c++ - i want exit my code after tokenizing -

i want tokenize string space delimeter using following code:

int main(){ string str; string s; cout<<getcwd(null,0)<<endl;  cout<<"enter command"<<endl; cin>>str;  while (getline(cin, str, ' ') && str.size() != 100)   cin>>str;  return 0; } 

but want terminate code after taking input continuously taking inputs , not executing return 0 line ,what should user able give 100 characters input , after taking input user should terminate program.