How many times will the print statement execute in the following code? Answer is

Question

How many times will the print statement execute in the following code? Answer is 6, but i dont understand how. The first condition would carry out 4 times untill it got to the array length. But, i am lost on the second condition. If y = 0 and x would be 0 on the in the begining wouldnt 0 < 0 be false and the next one would be y = 1 and x = 1 which would be false too.

int[] myArray = new int[4];
for (int x = 0; x < myArray.length; x++) {

for (int y = 0; y < x; y++) { System.out.println( myArray[x] );

} }

Explanation / Answer

int[] myArray = new int[4];
for (int x = 0; x < myArray.length; x++)
{ // a)
for (int y = 0; y < x; y++)
{ // b)
System.out.println( myArray[x] );
}
}

1) The control enters the outer for loop it assigns the value 0 to x and the logical expression x < myArray.length ( 0 < 4) is evaluated.
The logical expression results true so the control enters at the left brace ( point // a)
2) The control enters the inner for loop it assigns the value 0 to y and the logical expression y < x ( 0 < 0) is evaluated.
The logical expression results false so the control comes out of the inner for loop
3) Now the control goes to x++ and x value is incremented by 1.
and the logical expression x < myArray.length ( 1 < 4) is evaluated.
4) The control enters the inner for loop it assigns the value 0 to y and the logical expression y < x ( 0 < 1) is evaluated.
The logical expression results true so the control enters the left brace ( point //b)
5) So the statements are executed with in the braces. There is only one statement System.out.println( myArray[x] );
So that is executed.
6) After executing the statement right brace is there
so the control goes to y++ and y is incremented by 1.
Then and the logical expression y < x ( 1 < 1) is evaluated.
It results false. So the control comes out of the loop.
7) From step 3 it is followed.

X Value

Y Value

Result

0

0

Not executed

1

0

Executed

1

1

Not executed

2

0

Executed

2

1

Executed

2

2

Not Executed

3

0

Executed

3

1

Executed

3

2

Executed

3

3

Not Executed

4

Comes out of the loop

Program ends

Description

X Value

Y Value

Result

0

0

Not executed

1

0

Executed

1

1

Not executed

2

0

Executed

2

1

Executed

2

2

Not Executed

3

0

Executed

3

1

Executed

3

2

Executed

3

3

Not Executed

4

Comes out of the loop

Program ends

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