View Compilation Error

0_0_35796652_22526\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) 
              ^
0_0_35796652_22526\Main.java:4: 错误: 需要class, interface或enum
        int k=1,n;
        ^
0_0_35796652_22526\Main.java:5: 错误: 需要class, interface或enum
        n=cin.nextInt();
        ^
0_0_35796652_22526\Main.java:6: 错误: 需要class, interface或enum
        while(n!=0)
        ^
0_0_35796652_22526\Main.java:9: 错误: 需要class, interface或enum
            num1=cin.nextBigInteger();
            ^
0_0_35796652_22526\Main.java:10: 错误: 需要class, interface或enum
            num2=cin.nextBigInteger();
            ^
0_0_35796652_22526\Main.java:11: 错误: 需要class, interface或enum
            System.out.println("Case "+ k++ +":");
            ^
0_0_35796652_22526\Main.java:12: 错误: 需要class, interface或enum
            System.out.println(num1 + " + " + num2 +" = " + num1.add(num2)); 
            ^
0_0_35796652_22526\Main.java:13: 错误: 需要class, interface或enum
            n--;
            ^
0_0_35796652_22526\Main.java:14: 错误: 需要class, interface或enum
        }
        ^
10 个错误