switch statement in java

/* switch*/

class arithmatic
{
public static void main(String args[])
{
int a=100;
float b=3,c;
switch(4)
{
case 1:
{
c=a+b;
System.out.println("sum :"+c);
break;
}
case 2:
{
c=a-b;
System.out.println("subtraction :"+c);
break;
}
case 3:
{
c=a*b;
System.out.println("multiplication :"+c);
break;
}
case 4:
{
c=a/b;
System.out.println("division :"+c);
break;
}
case 5:
{
c=a%b;
System.out.println("modular :"+c);
break;
}
default:
{

}
}
}
}


output :

 division :33.333332