View Compilation Error

0_0_19059154_11393.cpp:3:12: error: 'a' does not name a type
            a=0;
            ^
0_0_19059154_11393.cpp:4:12: error: 'b' does not name a type
            b=0;
            ^
0_0_19059154_11393.cpp:5:12: error: 'Scanner' does not name a type
            Scanner reader =new Scanner(System.in);
            ^
0_0_19059154_11393.cpp:6:12: error: 'a' does not name a type
            a=reader.nextInt();
            ^
0_0_19059154_11393.cpp:7:12: error: 'b' does not name a type
            b=reader.nextInt();
            ^
0_0_19059154_11393.cpp:8:12: error: 'System' does not name a type
            System.out.println(a+b);
            ^