign the value of A + B into C 
2  ??=
Assign the value only if the variable is null 
3  +=(Add and Assignment)
It adds the right operand to the left operand and assigns the result to the left operand. Ex: C += A is equivalent to C = C + A 
4  ?=(Subtract and Assignment)
It subtracts the right operand from the left operand and assigns the result to the left operand. Ex: C = A is equivalent to C = C – A 
5  *=(Multiply and Assignment)
It multiplies the right operand with the left operand and assigns the result to the left operand. Ex: C *= A is equivalent to C = C * A 
6  /=(Divide and Assignment)
It divides the left operand with the right operand and assigns the result to the left operand. 
Example
int m = 10;
m = 2; 
1. Trinocular operator: condition? Expr1: expe2
If condition is true, the expression evaluates expr1 (and returns its value); otherwise, it evaluates and returns the value of expr2.
2. ?? Operator: expr1 ?? expr2
If expr1 is nonnull, return its value; otherwise, calculate and return the value of expr2
Example
int age =10;
String z = x ?? y; 
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