/in/foo.cc:8:26: warning: missing terminating ' character
  cout<<"单价和数量:"';
                          ^
/in/foo.cc:8:26: error: missing terminating ' character
  cout<<"单价和数量:"';
                          ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:9:2: error: expected ';' before 'cin'
  cin>>a;
  ^~~
/in/foo.cc:11:7: error: expected '}' at end of input
  s=a*b;
       ^