View Compilation Error

0_0_36977475_9042.cpp: In function 'int main()':
0_0_36977475_9042.cpp:38:36: error: 'group' was not declared in this scope
                 cout << "Case " << group++ << ":" << endl;
                                    ^
0_0_36977475_9042.cpp:43:36: error: 'group' was not declared in this scope
                 cout << "Case " << group++ << ":" << endl;
                                    ^