exit               27 cond.c             exit(1);
exit               38 cond.c         	exit(1);
exit               40 cond.c         	exit(1);
exit              141 control.c      			exit(1);
exit              145 control.c      			exit(1);
exit               27 divide.c           	exit(1);
exit               30 divide.c       	exit(1);
exit               64 divide.c       	  exit(1);
exit               68 divide.c       	  exit(1);
exit               75 divide.c       	  exit(1);
exit               78 divide.c       	  exit(1);
exit               87 divide.c       	exit(1);