What a computer does (input, process, output, store) in Intro to Computing - Flowchart & Logic Diagram

Process Overview

A computer takes information (input), works on it (process), shows the result (output), and saves data for later (store). This flow helps computers solve problems and help us every day.

Flowchart

Get Input

Yes No↓

Process Data

↓

Store Data

↓

Show Output

This flowchart shows the four main steps a computer follows: getting input, checking if input is valid, processing data, storing data, and showing output.

Step-by-Step Trace - 6 Steps

Step 1: Start and get input from user (e.g., typing numbers).

Step 2: Check if input is valid (is '5 + 3' a proper expression?).

Step 3: Process the input (calculate 5 + 3).

Step 4: Store the result in memory.

Step 5: Show the output to the user (display 8).

Step 6: End process.

Diagram

 +------------+      +------------+      +------------+      +------------+
 |   Input    | ---> |  Process   | ---> |   Store    | ---> |   Output   |
 +------------+      +------------+      +------------+      +------------+
       |                   |                   |                   |
       |                   |                   |                   |
   User types          Computer          Memory saves         Screen shows
   or sends data      calculates         the data             the result
                       result

This diagram shows the four main parts of what a computer does: input from the user, processing inside the computer, storing data in memory, and output shown on the screen.

Flowchart Quiz - 3 Questions

What is the first step a computer does when given a task?

A Get input from the user

B Show output on the screen

C Store data in memory

D Process the data

Key Result

A computer works by taking input, checking it, processing it, storing results, and then showing output in a clear step-by-step flow.

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