include stdio standard input output printf void main number=num
scanf char int float double getchar putchar first second result grade
age sex gender operator line local row sum string paramter project=proj
precision point pointer variable long short page price amount height high
width level length define minutes product flush-fflush refresh if else case
switch score discount total size sizeof cost pay area rate data default
constant console column=col remainder expression calculate=calc syntax
computer symbol step source loop even number odd number while
digits up low others square start star end for break continue array
employee=emp max min point pointer student=stu find search insert delete =del
address =addr enter press value convert index password=pwd change datatype
array rate student pointer number value function globle exit display
show random scope power auto static format increment scope department=dpt
string initial=init alert warn struct tab
IDE(integrated Development Environment)
descending order
ascending order 升序