Comparison operators in Kotlin - Step-by-Step Execution

Concept Flow - Comparison operators

Start

↓

Evaluate left operand

↓

Evaluate right operand

↓

Apply comparison operator

↓

Result: true or false

↓

Use result in condition or expression

↓

End

The program evaluates two values, compares them using an operator, and produces true or false as the result.

Execution Sample

Kotlin

fun main() {
    val a = 5
    val b = 3
    val result = a > b
    println(result)
}

This code compares two numbers and prints true if the first is greater than the second.

Execution Table

Step	Action	Evaluation	Result
1	Assign a = 5	a = 5	5
2	Assign b = 3	b = 3	3
3	Compare a > b	5 > 3	true
4	Assign result = true	result = true	true
5	Print result	println(true)	true

💡 Program ends after printing the comparison result.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 4	Final
a	undefined	5	5	5	5
b	undefined	undefined	3	3	3
result	undefined	undefined	undefined	true	true

Key Moments - 3 Insights

Why does the comparison a > b return true when a is 5 and b is 3?

Because 5 is greater than 3, the comparison a > b evaluates to true as shown in execution_table step 3.

What type of value does a comparison operator produce?

Comparison operators produce a Boolean value: true or false, as seen in the result variable in execution_table step 4.

Can comparison operators be used with variables that hold numbers?

Yes, comparison operators compare the values stored in variables, like a and b in steps 1 and 2, to produce 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 3

💡 Hint

Check the 'Result' column in execution_table row 3.

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 execution_table.

If we change b to 7, what would be the result of a > b at step 3?

A true

B 5

C false

D 7

💡 Hint

Compare values 5 and 7 using > operator as in execution_table step 3.

Concept Snapshot

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

Full Transcript

This lesson shows how Kotlin compares two values using comparison operators. The program assigns 5 to variable a and 3 to variable b. Then it compares if a is greater than b using the > operator. The comparison produces true because 5 is greater than 3. This true value is stored in the variable result and printed. Comparison operators always return true or false, which can be used in conditions or other expressions. The execution table traces each step: assigning variables, comparing values, storing the result, and printing it. The variable tracker shows how a, b, and result change during execution. Key moments clarify why the comparison returns true and what type of value it produces. The quiz tests understanding of the comparison result, assignment step, and effect of changing values.