Multiple Choice Question

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Submitted by c-admin on Tue, 05/28/2019 - 22:07

QID:

163

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

Looping Constructs

Question:

How many times will the line marked //1 be called in the following code?

int x = 10;
do{
x--;
System.out.println(x); // 1
}while(x&lt;10);

Select 1 option

A. 0
B. 1
C. 9
D. 10
E. None of these.

Answer and Explanation (Click to expand)

Answer:

Explanation:

A do-while loop is always executed at least once. So in the first iteration, x is decremented and becomes 9. Now the while condition is tested, which returns true because 9 is less than 10. So the loop is executed again with x = 9. In the loop, x is decremented to 8 and the condition is tested again, which again returns true because 8 is less than 10.

As you can see, x keeps on decreasing by one in each iteration and every time the condition x<10 returns true. However, after x reaches -2147483648, which is its MIN_VALUE, it cannot decrease any further and at this time when x-- is executed, the value rolls over to 2147483647, which is Integer.MAX_VALUE. At this time, the condition x<10 fails and the loop terminates.

Q&A Set:

Set 17

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