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Subgoals

Section 5.9 Assessment: Sequential If-Statements

Subgoals for Evaluating Selection Statements.

  1. Diagram which statements go together
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  2. For if statement, determine whether expression is true or false
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  3. If true – follow true branch, if false – follow else branch or do nothing if no else branch
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Exercises Exercises

    1.

    Q1: A game has a series of three levels, but you only get the bonus points if you pass all three levels on the first try. Assume the following declarations:
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    boolean level1, level2, level3;
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    The variables indicate whether the level was passed on the first try (true indicates yes, false indicates no).
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    Which of the following code segments will properly update the points variable?
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    1. if (level1 && level2 && level3)
   points += 5;
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    2. if (level1 || level2 || level3)
   points += 5;
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    3. if (level1)
   points += 5;
if (level2)
   points += 5;
if (level3)
   points += 5;
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    2.

    Q2: A company offers a discount depending on the number of units of the product that are ordered:
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    Table 5.9.1.
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    Number of Units
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    Discount
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    1 up to but not including 10
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    10 up to but not including 50
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    10%
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    50 or more
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    20%
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    Assume that the variables numUnits, discount have been declared and have values.
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    Which of the following code segments will work as intended?
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    1. if (numUnits >= 50)
   discount = 0.2;
if (numUnits >= 10)
   discount = 0.1;
if (numUnits > 0)
   discount = 0;
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    2. if (numUnits >= 50)
   discount = 0.2;
else if (numUnits >=10)
   discount = 0.1;
else
   discount = 0;
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    3. if (numUnits > 0)
   discount = 0;
if (numUnits > 10)
   discount = 0.1;
if (numUnits > 50)
   discount = 0.2;
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