否
scanf(\"%d\
switch(choice1)
case 2:
case 5:
Student_Delete(); \t\t\t\tbreak;
是
case 1:
Student_C_MarkAverage();break; Student_M_MarkAverage();break;Student_E_MarkAverage();break;
choice1>5 || choice1<1
case 1:~case 3:
Student_C_MarkRanking();Student_Display();break;Student_M_MarkRanking();Student_Display();break;Student_E_MarkRanking();Student_Display();break;
开始
switch(choice3）
exit(0);\t\t\t\tbreak;
choice2>5 || choice2<1
Student_Modify(); \t\t\t\tbreak;
case 4:
switch(choice2)
printf(\"学生的总人数为:%d\\
Student_Insert(); \t\t\t\tbreak;
choice3>2 || choice3<1
while(1)
case 3:
case4：
Student_Select();\t\t\t\t\tbreak;
