Writing an IPO chart for a program

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Quick Questions

Shade in the A or B circle for each question.

1. A program asks for a student's name and two test marks, then shows their average. Which entry belongs in the Input column of the IPO chart?

A Average of the two marks

B Name, mark 1 and mark 2 entered by the user

2. In an IPO chart for a program that converts Celsius to Fahrenheit, where does 'multiply by 9/5 and add 32' go?

A Process column

B Output column

3. A program uses print() to show 'Total cost: $45.00'. Which IPO column lists this?

A Output

B Input

4. Which Process entry is written correctly for a program that decides if a student passes?

A If mark >= 50 then result is Pass, else result is Fail

B Ask the user to enter their mark

5. A requirement says: 'The program must display the total price including 10% GST.' Which IPO row matches this requirement?

A Input: total price | Process: none | Output: price

B Input: price | Process: price * 1.1 | Output: total price

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1name <- input("Enter name: ")		AAsking for a value is an input, not an output. It should be in the Input column, and Output should only list results or messages displayed.
2print("Total: ", total)		BA calculation has been placed in the Input column. It should be in the Process column, because Input only lists values the user enters.
3A Process row lists a calculation the program makes with the inputs		Ctotal <- price * quantity
4A Process row can also record a decision the program makes		DAn Output row in an IPO chart: the program displays a message and the result to the user
5Input column: total <- price * quantity		Eif mark >= 50 then result <- "Pass"
6Output column: ask the user for their age		FAn Input row in an IPO chart: the program asks the user to enter a name and stores it in a variable

Definitions

IPO chart

Fill in the Blanks

Complete each line of code by filling in the missing parts.

age = _____("Enter your age: ")

price = float(input("Price: ")) qty = int(input("Qty: ")) total = price * ___

total = price * qty print("Total cost: ", _____)

mark = int(input("Mark: ")) if mark __ 50: print("Pass")

name = input("Name: ") _____("Hello, " + name)

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A Requirement: show weekly pay

B Input: hours = input()

C Process: pay <- hours * 15

D Output: print(hours)

Question 2

A Input: age = input()

B Process: adult <- age <= 18

C Output: print(adult)

Question 3

A Input: c = input()

B Process: f <- c * 5 / 9 + 32

C Output: print(f)

Question 4

A Input: w, h, area

B Process: area <- w * h

C Output: print(area)

Question 5

A Input: mark = input()

B Process: pass <- mark >= 50

C Output: print(passed)

Answer Key

Writing an IPO chart for a program

Section A: Quick Questions

B — Name, mark 1 and mark 2 entered by the user

A — Process column

A — Output

A — If mark >= 50 then result is Pass, else result is Fail

B — Input: price | Process: price * 1.1 | Output: total price

Section B: Match the Pairs

name <- input("Enter name: ") → An Input row in an IPO chart: the program asks the user to enter a name and stores it in a variable

print("Total: ", total) → An Output row in an IPO chart: the program displays a message and the result to the user

A Process row lists a calculation the program makes with the inputs → total <- price * quantity

A Process row can also record a decision the program makes → if mark >= 50 then result <- "Pass"

Input column: total <- price * quantity → A calculation has been placed in the Input column. It should be in the Process column, because Input only lists values the user enters.

Output column: ask the user for their age → Asking for a value is an input, not an output. It should be in the Input column, and Output should only list results or messages displayed.

Section C: Definitions

IPO chart — A table with Input, Process and Output columns that lists what the user enters, the calculations and decisions the code makes, and the results or messages it displays.

Section D: Fill in the Blanks

age = input("Enter your age: ")

price = float(input("Price: "))
qty = int(input("Qty: "))
total = price * qty

total = price * qty
print("Total cost: ", total)

mark = int(input("Mark: "))
if mark >= 50:
    print("Pass")

name = input("Name: ")
print("Hello, " + name)

Section E: Spot the Error

D — The requirement is to show the weekly pay, so the Output row must print pay (the result of the process), not the hours the user entered. It should be print(pay).

B — An adult is someone aged 18 or over, so the decision must use >=. The broken line uses <=, which is true for people under 18.

B — The Celsius to Fahrenheit calculation multiplies by 9/5, not 5/9. The Process row must hold the correct calculation: f <- c * 9 / 5 + 32.

A — area is calculated in the Process row, so the user does not enter it. The Input row should only list the values the user enters: w, h.

C — The Output row must print a value that the Process row created. The process made pass, not passed, so it should be print(pass).