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Subgoals

Section 7.11 Assessment: While and For Loops

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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Exercises Exercises

    1.

    Q1: What is printed as a result of executing the following code segment?
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    int k = 0;
while (k < 10) {
   System.out.print((k % 3) + " ");
   if ((k % 3) == 0)
      k = k + 2;
   else
      k++;
}
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    2.

    Q2: What are the first and last numbers printed by the following code segment?
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    int number = 15;
while (number < 28) {
   System.out.println(number);
   number++;
}
    • First: 15; Last: 27
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    • First: 15; Last: 28
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    • First: 16; Last: 27
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    • First: 16; Last: 28
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    • First: 16; Last: 29
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    3.

    Q3: What is printed as a result of executing the following code segment?
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    int alpha = 24;
int beta = 30;
while (beta != 0) {
   int rho = alpha % beta;
   alpha = beta;
   beta = rho;
}
System.out.println(alpha);
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    4.

    Q4: Considering the following code, which best describes what the code does?
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    int var = 0;
int num = 50;
for (int x = 1; x <= num; x += 2) {
   var = var + x;
}
System.out.println(var);
    • Prints the value in num
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    • Prints the sum of all the integers between 1 and num, inclusive
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    • Prints the sum of all even integers between 1 and num, inclusive
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    • Prints the sum of all odd integers between 1 and num, inclusive
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    • Nothing is printed, it is an infinite loop
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    5.

    Q5: What is printed as a result of executing the following code segment?
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    int typeA = 0;
int typeB = 0;
int typeC = 0;
for (int k = 1; k <= 50; k++) {
   if (k % 2 == 0 && k % 5 == 0)
      typeA++;
   if (k % 2 == 0)
      typeB++;
   if (k % 5 == 0)
      typeC++;
}
System.out.println("%d %d %d", typeA, typeB, typeC);
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