public static void main(String[] args) {
		
		int a = 100;
		int b = 20;
		System.out.println("a = " +a+ ", b = " + b);
		
		int temp = a;
		a = b;
		b = temp;
		System.out.println("a = " +a+ ", b = " + b);
		
	}
}
//output:
a = 100, b = 20
a = 20, b = 100