Can anyone give me it's explanation?

Question

https://code.sololearn.com/cimI8GwzjVQ0/?ref=app

Answer 1

Basically , --n is not part of the for loop because it does not have curly brackets to include multiline statement

Remember that this seems one line but this is actually two lines:

m++; --n;

As semicolons indicates the end of the line.

Therefore m will be incremented 4 times (loop iterated 4 times).
While n will be incremented by -1 only one time.

2 ---> 6
14 ---> 13

This code may help you understand better.
https://code.sololearn.com/cP94Qm8dSzwk/?ref=app

Answer 2

public class Program
{
public static void main(String[] args) {
int m=2;
int n=14;
for(int i=1;i<5;i++)
m++;--n;
System.out.println (m);
System.out.println (n);
}
}

Its equivalent to the code below
public class Program
{
public static void main(String[] args) {
int m=2;
int n=14;
for(int i=1;i<5;i++)
m++;
--n;
System.out.println (m);
System.out.println (n);
}
}
So only the m++ is part the loop because you have not used { } to scope the body of your loop only the first one instruction after the loop header is considered as part of the loop.
So m++ is looped 4× and after the other instructions are all executed one time so --n is executed 1×.

Answer 3

Atul
Are you talking about why m is 1 in my previous example?
That is a typographical error, It should be 2 and the iteration is 4 times not 5.
I apologise if such typographical errors confused you.

Answer 4

Cyan why n will be decreased once will it is not a part of loop?

Answer 5

Atul
It is decreased because of incremention.

--n

is the same with

n = n - 1

Answer 6

Cyan I understood what you explained. Actually I haven't gone through the mistake which you did😅

Answer 7

Adding the indentation, the for loop becomes:

for(int i = 1 ; i < 5 ; i++)
m++;
--n;

Now you can read it clearly, only m is affected by the loop which loops 4 times.

Answer 8

Cyan not that but n not been in the part of loop decreased by 1. Why?

Answer 9

Cyan thanks , but this stuff is a rule in Java?

Answer 10

Thanks Cyan got it

Answer 11

To make both variables change the values multiple times in the loop, you should modify the code so that :
for(int i=1;i<5;i++) {
m++;
--n;
}