What a computer does (input, process, output, store) in Intro to Computing - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the correct sequence of computer operations

Which of the following sequences correctly shows the main steps a computer performs when running a program?

A Input → Store → Process → Output

B Input → Process → Store → Output

C Process → Input → Store → Output

D Store → Input → Process → Output

💡 Hint

Think about when the computer saves data before working on it.

The computer first receives data (Input), then saves it temporarily (Store), processes it (Process), and finally shows the result (Output).

❓ trace

intermediate

Trace the output of a simple computer operation

Imagine a computer program that takes a number as input, doubles it, stores the result, and then outputs it. If the input is 7, what is the output?

Intro to Computing

input_number = 7
stored_value = input_number * 2
output = stored_value
print(output)

A 7

B Error

C 0

D 14

💡 Hint

Multiply the input by 2 before output.

The program doubles the input 7, so 7 × 2 = 14, which is stored and then output.

❓ identification

advanced

Identify which part of the computer handles storing data

Which component of a computer is primarily responsible for storing data temporarily during processing?

A Memory (RAM)

B Output device

C Input device

D Processor (CPU)

💡 Hint

Think about where data is kept while the computer is working on it.

Memory (RAM) temporarily stores data and instructions while the CPU processes them.

❓ Comparison

advanced

Compare input and output devices

Which of the following pairs correctly matches an input device with an output device?

A Microphone and Hard Drive

B Keyboard and Monitor

C Printer and Mouse

D Speaker and Scanner

💡 Hint

Input devices let you send data to the computer; output devices show or produce results.

A keyboard is used to input data, and a monitor displays output. Other pairs mix input and output incorrectly.

🚀 Application

expert

Determine the output after a series of computer operations

A computer program receives the input number 5. It stores the number, adds 3 to it during processing, then outputs the result. What is the output?

Intro to Computing

input_value = 5
stored_value = input_value
processed_value = stored_value + 3
output = processed_value
print(output)

A 3

B 5

C 8

D Error

💡 Hint

Add 3 to the stored input before output.

The program adds 3 to the stored input 5, resulting in 8, which is then output.

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