Functions (reusable code blocks) in Intro to Computing - Flowchart & Logic Diagram

Process Overview

A function is like a small machine inside a program that does a specific job. You can use it many times without rewriting the same steps. This flowchart shows how a program calls a function, the function runs its steps, and then the program continues.

Flowchart

Call Function

↓

Enter Function

↓

Execute Function Steps

Yes No↓

Return Result

↓

Continue Main Program

This flowchart shows the process of calling a function, executing its steps, checking if it is done, returning the result, and continuing the main program.

Step-by-Step Trace - 6 Steps

Step 1: Start the program and call the function named 'greet'.

Step 2: Enter the function 'greet' and start executing its steps.

Step 3: Execute the function steps: print 'Hello, friend!'.

Step 4: Check if the function has completed all its steps.

Step 5: Return from the function to the main program.

Step 6: Continue executing the main program after the function call.

Diagram

Main Program
+----------------+
|                |
| Call 'greet'   |
|                |
+--------+-------+
         |
         v
+----------------+
| Function 'greet'|
| - Print message |
+----------------+
         |
         v
+----------------+
| Return control  |
+----------------+

This diagram shows the main program calling the function 'greet', the function printing a message, and then returning control back to the main program.

Flowchart Quiz - 3 Questions

What happens when a function is called in a program?

A The function deletes the program.

B The program stops running completely.

C The program runs the code inside the function.

D The program ignores the function.

Key Result

Functions let programs reuse code by running a set of instructions whenever needed, making programs easier to write and understand.