INPUT and OUTPUT

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which line correctly reads a value from the user into the variable Number?

A INPUT Number

B INPUT = Number

2. Which line correctly displays the message Total is followed by the value in Total?

A OUTPUT "Total is ", Total

B OUTPUT "Total is ", "Total"

3. What is the best order for a program that asks a user for a mark?

A INPUT Mark then OUTPUT "Enter a mark"

B OUTPUT "Enter a mark" then INPUT Mark

4. True or false: INPUT Score stores the value the user types in the variable Score.

A True

B False

5. Which keyword shows a message or value on the screen?

A INPUT

B OUTPUT

Match the Pairs

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

Left column		Right column
1INPUT Number		ADisplays the message Total is followed by the value stored in Total
2OUTPUT "Total is ", Total		BINPUT must be followed by a variable name to store the value in, not a message. Use OUTPUT for the message, then INPUT Number.
3Prompt the user first so they know what to enter, then read their value		CTotal is in quotes so the word Total is displayed instead of the variable's value. Remove the quotes around Total.
4Show a variable's value on screen after a text label		DReads a value typed by the user and stores it in the variable Number
5INPUT "Enter a number"		EOUTPUT "Enter a number" INPUT Number
6OUTPUT "Total is ", "Total"		FOUTPUT "Total is ", Total

Definitions

INPUT and OUTPUT

Fill in the Blanks

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

_____ Number

______ "Total is ", Total

OUTPUT "Enter a number" INPUT ______ Total ← Total + Number

Total ← Total + Number OUTPUT "Total is ", _____

______ "Enter a mark" INPUT Mark Total ← Total + Mark

Spot the Error

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

Question 1

A DECLARE Number : INTEGER

B READ Number

C OUTPUT "You entered ", Number

Question 2

A OUTPUT "Enter a number"

B Number ← INPUT

C OUTPUT "Number is ", Number

Question 3

A OUTPUT Enter your age

B INPUT Age

C OUTPUT "Age is ", Age

Question 4

A OUTPUT "Enter first number"

B INPUT Num1

C OUTPUT "You typed " Num1

Question 5

A DECLARE Total : INTEGER

B Total ← 15

C OUTPUT "Total is ", "Total"

Answer Key

INPUT and OUTPUT

Section A: Quick Questions

A — INPUT Number

A — OUTPUT "Total is ", Total

B — OUTPUT "Enter a mark" then INPUT Mark

A — True

B — OUTPUT

Section B: Match the Pairs

INPUT Number → Reads a value typed by the user and stores it in the variable Number

OUTPUT "Total is ", Total → Displays the message Total is followed by the value stored in Total

Prompt the user first so they know what to enter, then read their value → OUTPUT "Enter a number" INPUT Number

Show a variable's value on screen after a text label → OUTPUT "Total is ", Total

INPUT "Enter a number" → INPUT must be followed by a variable name to store the value in, not a message. Use OUTPUT for the message, then INPUT Number.

OUTPUT "Total is ", "Total" → Total is in quotes so the word Total is displayed instead of the variable's value. Remove the quotes around Total.

Section C: Definitions

INPUT and OUTPUT — INPUT stores a value from the user in a variable, e.g. INPUT Number. OUTPUT shows a message or value on screen, e.g. OUTPUT "Total is ", Total. Prompt first so users know what to enter.

Section D: Fill in the Blanks

INPUT Number

OUTPUT "Total is ", Total

OUTPUT "Enter a number"
INPUT Number
Total ← Total + Number

Total ← Total + Number
OUTPUT "Total is ", Total

OUTPUT "Enter a mark"
INPUT Mark
Total ← Total + Mark

Section E: Spot the Error

B — Cambridge pseudocode uses the keyword INPUT to read a value into a variable. Line 2 should be INPUT Number.

B — INPUT is a keyword that comes first, followed by the variable name. It is not used on the right of an assignment. It should be INPUT Number.

A — A message to display must be inside double quotes. Without them the computer reads the words as variable names. It should be OUTPUT "Enter your age".

C — Items in an OUTPUT statement must be separated by commas. The comma is missing after the message. It should be OUTPUT "You typed ", Num1.

C — Putting Total in quotes outputs the word Total instead of the value stored in the variable. It should be OUTPUT "Total is ", Total.