Java Programming - Operators and Assignments - Discussion

Discussion Forum : Operators and Assignments - Finding the output (Q.No. 7)

Operators and Assignments

What will be the output of the program?

class Test 
{
    public static void main(String [] args) 
    {
        int x= 0;
        int y= 0;
        for (int z = 0; z < 5; z++) 
        {
            if (( ++x > 2 ) && (++y > 2)) 
            {
                x++;
            }
        }
        System.out.println(x + " " + y);
    }
}

5 2

5 3

6 3

6 4

Answer: Option

Explanation:

In the first two iterations x is incremented once and y is not because of the short circuit && operator. In the third and forth iterations x and y are each incremented, and in the fifth iteration x is doubly incremented and y is incremented.

Discussion:

30 comments Page 1 of 3.

Moha said: 5 years ago

x=1 >2 wrong
z++
z=1
x=2>2 wrong
z++
z=2
x=3>2 yes
&&
1>2? wrong
z=3
x=4
2>2 rong
z=4
x=5
3>2 yes.

x++ x=6.
So, o/p: 6 3.

(5)

Keerthi said: 2 years ago

@All.

Check the first condition and till it is true it won't go to the second condition so when x becomes 3 and the condition satisfies (3>2) then only condition two comes into consideration like y=1 then x also increments by 4.

(2)

Niharika patidar said: 6 years ago

Please explain to me.

What is the reason that ++y is not executed for the first two times?

(1)

G.vivek said: 9 years ago

Short-circuit(&&):

(x&&y) -> X is false, then Y not evaluated. X is true, then Y will be evaluated.

Above problem's Solution is:

for(int z=0;0<5;z++)->if((1>2)&&(0>2))..X is false then Y not evaluated
for(int z=1;1<5;z++)->if((2>2)&&(0>2))..X is false then Y not evaluated
for(int z=2;2<5;z++)->if((3>2)&&(1>2))..X is true then Y is evaluated
for(int z=3;3<5;z++)->if((4>2)&&(2>2))..X is true then Y is evaluated
for(int z=4;4<5;z++)->if((5>2)&&(3>2))..X is true then Y is evaluated

Finally, (X and Y both as true then X value was incremented)

=> X is 6
=> Y is 3

If(X&&Y) //X and Y both true then
{
X++; // X value is incremented
}

(1)

Rajesh said: 8 years ago

Awesome, thanks @Vivek.

Sushaja said: 3 years ago

@Arnold.

Thank you for explaining the short circuit operator's operation in detail.

Unknown said: 6 years ago

output of int z=2; while(z<20) if((z++)%2==0) system.out.println(z);

Anu said: 6 years ago

Thanks @Saranya and @G. Vivek.

Swapnil said: 7 years ago

Thank you so much @Arnold.

Aparna said: 7 years ago

Hi, Please explain this problem using OR.

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