Question

Naming should help to distinguish between a variable and a constant. How should you be able to tell them apart?

Binary operators are pretty easy, but for the unary operators, what do you need to remember about the differences between prefixing and postfixing an increment or decrement operator?

What is the key element of syntax to remember when using a shortcut assignment operator?

Answer 1

variable : We can change the value of the variable with another value then the varible will hold the new value

Ex: int a=10; // See now the variable 'a' is holding the value 10

a=20 // we assigned 20 to the variable.So the value 10 is replaced with 20.

Now the value inside the variable a is 20

Constant: here we cant replace or reassign the variable with another value once declared and assigned a value.

Ex: final int a=10 ; See now the variable 'a' is holding the value 10

a=20 // Which is incorrect.it wont give us a chance to reassign the variable with new value.

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2)

Binary operators: generally we use binary operators to act on two operands.

like a + b, a * b etc

But coming to the Uninary operators , these are the operators which act on single variables.

Ex: int a=10 ; // The variable a is holding the value 10

++a; this is the prefix increment operation. As the increment of the value is done before the assignment

a++; this is the post fix increment operation. As the increment of the value is done after the assignment.

Like in the same way we have prefix and postfix decrement operators.

--a; this is the prefix decrement operation. As the decrement of the value is done before the assignment

a--; this is the postfix decrement operation. As the decrement of the value is done after the assignment

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We can use shortcut assignment operator in arithmetic operations.

Ex: +=, -=, *=, /=

a+=5 ; This is same as a= a+5;

a-=5 ; this is same as a=a-5;

========================Thank You