Difference between two Java codes

[Gihan Madushanka]

Hello Everyone !!!
Can anybody explain me the difference between these two codes ?

//Code no 1
public class exerciselb{
    public static void main(String args[]){
        int x=5;
        while(x>1){
            x--; // x is decremented before if condition is checked <-----------
            if(x<3){
                System.out.println("small x");
            }
    
        }
    }
}

output of code no 1
small x
small x

// code no 2

public class exerciselb{
    public static void main(String args[]){
        int x=5;
        while(x>1){
            if(x<3){
                System.out.println("small x");
            }
            x--; // x is decremented after if condition is checked <-------------
        }
    }
}

output of code no 2
small x

Why does output differ when x is decremented before or after x ?
Is this while and do while situation ?

Thanks

[Ankit Garg]

In your code 1 you are decrementing x twice and in the code 2 you are decrementing it once. Also are you sure the output you have given is correct?

[Gihan Madushanka]

Ankit Garg wrote:In your code 1 you are decrementing x twice and in the code 2 you are decrementing it once. Also are you sure the output you have given is correct?

Dear Ankit Garg
There were some mistakes in the code.
I corrected them.
Can you see it now please ?

[Ramesh Pramuditha Rathnayake]

I think you have eclipse or netBeans with you. Then the best thing is press "step into" button to debug(Normally F7 key). By pressing that key you can see how variables are declared values.


For both cases, while loop is run for 4 times.

1st Code:
x==5: x is decreased by one. Now x=4. Therefore if is not running.
x==4: x is decreased by one. Now x=3. Therefore if is not running.
x==3: x is decreased by one. Now x=2. Therefore if is running. print "small x"
x==2: x is decreased by one. Now x=1. Therefore if is running. print "small x"
x==1: Exit while loop


2nd Code:
x==5: If is not running as x=5. x is decreased by one. Now x=4.
x==4: If is not running as x=4. x is decreased by one. Now x=3.
x==3: If is not running as x=3. x is decreased by one. Now x=2.
x==2: If is running. print "small x". x is decreased by one. Now x=1.
x==1: Exit while loop

[Gihan Madushanka]

Thanks