Predict the output of the following Java program code snippet:

int a=1,b=2,c=3;
switch(p)
{
case 1: a++;
case 2: ++b;
break;
case 3: c--;
}
System.out.println(a + ","
+ b + "," +c);

(i) p = 1

2,3,3

Working

When p is 1, case 1 is matched. a++ increments value of a to 2. As there is no break statement, fall through to case 2 happens. ++b increments b to 3. break statement in case 2 transfers program control to println statement and we get the output as 2,3,3.

(ii) p = 3

1,2,2

Working

When p is 3, case 3 is matched. c-- decrements c to 2. Program control moves to the println statement and we get the output as 1,2,2.