What a computer does (input, process, output, store) in Intro to Computing - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is input in a computer system?

Input is the data or instructions given to a computer to work on. It is like giving ingredients to a chef before cooking.

beginner

Explain processing in a computer.

Processing is when the computer takes the input and works on it to produce a result. It's like the chef mixing and cooking the ingredients.

beginner

What does output mean in computing?

Output is the result produced by the computer after processing input. Like a cooked meal served to you after cooking.

beginner

What is the role of storage in a computer?

Storage is where the computer saves data and instructions for later use. Like a pantry where ingredients are kept until needed.

beginner

List the four main steps a computer does with data.

The four main steps are: Input (getting data), Process (working on data), Output (showing results), and Store (saving data).

Which part of a computer system is responsible for taking data from the user?

A Process

B Output

C Input

D Storage

Input is the step where the computer receives data or instructions from the user.

What does the computer do during the processing step?

A Receives data from the keyboard

B Shows results to the user

C Saves data for later

D Works on the input data to create output

Processing means the computer works on the input data to produce a result.

Which step is like a chef serving a cooked meal?

A Input

B Output

C Process

D Store

Output is the result shown to the user, like serving a cooked meal.

Where does a computer keep data for future use?

A Storage

B Processor

C Output devices

D Input devices

Storage is where data is saved for later use.

Which of these is NOT one of the four main computer steps?

A Print

B Process

C Output

D Input

Print is an output method but not one of the four main steps: Input, Process, Output, Store.

Describe the four main things a computer does with data using a real-life analogy.

Think about how a chef receives ingredients, cooks, serves, and stores food.

Explain why storage is important in a computer system.

Consider what happens if you lose your ingredients before cooking.

Practice

1. Which of the following best describes the process step in what a computer does?

easy

A. The computer performs calculations or actions on the input data.

B. The computer shows the final result on the screen.

C. The computer receives data from the keyboard or mouse.

D. The computer saves data to a hard drive or memory.

Solution

1. Step 1: Understand the role of processing

   Processing means the computer works on the input data, like mixing ingredients in cooking.

2. Step 2: Differentiate from other steps

   Input is receiving data, output is showing results, and storage is saving data. Processing is the action in between.

3. Final Answer:

   The computer performs calculations or actions on the input data. -> Option A

4. Quick Check:

   Process = perform actions [OK]

Hint: Process means the computer works on input data [OK]

Common Mistakes:

• Confusing output with process
• Thinking input is processing
• Mixing storage with processing

2. Which of the following is the correct order of steps a computer follows?

easy

A. Process -> Store -> Input -> Output

B. Output -> Input -> Store -> Process

C. Input -> Process -> Output -> Store

D. Store -> Output -> Input -> Process

Solution

1. Step 1: Recall the four main steps

   The computer first takes input, then processes it, shows output, and finally stores data.

2. Step 2: Match the correct sequence

   Input -> Process -> Output -> Store matches the correct order: Input -> Process -> Output -> Store.

3. Final Answer:

   Input -> Process -> Output -> Store -> Option C

4. Quick Check:

   Order = Input, Process, Output, Store [OK]

Hint: Remember: Input first, then process, output, and store last [OK]

Common Mistakes:

• Mixing output before input
• Putting store before process
• Confusing the order of steps

3. Look at this flowchart of a computer task:

What is the correct output if the input is 5 and the process doubles the number?

medium

A. 10

B. 5

C. 25

D. 0

Solution

1. Step 1: Identify the input and process

   The input is 5, and the process doubles it, so 5 x 2 = 10.

2. Step 2: Determine the output

   The output is the result of the process, which is 10.

3. Final Answer:

   10 -> Option A

4. Quick Check:

   Input 5 doubled = 10 [OK]

Hint: Output is processed input, here double 5 = 10 [OK]

Common Mistakes:

• Using input value as output without processing
• Squaring input instead of doubling
• Choosing zero as output by mistake

4. A student wrote this sequence for a computer task:
Input -> Output -> Process -> Store
What is wrong with this order?

medium

A. Input should come after storing data.

B. Storing data should happen before input.

C. Processing should be last step.

D. Output comes before processing the input.

Solution

1. Step 1: Review correct step order

   The correct order is Input -> Process -> Output -> Store.

2. Step 2: Identify the error in given order

   Output is shown before processing, which is incorrect because output depends on processing.

3. Final Answer:

   Output comes before processing the input. -> Option D

4. Quick Check:

   Output must follow processing [OK]

Hint: Output must come after processing input [OK]

Common Mistakes:

• Thinking output can come before processing
• Confusing storage with input
• Believing processing is last step

5. Imagine you want to create a simple calculator program that adds two numbers. Which sequence correctly shows what the computer does?

hard

A. Store numbers -> Input numbers -> Process addition -> Output result

B. Input numbers -> Process addition -> Output result -> Store result

C. Output result -> Input numbers -> Process addition -> Store result

D. Process addition -> Input numbers -> Store result -> Output result

Solution

1. Step 1: Understand the calculator steps

   The computer first takes input numbers, then adds them (process), shows the result (output), and finally saves the result (store).

2. Step 2: Match the correct sequence

   Input numbers -> Process addition -> Output result -> Store result matches this order perfectly: Input -> Process -> Output -> Store.

3. Final Answer:

   Input numbers -> Process addition -> Output result -> Store result -> Option B

4. Quick Check:

   Calculator steps = Input, Process, Output, Store [OK]

Hint: Calculator: input numbers, add, show, then save [OK]

Common Mistakes:

• Trying to output before input
• Storing before processing
• Mixing order of steps