数据结构课程设计题目求解编写一个通讯录管理系统

Question

设计目的：用〈〈数据结构〉〉中的双向链表作数据结构，结合C语言基本知识。编写一个通讯录管理系统。以把所学数据结构知识应用到实际软件开发中去。
设计内容：本系统应完成一下几方面的功能：
1)输入信息——enter();
2)显示信息———display( );
3)查找以姓名作为关键字 ———search( );
4)删除信息———delete( );
5)存盘———save ( );
6)装入———load( ) ;
设计要求：
1)每条信息至包含 ：姓名（NAME ）街道（STREET）城市（CITY）邮编（EIP）国家（STATE）几项
2)作为一个完整的系统，应具有友好的界面和较强的容错能力

Answer 1

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<conio.h>

struct contacks
{ char name[10];
char street[20];
char city[10];
int eip;
char state[10];
}con[50];
int k=0;

void enter();
void display();
void lookandchange();
void del();
void save();

void main()
{
int a;
do
{

printf("\n\n ******************************************************************\n");
printf(" *"); printf("\t\twelcome enter the contacks system"); printf("\t*");
printf("\n ******************************************************************\n");

printf(" *"); printf("\t 1.Access information"); printf("\t\t\t\t\t*\n");
printf(" *"); printf("\t 2.display information"); printf("\t\t\t\t*\n");
printf(" *"); printf("\t 3.lookandchange information"); printf("\t\t\t\t*\n");
printf(" *"); printf("\t 4.Delete information"); printf("\t\t\t\t\t*\n");
printf(" *"); printf("\t 5.Save the information"); printf("\t\t\t\t*\n");
printf(" *"); printf("\t 6. exit "); printf("\t\t\t\t\t*\n");
printf(" ******************************************************************\n");

printf(" Enter you choice : ");
scanf("%d",&a);

switch(a)
{

case 1:printf("\n");enter();break;
case 2:printf("\n");display();break;
case 3:printf("\n");lookandchange();break;
case 4:printf("\n");del();break;
case 5:printf("\n");save();break;
case 6:printf("\n");exit(0);break;
default:printf("\nThe choice is between 1 to 6.\n");
}
}while(a!=0);

}

void enter()
{
char ch[20];

printf("\nenter student information:\n");
do
{ printf("\nname: ");
scanf("%s",con[k].name);
printf("street: ");
scanf("%s",con[k].street);
printf("\ncity: ");
scanf("%s",con[k].city);
printf("\neip: ");
scanf("%d",&con[k].eip);
printf("\nstate: ");
scanf("%s",con[k].state);
k++;
printf("\nif want continue input student information(y/n): ");
scanf("%s",ch);
}while(strcmp(ch,"y")==0||strcmp(ch,"Y")==0);
display();
}

void display()
{ int i;
printf(" the information is:\n");
for(i=0;i<k;i++)
{ printf("%10s %20s %10s %6d %10s ",con[i].name,con[i].street,con[i].city,con[i].eip,con[i].state);
printf("\n"); }
}

void lookandchange()

{
int i;
char a[20],ch[10];
printf("\nenter you want look name:");
scanf("%s",a);
for(i=0;i<k;i++)
if(strcmp(con[i].name,a)==0) printf("%10s %20s %10s %6d %10s ",con[i].name,con[i].street,con[i].city,con[i].eip,con[i].state);
printf("\nenter you want change name:");
scanf("%s",a);
for(i=0;i<k;i++)
{
if(strcmp(con[i].name,a)==0)
{ printf("\nyou sure want change student name(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0) { printf("\nname:"); scanf("%s",con[i].name);}
printf("\nyou sure want change street(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0) { printf("\nstreet"); scanf("%s",con[i].street);}
printf("\nyou sure want change city(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0) { printf("\ncity"); scanf("%s",con[i].city);}
printf("\nyou sure want change eip(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0) { printf("\neip"); scanf("%d",&con[i].eip);}
printf("\nyou sure want change state(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0) { printf("\nstate"); scanf("%s",con[i].state);}
}
}
display();
}

void del()
{
int i,j;
char c[20];
printf("\nenter you want delete name ：\n");
printf("name：");
scanf("%s",&c);
for(i=0;i<k;i++)
if(strcmp(c,con[i].name)==0) break;
for(j=i;j<=2;j++)
con[j]=con[j+1];
printf("\t\t\tyou had delete %s\n",c);
k--;
display();
}

void save()
{ FILE *fp; int i;
if((fp=fopen("xinxi.txt","w"))==NULL)
{ printf("cannot write the file.\n");
exit(0);}
for(i=0;strlen(con[i].name)!=0;i++)
fprintf(fp,"%s %s %s %d %s\n",con[i].name,con[i].street,con[i].city,con[i].eip,con[i].state);
fclose(fp);
}