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Subgoals

Section 7.2 Loops-WE1-P1

Subgoals for Evaluating a Loop.

  1. Identify loop parts
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    1. Determine start condition
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    2. Determine update condition
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    3. Determine termination condition
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    4. Determine body that is repeated
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  2. Trace the loop
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    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.
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  • See diagram for answer A
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  • See diagram for answer B
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  • See diagram for answer C
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  • See diagram for answer D
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  • 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
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  • 9 8 7 6 5 4 3 2 1
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  • 9 8 7 6 5 4 3 2
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  • 10 9 8 7 6 5 4 3 2
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  • 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
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  • 10 9 8 7 6 5 4 3 2
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  • 10 9 8 7 6 5 4 3 2 1
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  • 1 2 3 4 5 6 7 8 9 10
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  • 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
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  • 0 5 10 15 20 25 30 35 40 45
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  • 5 10 15 20 25 30 35 40 45 50
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  • 5 10 15 20 25 30 35 40 45
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  • 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);
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