1extern int getch(); 2extern int class(); 3 4int 5token() 6{ 7 int state = 1; 8 9 while (1) { 10 int c=0; 11 c = getch(); 12 switch (state) { 13 case 1: break; 14 case 4: break; 15 case 5: break; 16 case 6: 17 { 18 switch (class(c)) { 19 default: break; 20 } 21 } break; 22 case 7: break; 23 } 24 } 25} 26 27