Loops-WE1-P1

Section 7.2 Loops-WE1-P1

Subgoals for Evaluating a Loop.

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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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++;
}

See diagram for answer A
Incorrect
See diagram for answer B
Incorrect
See diagram for answer C
Correct
See diagram for answer D
Incorrect
See diagram for answer E
Incorrect

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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
Incorrect
9 8 7 6 5 4 3 2 1
Incorrect
9 8 7 6 5 4 3 2
Incorrect
10 9 8 7 6 5 4 3 2
Correct
compiler error
Incorrect

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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
Incorrect
10 9 8 7 6 5 4 3 2
Incorrect
10 9 8 7 6 5 4 3 2 1
Incorrect
1 2 3 4 5 6 7 8 9 10
Incorrect
infinite loop
Correct

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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
Incorrect
0 5 10 15 20 25 30 35 40 45
Incorrect
5 10 15 20 25 30 35 40 45 50
Incorrect
5 10 15 20 25 30 35 40 45
Incorrect
55
Correct

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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
Incorrect
1
Correct
99
Incorrect
100
Incorrect
101
Incorrect

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