Question

Chapter 6 Debugging Exercises - 

Problem 1
The programmer intends for this pseudocode to display three random numbers in the range of 1 through 7. According to the way we've been generating random numbers in the book; however, there appears to be an error. Assume that the random() function is a built-in library function. Correct the pseudocode so that the program works as it should (This has 1 error and is easy to spot)
//This program displays 3 random numbers in the range from 1 to 7.
    Declare Integer count
    //Display 3 random numbers
    For count = 1 to 3
        Display random(7,1)
    End For

Problem 2
This problem should return the amount of a discount to a main() module when the calcDiscountPrice() function is called. (This has 1 error and is pretty easy to spot.)
//The calcDiscountPrice funciton accepts an item's 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)
Function Real calcDiscountPrice(Real price, Real percentage)
    //Declarations
    Declare Real discount
    Declare Real discountPrice

    //Calculations
    discount = price * percentage
    discountPrice = price - discount
    
    //Return the discount amount
    Return discount

Problem 3
This problem should calculate and display 10% of any number given. Correct the pseudocode (a bit harder than the last 2 problems)
Module main()
    //Declarations
    Declare Real value, result
    
    //Get a value from the user
    Display "enter a value"
    Input value
    
    //Set 10% of the value
    result = tenPercent(value)
    
    //Display value
    Display "10 percent of ", value, " is ", result
End Module

//The tenPercent() function calculates and returns 10% of any number passed into it
Function Real tenPercent(Real num)
    //Declarations
    Declare Integer myResult
    
    //Calculations
    myResult = num * .10
    
    //Return the result
    Return myResult
    
End Function
    

Answer 1

CODE :

Modified code reason has been commented and kept in bold.

Problem - 1:

Module main() // Good way to start PseudoCode

Declare Integer count

    //Display 3 random numbers

    For count = 1 to 3

        Display Integer random(1,7) // Type has to be declared

    End For

End Module

___________________________________________________________________________________________

Problem - 2:

// Main Module

Module main()

        discount = Function Real calcDiscountPrice(Real price, Real percentage)  

// returned value has to be captured.

End Module

Function Real calcDiscountPrice(Real price, Real percentage)

    //Declarations

    Declare Real discount

    Declare Real discountPrice

    //Calculations

    discount = price * percentage

    discountPrice = price - discount

    

    //Return the discount amount

    Return discount

___________________________________________________________________________________________

Problem - 3:

Module main()

    //Declarations

    Declare Real value, result

    //Get a value from the user

    Display "enter a value"

    Input value

    //Set 10% of the value

    result = tenPercent(value)

    //Display value

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

End Module

//The tenPercent() function calculates and returns 10% of any number passed into it

Function Real tenPercent(Real num)

    //Declarations

    Declare Real myResult // Type has to be Real

    //Calculations

    myResult = num * .10

// Return the result

    Return myResult

    

End Function