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Subgoals

Section 7.4 Loops-WE2-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 7.4.1

Exercises Exercises

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