Computer Applications
How many times are the following loop bodies repeated? What is the final output in each case?
int z = 1;
while (z < 10)
if((z++) % 2 == 0)
System.out.println(z);
Java Iterative Stmts
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Answer
The loop executes 9 times.
Output
3
5
7
9
Explanation
The loop executes 9 times. Value of z is printed 4 times inside the loop. The condition if((z++) % 2 == 0) will be false when z is odd and true when z is even. Value of z will be incremented after if check is performed due to post increment operator z++. Execution of the loop is summarized in the table below:
| Iterations | z | (z++) % 2 == 0 | Output | Remarks |
|---|---|---|---|---|
| 1st | 1 | False | Value of z becomes 2 after if check as z++ increments it after the evaluation of (z++) % 2 == 0 | |
| 2nd | 2 | True | 3 | z becomes 3 after if check, hence 3 is printed in this iteration. |
| 3rd | 3 | False | z becomes 4. | |
| 4th | 4 | True | 5 | z becomes 5. |
| 5th | 5 | False | z becomes 6. | |
| 6th | 6 | True | 7 | z becomes 7. |
| 7th | 7 | False | z becomes 8. | |
| 8th | 8 | True | 9 | z becomes 9. |
| 9th | 9 | False | z becomes 10. |
As value of z is now 10, the test condition of while loop becomes false hence, 10th iteration of the loop is not executed.
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