#9 Arithmetic Operators in Java

Published: 16 January 2023
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In this lecture we are discussing:
1)Assignment operator
a) = is used to assign a value to a variable
b) += is used to assign a value to a variable by adding it to the existing value
c) -= is used to assign a value to a variable by subtracting it from the existing value

-- there are many but in this lecture we discussing only some

e.g of =
int num1=11;
int num2=12;
int result = num1 + num2;
int result1=num1-num2;
int result2=num1*num2;
int result3=num1/num2;
e.g of +=
int num=1;
num +=1; = num = num+1;
num +=5; = num = num+5;

e.g of -=
int num2=2;
num -=1; num =num-1;
num -=5; num =num-5;

2)increment and decrement operator
-- there are two type of increment and decrement operator
a) pre
b) post

-- post increment and decrement operator
int num=1;
num++;
System.out.println(num); // 2
-- this operator is known as post increment operator

num--;
System.out.println(num); //1
-- this operator is know as post decrement operator

-- pre increment and decrement operator
int num=2;
++num;
System.out.println(num);//3

--num;
System.out.println(num);//2

Difference between pre and post operator
e.g for that we take one example
int num=5;
System.out.println(num++); // 5 is print on console

int num1=5;
System.out.println(++num); //6 is printed on screen

in post
first assignment and then increment
e.g int num=5; int copy;
copy=num++; in this case first num=5 assign to copy then increment the num
copy value is 5;

in pre
first increment then assignment
e.g int num=5;
int copy;
copy = ++num;

in this case first increment num value from 5 to 6 then assign to copy.
copy value is 6;

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