Explain me this code please.

Question

int a=0, b=0;
while(a<3)
{
++a;
a*=a;
b+=a;
}
Console.Write(b);

Answer 1

while loop runs till a's value is less than 3

++a increases value of a
Now a is 1
a*=a means
a=a*a
which is a=1
and then b+=a
is b=b+a
b=0+1
b=1

again ++a
a=2 now
a*=a
a=2*2
a=4
b=1+4
b=5

now since a is 4 and greater than 3 Loop terminates
and 5 is printed

Answer 2

Abhay And what will be the result if there will be a++ instead of ++a, 0?

Answer 3

I thought i knew the difference between ++i and i++ but i guess not. Well, i need to read and practice more, thanks a lot friend

Answer 4

Thanks a lot i will keep on trying :)

Answer 5

👍👍👍👍👍👍👍👍👍

Answer 6

hello,
if you alter the code and write
a++
it would not affect the output which is (5)
a++ and ++a will only differ when you will assign them to a variable
thanks!

Answer 7

It will be same ,it doesn't matter here if you increase it's value before or after
however if that was something like

b=++a
then b value would be 1 and a also 1

and
If it was
b=a++
then b value would be
0 and a also 0

Then a would get incremented immediately after that and a will be 1

Answer 8

while(a<3) is used to run till the value of a will be less than 3.

Initially a=0, b=0

In the first iteration 0 < 3 is satisfied
It first checks the condition of the while loop, if it is satisfied it will enter the loop and perform the following steps

1) ++a which is used to increment the value of a

(a++ returns the value after it is incremented, while ++a returns the value before it is incremented. There will be no change in this particular code.)

So value of a becomes 1

2) a*=a -> a = a * a -> a = 1 * 1 -> a = 1
3) b+=a -> b = b + a -> b = 0 + 1 -> b = 1

In the next iteration, it checks if 1 < 3 which is satisfied.
It performs the following steps again
1) ++a
Value of a becomes 2

2) a*=a -> a = a * a -> a = 2 * 2 -> a = 4
3) b+=a -> b = b + a -> b = 1 + 4 -> b = 5

Next iteration the condition a < 3 fails as a = 4
Therefore it comes out of the loop and prints the value of b which is 5.

I hope this was of some help!

Answer 9

Thank You :) i got it