Relational operators in Java - Step-by-Step Execution

Concept Flow - Relational operators

Start

↓

Evaluate left operand

↓

Evaluate right operand

↓

Apply relational operator

↓

Result: true or false

↓

Use result in condition or output

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End

Relational operators compare two values and produce true or false, which can be used in conditions or printed.

Execution Sample

Java

int a = 5;
int b = 10;
boolean result = a < b;
System.out.println(result);

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

Execution Table

Step	Expression	Evaluation	Result
1	a = 5	Assign 5 to a	a = 5
2	b = 10	Assign 10 to b	b = 10
3	a < b	5 < 10	true
4	System.out.println(result)	Print value of result	true

💡 Program ends after printing the boolean result of the relational expression.

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 - 3 Insights

Why does the expression 'a < b' result in true?

Because at step 3 in the execution_table, 'a' is 5 and 'b' is 10, so 5 < 10 is true.

Can relational operators be used with variables of different types?

In Java, relational operators work with compatible types like int and double; types must be comparable as shown in the execution_table where both are int.

What type of value do relational operators return?

They return a boolean value (true or false), as seen in step 3 and stored in 'result'.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of 'result' after step 3?

A 5

B true

C false

D 10

💡 Hint

Check the 'Result' column in row with Step 3 in execution_table.

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

A Step 1

B Step 3

C Step 2

D Step 4

💡 Hint

Look at the 'Expression' and 'Evaluation' columns in execution_table for variable assignments.

If 'a' was 15 instead of 5, what would be the result of 'a < b' at step 3?

A false

B true

C 15

D 10

💡 Hint

Compare the values of 'a' and 'b' in the expression 'a < b' in execution_table step 3.

Concept Snapshot

Relational operators compare two values and return true or false.
Common operators: <, >, <=, >=, ==, !=
Used in conditions and expressions.
Operands must be compatible types.
Result is boolean.
Example: int a=5; int b=10; boolean res = a < b; // true

Full Transcript

This visual execution shows how relational operators work in Java. First, variables 'a' and 'b' are assigned values 5 and 10. Then the expression 'a < b' is evaluated by comparing 5 and 10, which results in true. This boolean result is stored in 'result' and printed. Relational operators always return true or false depending on the comparison. This is useful for making decisions in code.