Part 1: Writing Exercise: (5 pts) The following are the exercises about the loop
ID: 672369 • Letter: P
Question
Part 1: Writing Exercise: (5 pts)
The following are the exercises about the loops in Java. Write the answers in a comment block
before the code of Part2.
a. What are the three required expressions of a for-loop? (1 pts)
b. Consider the following code. This code was written to generate the output as shown in
Output 2. However, there is an error in this code. Correct the code so that it is able to
generate the desired output. (2 pts)
int count = 0;
while (count < 10)
{
System.out.println("count:" + count);
}
Output 2
count:0
count:1
count:2
count:3
count:4
count:5
count:6
count:7
count:8
count:9
c. What is the output of the following code? (2 pts)
int i =0;
do
{
System.out.println("i is : " + i);
i++;
}while(i < 5);
Explanation / Answer
a. What are the three required expressions of a for-loop? (1 pts)
The three required expressions of a for-loop are initialization, terminatio and increment.
Here
The initialization expression initializes the loop; it is executed once at the loop begining.
The loop terminates , when the termination expression evaluates to false.
After each iteration through the loop the increment expression is invoked. it is perfectly acceptable for this expression to increment or decrement a value.
If these 3 expression are null [for(;;)], then the loop executes infinitely.
See https://docs.oracle.com/javase/tutorial/java/nutsandbolts/for.html for more information on java for-loop
b) Error in the code is : the variable count is not incremented, so it always prints Count: 0 only and the loop
runs indefinitely as count never increments.
Corrected code
int count = 0;
while (count < 10)
{
System.out.println("count:" + count);
count++;
}
c) output of the code
i is : 0
i is : 1
i is : 2
i is : 3
i is : 4
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