/in/foo.cc:2:12: error: expected unqualified-id before 'int'
 int numa=0,int numb=0;
            ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:4:41: error: 'numb' was not declared in this scope
     for(std::cin>>numa;numa!=0;numa/=10)numb=numb*10+numa%10;
                                         ^~~~
/in/foo.cc:5:16: error: 'numb' was not declared in this scope
     std::cout<<numb;
                ^~~~