C++学生信息管理系统V1（课后作业）

1. #include <iostream>
2. #include <cstring>
3. #include <bits/stdc++.h>//C++万能头文件
4. #include <algorithm>
5. #include <cstdlib>
6. using namespace std;
7. int a,j;//j表学生数量，a计数
8. void menu()
9. {
10. cout<<"============================"<<endl;
11. cout<<"|"<<" 学生管理系统V1_By李康 "<<"|"<<endl;
12. cout<<"|"<<" 1:增加学生信息 "<<"|"<<endl;
13. cout<<"|"<<" 2:删除学生信息 "<<"|"<<endl;
14. cout<<"|"<<" 3:查找学生信息 "<<"|"<<endl;
15. cout<<"|"<<" 4:修改学生信息 "<<"|"<<endl;
16. cout<<"|"<<" 5:对学生信息排序 "<<"|"<<endl;
17. cout<<"|"<<" 6:显示学生的信息 "<<"|"<<endl;
18. cout<<"|"<<" 0:退出程序 "<<"|"<<endl;
19. cout<<"============================"<<endl;
20. cout<<"请输入："<<endl;
21. }
22. class Stu{
23. public:
24. void add();
25. void delect();
26. void look();
27. void change();
28. void show();
29. void sort();
30. private:
31. long long num;
32. char name[100];
33. char sex[50];
34. float score;
35. }st[101];
36. void Stu::add(){
37. //int j;
38. cout<<"输入学生人数:";
39. cin>>j;
40. cout<<"请依次输入学生的姓名,学号,性别和成绩^_^"<<endl;
41. for(a=0;a<j;a++)
42. {
43. cin>>st[a].name>>st[a].num>>st[a].sex>>st[a].score;
44. }
45. cout<<"输入完毕!"<<endl;
46. }
47. void Stu::delect(){
48. string str;
49. int b;
50. cout<<"输入要删除的学生姓名："<<endl;
51. cin>>str;
52. for(a=0;a<j;a++)
53. {
54. if(str==st[a].name) b=a;
55. break;
56. }
57. for(int m=b+1;m<j;j++)
58. st[m-1]=st[m];
59. cout<<"已成功删除！"<<endl;
60. j-=1;//学生减少一个
61. }
62. void Stu::look(){
63. cout<<"请输入要查找学生的学号:"<<endl;
64. int x,k=0;
65. cin>>x;
66. for(a=0;a<j;a++)
67. {
68. if(st[a].num==x)
69. {
70. cout<<" "<<st[a].name<<" "<<st[a].num<<" "<<st[a].sex<<" "<<st[a].score<<endl;
71. k++;break;
72. }
73. }
74. if(k==0) cout<<"Sorry!查无此人..."<<endl;
75. }
76. void Stu::change(){
77. int q,choi;
78. char nname[50],nsex[50];
79. float nscore;
80. cout<<"请输入要修改的同学的学号："<<endl;
81. cin>>q;
82. for(a=0;a<j;a++)
83. {
84. if(q==st[a].num) break;
85. }
86. cout<<"请选择："<<endl;
87. cout<<"1:修改姓名"<<endl<<"2:修改性别"<<endl<<"3:修改成绩"<<endl;
88. cin>>choi;
89. if(choi==1)
90. {
91. cout<<"请输入修改后的姓名：";
92. cin>>nname;
93. strcpy(st[a].name,nname);
94. }
95. else if(choi==2)
96. {
97. cout<<"请输入修改后的性别：";
98. cin>>nsex;
99. strcpy(st[a].sex,nsex);
100. //st[a].sex=nsex;
101. }
102. else if(choi==3)
103. {
104. cout<<"请输入修改后的成绩：";
105. cin>>nscore;
106. st[a].score=nscore;
107. }
108. cout<<"已成功修改信息!"<<endl;
109. }
110. void Stu::show(){
111. cout<<"结果为："<<endl;
112. for(a=0;a<j;a++)
113. {
115. cout<<st[a].name<<" "<<st[a].num<<" "<<st[a].sex<<" "<<st[a].score<<endl;
116. }
117. }
118. void Stu::sort(){
119. cout<<"程序正在以成绩进行排序,请稍等..."<<endl;
120. cout<<"排序出错！该功能将在下一版本中更新^_^"<<endl;
121. }
122.  
123. int main()
124. {
125. int i,n;
126. Stu student;
127. while(1)
128. {
129. i=0;
130. menu();
131. cin>>n;
132. switch(n)
133. {
134. case 1:
135. student.add();break;
136. case 2:
137. student.delect();
138. student.show();
139. break;
140. case 3:
141. student.look();break;
142. case 4:
143. student.change();
144. student.show();
145. break;
146. case 5:
147. student.sort();break;
148. case 6:
149. student.show();break;
150. case 0:
151. i=1;break;
152. default:
153. cout<<"请输入0-5的数字!"<<endl;
154. }
155. if(i==1) break;
156. cout<<"按任意键返回菜单！"<<endl;
157. getchar();
158. getchar();
159. system("cls");
160. }
161. return 0;
162. }