Comparison operators in Swift - Step-by-Step Execution

Concept Flow - Comparison operators

Start

↓

Evaluate Left Value

↓

Evaluate Right Value

↓

Apply Comparison Operator

↓

Result: true or false

↓

Use Result in Condition or Expression

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End

The program compares two values using a comparison operator and produces true or false as the result.

Execution Sample

Swift

let a = 5
let b = 10
let result = a < b
print(result)

This code compares if a is less than b and prints the Boolean result.

Execution Table

Step	Action	Evaluation	Result
1	Assign a = 5	a = 5	5
2	Assign b = 10	b = 10	10
3	Compare a < b	5 < 10	true
4	Assign result = true	result = true	true
5	Print result	print(true)	true

💡 Comparison done and result printed; program ends.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
a	undefined	5	5	5	5
b	undefined	undefined	10	10	10
result	undefined	undefined	undefined	true	true

Key Moments - 2 Insights

Why does the comparison a < b result in true?

Because at step 3 in the execution_table, a is 5 and b is 10, and 5 is less than 10, so the comparison returns true.

Is the result variable storing a number or a Boolean?

At step 4, result stores the Boolean value true, not a number, because comparison operators always return true or false.

Visual Quiz - 3 Questions

Look at the execution_table at step 3, what is the result of the comparison a < b?

A true

B false

C 5

D 10

💡 Hint

Check the 'Result' column at step 3 in the execution_table.

At which step is the variable 'result' assigned a value?

A Step 2

B Step 4

C Step 3

D Step 5

💡 Hint

Look at the 'Action' column for assignment to 'result' in the execution_table.

If we change 'a' to 15, what would be the result of 'a < b' at step 3?

A 15

B true

C false

D 10

💡 Hint

Compare 15 < 10 logically, referencing the evaluation in step 3.

Concept Snapshot

Comparison operators in Swift compare two values.
They return true or false.
Common operators: <, >, <=, >=, ==, !=.
Used in conditions and expressions.
Example: let result = a < b
Result is a Boolean.

Full Transcript

This visual execution shows how comparison operators work in Swift. First, variables a and b are assigned values 5 and 10. Then the comparison a < b is evaluated, which checks if 5 is less than 10. This returns true. The result variable stores this Boolean value. Finally, the program prints true. Comparison operators always return true or false, which can be used in conditions or stored in variables.