View Compilation Error

0_0_35681483_32223.cpp: In function 'int main()':
0_0_35681483_32223.cpp:20:6: error: 'sum' was not declared in this scope
      sum++;
      ^
0_0_35681483_32223.cpp:24:30: error: 'sum' was not declared in this scope
    cout<<"Case "<<num<<": "<<sum<<endl;
                              ^
0_0_35681483_32223.cpp: At global scope:
0_0_35681483_32223.cpp:28:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_35681483_32223.cpp:29:1: error: expected declaration before '}' token
 }
 ^