What is wrong in this coding

Question

class swap
<static void main();
<int a=10;
int b=20:
a=20*1:
b=20/10:
system.out.println(""the number after swapping a=""+a);
system.out.println("the number after swapping b="+b);>>

Answer 1

You can use a temporary variable to swap.Also 20/10 does not give 10 it gives 2.
int a,b,temp;
//take input from user
temp=a;
a=b;
b=temp;
try this