Please submit your corrections to the debugging exercises in Chapters 6 and 7

Chapter 6 - page 264,

1. The programmer intends for this pseudocode to display three random numbers in

the range of 1 through 7. According to the way weve been generating random

numbers in this book, however, there appears to be an error. Can you find it?

// This program displays three random numbers

// in the range of 1 through 7.

Declare Integer count

// Display three random numbers.

For count = 1 To 3

Display random(7, 1)

End For

2. Can you find the reason that the following pseudocode function does not return

the value indicated in the comments?

// The calcDiscountPrice function accepts an items price and

// the discount percentage as arguments. It uses those

// values to calculate and return the discounted price.

Function Real calcDiscountPrice(Real price, Real percentage)

// Calculate the discount.

Declare Real discount = price * percentage

// Subtract the discount from the price.

Declare Real discountPrice = price discount

// Return the discount price.

Return discount

End Function

3. Can you find the reason that the following pseudocode does not perform as indicated

in the comments?

// Find the error in the following pseudocode.

Module main()

Declare Real value, result

// Get a value from the user.

Display "Enter a value."

Input value

// Get 10 percent of the value.

Call tenPercent(value)

// Display 10 percent of the value.

Display "10 percent of ", value, " is ", result

End Module

// The tenPercent function returns 10 percent

// of the argument passed to the function.

Function Real tenPercent(Real num)

Return num * 0.1

End Function

Chapter 7 - page 280.

1. Why does the following pseudocode not perform as indicated in the comments?

// This program asks the user to enter a value

// between 1 and 10 and validates the input.

Declare Integer value

// Get a value from the user.

Display "Enter a value between 1 and 10."

Input value

// Make sure the value is between 1 and 10.

While value < 1 AND value > 10

Display "ERROR: The value must be between 1 and 10."

Display "Enter a value between 1 and 10."

Input value

End While

2. Why does the following pseudocode not perform as indicated in the comments?

// This program gets a dollar amount from the user

// and validates the input.

Declare Real amount

// Get the amount from the user.

Display "Enter a dollar amount"

Input amount

// Make sure the amount is not less than zero. If it is,

// get a new amount from the user.

While amount < 0

Display "ERROR: The dollar amount cannot be less than 0."

Display "Enter a dollar amount."

End While

3. The following pseudocode works, but it performs a case-sensitive validation of the

users input. How could the algorithm be improved so the user does not have to

pay attention to capitalization when entering a name?

// This program asks the user to enter a string

// and validates the input.

Declare String choice

// Get the user's response.

Display "Cast your vote for Chess Team Captain."

Display "Would you like to nominate Lisa or Tim?"

Input choice

// Validate the input.

While choice != "Lisa" AND choice != "Tim"

Display "Please enter Lisa or Tim."

Display "Cast your vote for Chess Team Captain."

Display "Would you like to nominate Lisa or Tim?"

Input response

End While