运行 ID: 20845

Main.cc: In function ‘std::__cxx11::string add(std::__cxx11::string, std::__cxx11::string)’:
Main.cc:6:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(a1.size()=0;i--){
            ^~
Main.cc:8:12: note: suggested alternative: ‘i’
  for(int i=ai.size()-1;i>=0;i--){
            ^~
            i
Main.cc: In function ‘int main()’:
Main.cc:28:3: error: ‘coutMMans’ was not declared in this scope
   coutMMans.substr(0,3)<<","<