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Java Program: Demonstrate Increment and Decrement Operators

Java

public class IncrementDecrementDemo {
    public static void main(String[] args) {
 
        int a = 10;
        int b = 10;
 
        System.out.println("Initial value of a: " + a);
        System.out.println("Initial value of b: " + b);
 
        // Post-increment
        System.out.println("\nPost-increment (a++): " + (a++));
        System.out.println("Value of a after post-increment: " + a);
 
        // Pre-increment
        System.out.println("\nPre-increment (++a): " + (++a));
        System.out.println("Value of a after pre-increment: " + a);
 
        // Post-decrement
        System.out.println("\nPost-decrement (b--): " + (b--));
        System.out.println("Value of b after post-decrement: " + b);
 
        // Pre-decrement
        System.out.println("\nPre-decrement (--b): " + (--b));
        System.out.println("Value of b after pre-decrement: " + b);
    }
}

Output

 
OUTPUT :
Initial value of a: 10
Initial value of b: 10

Post-increment (a++): 10
Value of a after post-increment: 11

Pre-increment (++a): 12
Value of a after pre-increment: 12

Post-decrement (b--): 10
Value of b after post-decrement: 9

Pre-decrement (--b): 8
Value of b after pre-decrement: 8

Explanation

✅ 1. Increment Operators (++)

Operator	Meaning
a++	Use value first, then increase by 1
++a	Increase by 1 first, then use value

✅ Example:

int a = 10;

System.out.println(a++); // prints 10

System.out.println(a); // becomes 11

✅ 2. Decrement Operators (--)

Operator	Meaning
b--	Use value first, then decrease by 1
--b	Decrease by 1 first, then use value

✅ Example:

int b = 10;

System.out.println(b--); // prints 10

System.out.println(b); // becomes 9

✅ 3. Key Difference Summary

Expression	Output	Final Value
a++	Old value	+1
++a	New value	+1
b--	Old value	−1
--b	New value	−1

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Java Program: Demonstrate Increment and Decrement Operators

Output