Assessment: Writing Loops

Section 8.4 Assessment: Writing Loops

Subgoals for Writing a Loop.

Determine purpose of loop
1. Pick a loop structure (while, for, do_while)
Define and initialize variables
Determine termination condition
1. Invert termination condition to continuation condition
Write loop body
1. Update loop control variable to reach termination

Exercises Exercises

1.

Q1: Given the following code segment:

int x = 1;
while ( /* condition */ ) {
   if (x % 2 == 0) {
      System.out.print(x + "  ");
   }
   x = x + 2;
}

Consider the following conditions to replace /* condition */ in the code segment:

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x < 0
x <= 1
x < 10

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For which of the conditions will nothing be printed?

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I only
II only
I and II only
I and III only
I, II and III

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2.

Q2: Given the following code segment which is intended to print the number of integers that evenly divide the integer inputVal. You may assume that inputVal > 0. Which of the following can be used to replace /* condition */ so that numDivisors will work as intended?

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int count = 0;
int inputVal = /* user entered value */
for (int k = 1; k <= inputVal; k++) {
   if ( /* condition */ ) {
      count++;
   }
} // end for
System.out.println(count);

inputVal % k == 0
k % inputVal == 0
inputVal % k != 0
inputVal / k == 0
k / inputVal > 0

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3.

Q3: Which of the following code segments will produce the output:

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1 4 7 10 13 16 19

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int k = 1;
while (k < 20) {
   if (k % 3 == 1)
      System.out.print(k + "  ");
   k = k + 3;
}

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for (int k = 1; k < 20; k++) {
   if (k % 3 == 1)
      System.out.print(k + "  ");
}

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for (int k = 1; k < 20; k = k + 3) {
   System.out.print(k + "  ");
}

I only
II only
I and II only
I and III only
I, II and III

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4.

Q4: What is the maximum number of times “Hello” can be printed?

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int k = // a random number such that 1 <= k <= n ;
for (int p = 2; p <= k; p++) {
   for (int r = 1; r < k; r++)
      System.out.println("Hello");
}

2
n - 1
n - 2
(n - 1) * (n - 1)
n * n

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