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Subgoals

Section 7.2 Loops-WE1-P1

Subgoals for Evaluating a Loop.

  1. Identify loop parts
    1. Determine start condition
    2. Determine update condition
    3. Determine termination condition
    4. Determine body that is repeated
  2. Trace the loop
    1. For every iteration of loop, write down values
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Subsection 7.2.1

Exercises Exercises

1.
Q1: What is the output of the following loop?
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int i = 0;
while (i < 3) {
   System.out.println("hi");
   i++;
}
Figure 7.2.1.
  • See diagram for answer A
  • See diagram for answer B
  • See diagram for answer C
  • See diagram for answer D
  • See diagram for answer E
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2.
Q2: What is the output of the following loop?
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int i = 10;
while (i > 1) {
   System.out.print(i + " ");
   i--;
}
  • 10 9 8 7 6 5 4 3 2 1
  • 9 8 7 6 5 4 3 2 1
  • 9 8 7 6 5 4 3 2
  • 10 9 8 7 6 5 4 3 2
  • compiler error
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3.
Q3: What is the output of the following loop?
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int i = 10;
while (i > 1) {
   System.out.print(i + " ");
   i++;
}
  • 10 11 12 13 14 15 16
  • 10 9 8 7 6 5 4 3 2
  • 10 9 8 7 6 5 4 3 2 1
  • 1 2 3 4 5 6 7 8 9 10
  • infinite loop
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4.
Q4: What is the output of the following loop?
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int i = 0;
int total = 0;
while (i <= 50) {
   total += i;
   i += 5;
}
System.out.println(i);
  • 0 5 10 15 20 25 30 35 40 45 50
  • 0 5 10 15 20 25 30 35 40 45
  • 5 10 15 20 25 30 35 40 45 50
  • 5 10 15 20 25 30 35 40 45
  • 55
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5.
Q5: What is the value of counter after the execution of the folowing code?
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int counter = 0;
while (counter > 100) {
   if (counter % 2 == 1)
      System.out.println(counter + " is odd.");
   else
      System.out.println(counter + " is even.");
}
counter++;
System.out.println(counter);
  • 0
  • 1
  • 99
  • 100
  • 101
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