View Compilation Error

0_0_18704897_253\Main.java:1: 错误: 需要class, interface或enum
 main() 
 ^
0_0_18704897_253\Main.java:4: 错误: 需要class, interface或enum
    scanf("%d %d",&a,&b); 
    ^
0_0_18704897_253\Main.java:5: 错误: 需要class, interface或enum
    while(!(a==0&&b==0)) 
    ^
0_0_18704897_253\Main.java:8: 错误: 需要class, interface或enum
     scanf("%d %d",&a,&b); 
     ^
0_0_18704897_253\Main.java:9: 错误: 需要class, interface或enum
    } 
    ^
5 个错误