View Compilation Error

0_0_24900040_24954.cpp: In function 'int main()':
0_0_24900040_24954.cpp:14:24: error: 'strlen' was not declared in this scope
       int alen=strlen(a);
                        ^
0_0_24900040_24954.cpp:36:22: error: no match for 'operator++' (operand type is 'std::ostream {aka std::basic_ostream<char>}')
       cout<<"Case "<<++cout<<":"<<endl;
                      ^