Assessment: Sequential If-Statements

Section 5.9 Assessment: Sequential If-Statements

Subgoals for Evaluating Selection Statements.

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

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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if (level1 && level2 && level3)
   points += 5;

if (level1 || level2 || level3)
   points += 5;

if (level1)
   points += 5;
if (level2)
   points += 5;
if (level3)
   points += 5;

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I only
II only
III only
I and III
II and III

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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.

Number of Units 🔗	Discount 🔗
1 up to but not including 10 🔗	0 🔗
10 up to but not including 50 🔗	10% 🔗
50 or more 🔗	20% 🔗

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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if (numUnits >= 50)
   discount = 0.2;
if (numUnits >= 10)
   discount = 0.1;
if (numUnits > 0)
   discount = 0;

if (numUnits >= 50)
   discount = 0.2;
else if (numUnits >=10)
   discount = 0.1;
else
   discount = 0;

if (numUnits > 0)
   discount = 0;
if (numUnits > 10)
   discount = 0.1;
if (numUnits > 50)
   discount = 0.2;

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I only
II only
III only
I and III
II and III

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