Numeric literal formats in Swift - Step-by-Step Execution

Concept Flow - Numeric literal formats

Start

↓

Read Numeric Literal

↓

Check Format

↓

Decimal

↓

Convert to Number Value

↓

Use in Code

↓

End

The program reads a numeric literal, checks its format (decimal, binary, octal, or hexadecimal), converts it to a number, and then uses it in the code.

Execution Sample

Swift

let decimal = 1234
let binary = 0b1001
let octal = 0o17
let hex = 0x1F

This code defines four numbers using different numeric literal formats in Swift.

Execution Table

Step	Literal	Format Detected	Conversion Result	Variable Assigned
1	1234	Decimal	1234	decimal = 1234
2	0b1001	Binary	9	binary = 9
3	0o17	Octal	15	octal = 15
4	0x1F	Hexadecimal	31	hex = 31
5	-	-	-	Execution ends after all literals processed

💡 All numeric literals converted and assigned to variables.

Variable Tracker

Variable	Start	After Assignment	Final
decimal	undefined	1234	1234
binary	undefined	9	9
octal	undefined	15	15
hex	undefined	31	31

Key Moments - 3 Insights

Why does 0b1001 become 9 and not 1001?

Because 0b prefix means binary format, so 1001 in binary equals 9 in decimal (see execution_table step 2).

What does 0o17 represent?

0o means octal format; 17 in octal equals 15 in decimal (see execution_table step 3).

How is 0x1F interpreted?

0x means hexadecimal; 1F in hex equals 31 in decimal (see execution_table step 4).

Visual Quiz - 3 Questions

Look at the execution_table, what is the decimal value of the binary literal 0b1001?

A 9

B 1001

C 11

D 8

💡 Hint

Check execution_table row 2 under Conversion Result.

At which step does the octal literal get converted?

A Step 2

B Step 3

C Step 1

D Step 4

💡 Hint

Look for 0o prefix in execution_table.

If the hex literal 0x1F was changed to 0x20, what would be the new decimal value?

A 31

B 30

C 32

D 16

💡 Hint

0x20 in hex equals 32 decimal; compare with execution_table step 4.

Concept Snapshot

Numeric literals in Swift can be decimal (e.g., 1234), binary (prefix 0b), octal (prefix 0o), or hexadecimal (prefix 0x).
Each format converts to a decimal number internally.
Use prefixes to specify the format.
Swift automatically converts these literals to their decimal values when assigned.

Full Transcript

This visual execution shows how Swift reads numeric literals in different formats: decimal, binary, octal, and hexadecimal. Each literal is detected by its prefix or lack thereof. The program converts each literal to its decimal equivalent and assigns it to a variable. For example, 0b1001 is binary and converts to 9 decimal. The octal literal 0o17 converts to 15 decimal. The hexadecimal 0x1F converts to 31 decimal. The variable tracker shows each variable's value after assignment. Key moments clarify why prefixes matter and how conversion works. The quiz tests understanding of these conversions and steps.