#9 Arithmetic Operators in Java

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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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[@beqari]

dude has 1.25x speed by default

[@CRISTAL_MUSIC]

Still i am watching him in 1.5×

[@sudipsen3677]

Yeah bro

[@taniyasiddiqui5891]

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[@rajualiendog8954]

Yes me to watching at speet 1.5x

[@g.prudvimeher7614]

Me watching at 1.75x

[@Gattugamerfacts912]

Really sir you are great I complete 1 to 10 lecture in one day without any doubt thank you so much sir 🥺🙏

[@nirongajanayake2515]

Sir, I am really grateful for your teachings ❤️❤️

[@sandunjayasekara131]

Best series for learning java, Thank you sir

[@BLAZIN77KONG]

best tutorial ever

[@yitingchen8278]

note: when trying to assign a value or fetch a value, post-increment will behavior differently from pre-increment.

[@challacharan1648]

very much help ful

[@emhoang252]

thank you

[@Manisha_1490]

Tq sir😊😊

[@tharinduhasarangarubasinsi7714]

Sir you did really great :)

[@kirubasathish3683]

sir so num1 = num1 + 2; and num1 += 2; is the same thing?

[@The_Motobikers_World]

Yes, num1 +=2 internally works as num1=num1+2

[@user-pz7dy7uj9o]

Why video name is Assignment Operator in Java? it should be Arithmatic Operators in Java

[@durgaraoponnuru17]

When we do num1++ or some other operations, values are being changed in output. Again when we perform another operation, its being performed on default number, instead of updated value. Can anyone explain this. For eg: num1=7; when num1++ is performed, value changed to 8, Again when another operation say num1 +=1; is performed value still showing 8 instead of 9.

[@MrPradeepchandu]

Because you are giving num1=7 at start of code everytime you run

[@SanjanaGupta279]

See There is two option first is to use looping statement(For loop, while loop) For Example: class HelloWorld { public static void main (String[] args) { int num1=1; while(num1

[@vkyfox]

yovvvvv this is arithmetic operator yarrrrr

[@yashjangid4222]

sir please dont say star say Asterisk so the students can get a new work thank you sir

[@mango-strawberry]

9:56

[@nishalsreekanta7802]

4:18 the output must have been 7 right? Because num1 is assigned with 9 after increment? 9 - 2 = 7. But how was the output 5 and even in multiplication it took 7 * 8 and not 5 * 8. Can someone explain this ?

[@barathkraja5681]

It was commented out with double slash after it was made to 9. So now num 1 will be with its original value and will remain as 7. Now when num1 -= 2 is coded, it will result in output as 5. The same goes with multiplication since now original value of num1 remains 7 and when the line num1 *=8 it's num 1= num1(which is 7) *8 = 56

[@alfredndlovu356]

Was the title of this video not meant to be "Arithmetic Operators in Java" ?

[@sm07]

What is the difference Between public static void main(String a[])

[@quickkcare605]

Just a name difference, just like you can give variable any name

[@whytimes863]

No difference, bro. You can put any name there a[], args[], sampath[], anything.

[@sm07]

Thanks guys

[@abhijaiallgamesgamer2075]

i just realized u were using macOS

[@vivekvardhan6491]

when you increment the value it should print 8 but why it is printing 7.

[@hari3245]

Bcz we insert is this to system. Out. Println() ; // we insert than number it is perform value & condition & Inc/dec Ex: For(int vivek =1;vivek

[@vivekvardhan6491]

@@hari3245 So 1st the given value is going to print and then it will perform other condition right.

[@hari3245]

@@vivekvardhan6491 yeah..

[@Naveen_kumar14]

Why he used double // slash can anyone explain me

[@shazam8095]

it is used to make that line a comment which will be ignored by java while running

[@Ilamaran-n9f]

// for what purpose he was using this !!!

[@Ilamaran-n9f]

in the literal series also he didn't explain about it😔

[@nandakishore8447]

public class confus { public static void main (String args[]) { int num = 7; int a = ++num; int b = num++; System.out.println(a); System.out.println(b); } } this program getting output as 8 8 instead 8 7 any explanation please

[@ckubri5061]

bro im not sure wt u r asking but, the post n pre increment does the same job but differently...like said in the video. ++num n num++ will give the same output for 7. As we know if we give our intial value e.g num=9, we get 10 either if we give ++num or num++ but ur class name😹

[@barathkraja5681]

So the reason why b is giving result as 8 is when a= ++num is executed value of num changes to 8 and so b fetches the last updated value of num which is 8 and prints it and then increments it to 9. Now when a=++num is executed a will be printed as 10 and b as 10 and then a as 11 and b as 11 and so on. Basically value of num changes even though you assign that to a separate variable like a or b.

[@amitavaghosh7201]

Too much videos uploaded at the same time