关于C语言课题设计（学生信息管理系统）

答案：#include"stdio.h"
 #include"stdlib.h"
 #include"string.h"
 #include"conio.h"
 typedef struct Student
 {char name[20];
 char num[20];
 int score;
  Student *next;
 }student;
 student *creat()
 {student *head;student *p,*s;int flag=1;
 head=(student*)malloc(sizeof(student));p=(student*)malloc(sizeof(student));
 head->next=p;
 if(!p){printf("失败");return 0;}
  
printf("输入姓名:");gets(p->name);
 printf("输入学号:");scanf("%s",p->num);
 printf("输入成绩：");scanf("%d",&p->score);
 while(flag)
 {s=(student*)malloc(sizeof(student));
 getchar();
 printf("输入姓名:(输入0退出):");gets(s->name);
 if(!strcmp(s->name,"0")){flag=0;break;}
 printf("输入学号:");scanf("%s",s->num);
 printf("输入成绩：");scanf("%d",&s->score);
 p->next=s;
 p=s;
 }
 p->next=NULL;
 return head;
 }
 void listprint(student *head)
 {student *p;
 p=head->next;
 while(p)
 {printf("姓名:%s\
学号:%s\
成绩：%d\
",p->name,p->num,p->score);
 p=p->next;
 }
 }
 void listfind(student *head,char str[])
 {student *p;p=head->next;
 if(p)
 {
 while(p&&(strcmp(p->name,str)&&strcmp(p->num ,str)))
 p=p->next;
  
if(p){ printf("姓名:%s\
学号:%s\
成绩：%d\
",p->name,p->num,p->score);}
 else printf("没有该学生信息！\
");
 }
 }
 void listadd(student *head)
 {student *p,*s;int flag=1;
 p=head->next;
 while(p->next!=NULL)p=p->next;
 while(flag)
 {s=(student*)malloc(sizeof(student));
  
printf("输入姓名:(输入0退出):");gets(s->name);
 if(!strcmp(s->name,"0")){ flag=0;break;}
 printf("输入学号:");scanf("%s",s->num);
 printf("输入成绩：");scanf("%d",&s->score);
 p->next=s;
 p=s;
 getchar();
 }
 p->next=NULL;
 }
 void listdel(student *head,char str[])
 {student *p1,*p2;p2=head;
 p1=head->next;
 while(p1&&(strcmp(p1->name,str)&&strcmp(p1->num ,str)))
 {p2=p1;p1=p1->next;}
 if(!p1)printf("\
\
\
\
\\t
没有该学生的信息\
");
 else  {p2->next=p1->next;printf("\
\
\
\
\
\\t\\t\\t\\t
 删除成功！\
\
");free(p1);}
 }
 void listsort(student *head)
 {student *p1,*p2,*p3,*p4,*temp;temp=(student *)malloc(sizeof(student));
 p1=p2=head->next;
  for(;p1!=NULL;p1=p1->next)
 {p2=p3=p1;p4=p3;
 for(;p3!=NULL;p3=p3->next)
 {
 if(p3->score>p4->score){p4=p3;}
 }strcpy(temp->name,p2->name);strcpy(temp->num,p2->num);temp->score=p2->score;
 strcpy(p2->name,p4->name);strcpy(p2->num,p4->num);p2->score=p4->score;
 strcpy(p4->name,temp->name);strcpy(p4->num,temp->num);p4->score=temp->score;}}
  
void menu()
 {printf("\
\
\
\
\\t\\t\\t菜单\
\\t\\t\\t\
\\t\\t\\t请选择\
\\t\\t\\t********************\
\\t\\t\\t*1创建资料\
\\t\\t\\t*2查找\
\\t\\t\\t*3显示全部\
\\t\\t\\t*4添加\
\\t\\t\\t*5删除\
\\t\\t\\t*6排名\
\\t\\t\\t*7退出\
\\t\\t\\t********************\
");
 }
  
  
   int main()
 {student *head;char str[20],ch; int count=0;
  
while(1)
 {menu();ch=getch();
 system("cls");
 if(ch!='1'&&ch!='7'&&count==0){printf("\
\
\
\
\
\
\\t\\t\\t
 你还没有创建资料\
");printf("\
\\t\\t
  
  
 按任意键回主菜单\
");getch();system("cls");continue;}
 else count=1;
 switch(ch)
 {case '1':head=creat();break;
 case '2':printf("输入要查找的姓名或学号：");gets(str);listfind(head,str);break;
 case '3':listprint(head);break;
 case '4':listadd(head);break;
 case '5':printf("输入要删除的姓名或学号：");gets(str);listdel(head,str);break;
 case '6':listsort(head);listprint(head);break;
 case '7':printf("\
\
\
\
\
\
\\t\\t\\t
  谢谢使用\
\
\
\
\
");getchar();return 0;
 }printf("\
\\t\\t
   按任意键回主菜单\
");getch();system("cls");
 }
  
}

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