foo.cpp: In function 'int main()':
foo.cpp:12:3: error: 'cs' was not declared in this scope
   cs++;
   ^
foo.cpp:17:3: error: 'bs' was not declared in this scope
   bs=bs*10%cs;
   ^
foo.cpp:17:12: error: 'cs' was not declared in this scope
   bs=bs*10%cs;
            ^
foo.cpp:21:3: error: 'bs' was not declared in this scope
   bs=bs*(1000%cs)%cs;
   ^
foo.cpp:21:15: error: 'cs' was not declared in this scope
   bs=bs*(1000%cs)%cs;
               ^
foo.cpp:23:11: error: 'bs' was not declared in this scope
  cout<<(x+bs*m)%n;
           ^