View Compilation Error

0_0_29415438_18859\Main.java:2: 错误: 需要class, interface或enum
double f(double a);
^
0_0_29415438_18859\Main.java:3: 错误: 需要class, interface或enum
int main()
^
0_0_29415438_18859\Main.java:6: 错误: 需要class, interface或enum
    while(scanf("%lf", &a) != EOF)
    ^
0_0_29415438_18859\Main.java:9: 错误: 需要class, interface或enum
        printf("%.2lf\n", a);
        ^
0_0_29415438_18859\Main.java:10: 错误: 需要class, interface或enum
    }
    ^
0_0_29415438_18859\Main.java:12: 错误: 需要class, interface或enum
}
^
0_0_29415438_18859\Main.java:18: 错误: 需要class, interface或enum
    }
    ^
0_0_29415438_18859\Main.java:20: 错误: 需要class, interface或enum
}
^
8 个错误