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Subgoals

Section 8.4 Assessment: Writing Loops

Subgoals for Writing a Loop.

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

    1.

    Q1: Given the following code segment:
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    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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    1. x < 0
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    2. x <= 1
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    3. x < 10
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    For which of the conditions will nothing be printed?
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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
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    • k % inputVal == 0
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    • inputVal % k != 0
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    • inputVal / k == 0
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    • 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;
}

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

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