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Subgoals

Section 6.4 Loops-WE2-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

Subsection 6.4.1

Exercises Exercises

1.
    Q6: What is the value of total after the execution of the folowing code?
    int total = 0;
for (int x = 50; x >= 0; x -= 5) {
   total += x;
}
  • 50
  • 0
  • 5
  • 270
  • 275
2.
    Q7: What is the output of the following loop?
    for (int y = 0; y < 10; y++) {
   System.out.print(y * y + " ");
}
  • 0 1 4 9 16 25 36 49 64 81
  • 1 4 9 16 25 36 49 64 81
  • 1 4 9 16 25 36 49 64
  • 0 1 2 3 4 5 6 7 8 9 10
  • 1 2 3 4 5 6 7 8 9 10
3.
    Q8: What is the output of the following loop?
    for (int y = 100; y < 10; y--) {
   System.out.println(y);
}
  • 100
  • 10
  • 100 90 80 70 60 50 40 30 20
  • 100 90 80 70 60 50 40 30 20 10
  • no output produced
4.
Q9: What are the values of a and b after the folowing code executes?
int a = 0, b = 0;
for (int x = 1; x <= 15; x++) {
    if (x % 2 == 0)
        a += x;
    else
        b += x;
}
System.out.println("a is " + a);
System.out.println("b is " + b);
The value of a is and the value of b is .
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