Print function for output in Swift - Step-by-Step Execution

Concept Flow - Print function for output

Start

↓

Call print()

↓

Evaluate arguments

↓

Convert to string

↓

Send to console

↓

Output appears

↓

End

The print function takes values, converts them to text, and shows them on the console.

Execution Sample

Swift

print("Hello, world!")

This code prints the text Hello, world! to the console.

Execution Table

Step	Action	Input	Output
1	Call print()	"Hello, world!"	Prepare to print
2	Evaluate argument	"Hello, world!"	"Hello, world!" as string
3	Send to console	"Hello, world!"	Hello, world!
4	Finish		Output complete

💡 Print function completes after sending output to console.

Variable Tracker

Variable	Start	After print() call	Final

Key Moments - 2 Insights

Why does print("Hello, world!") show text on the screen?

Because print converts the input to a string and sends it to the console, as shown in execution_table step 3.

What happens if you print a number instead of text?

The number is converted to text and printed, similar to how the string is handled in execution_table step 2.

Visual Quiz - 3 Questions

Look at the execution_table, what is the output at step 3?

A "Hello, world!"

B Prepare to print

C Hello, world!

D Output complete

💡 Hint

Check the Output column in execution_table row for step 3.

At which step does the print function convert the input to a string?

A Step 2

B Step 3

C Step 1

D Step 4

💡 Hint

Look at the Action column in execution_table for the step mentioning conversion.

If you change the input to print(42), what changes in the execution_table?

A The input at step 2 changes to "42"

B The output at step 3 changes to 42

C The output at step 4 changes

D No changes at all

💡 Hint

Consider how numbers are converted to strings before printing, as in step 2.

Concept Snapshot

print(value) prints value to the console.
It converts the value to text first.
You can print strings, numbers, or variables.
Output appears immediately on the screen.
Use print() to check your program's progress.

Full Transcript

The print function in Swift shows text or values on the screen. When you call print with a value, it first converts that value to a string if needed. Then it sends that string to the console where you see it. For example, print("Hello, world!") prints Hello, world! on the screen. The steps are: call print, convert input to string, send to console, and finish. This helps you see what your program is doing. You can print text, numbers, or variables. The output appears right away in the console.