C语言课程设计报告_简单通讯录系统|c语言程序代码编程小程序设计|c语言课程设计报告课程案例
/*简单通讯录*/#include
#include struct address{ char name[20]; char street[20]; char city[10]; char state[10]; char zip[7]; struct address *next; struct address *prior; }list_entry;
struct address *start;struct address *last;
void enter();void display();void search();void save();void load();void list();
struct address *find(char *name);struct address *dls_store(struct address *,struct address *);
main(){clrscr();start=last=NULL;load();for (;;){ switch(menu_select()){ case 1:enter();break; case 2:delete();break; case 3:list();break; case 4:search();break; case 5:save();break; case 6:exit(0); } }}
menu_select(){char c;printf("1.Enter\n");printf("2.Delete\n");printf("3.List\n");printf("4.Search\n");printf("5.Save\n");printf("6.Quit\n");do{ printf("\nEnter you choice:"); c=getche(); }while (c<'0'||c>'6');return c-48;}
void enter(){struct address *info;for (;;){ info=(struct address *)malloc(sizeof(list_entry)); if (!info){ printf("\nout of memory"); return; } inputs("\nenter name:",info->name,19); if (!info->name[0]) break; inputs("enter street:",info->street,19); inputs("enter city:",info->city,9); inputs("enter state:",info->state,9); inputs("enter zip:",info->zip,6); start=dls_store(info,start); }}
inputs(char *prompt,char *s,int count){char p[255];do{ printf(prompt); gets(p); if (strlen(p)>count) printf("\ntoo long\n"); }while (strlen(p)>count); strcpy(s,p);}
struct address *dls_store(struct address *i,struct address *top){struct address *old,*p;if (last==NULL){ i->next=NULL; i->prior=NULL; last=i; return i; }p=top;old=NULL;while(p){ if (strcmp(p->name,i->name)<0){ old=p;p=p->next; } else{ if(p->prior){ p->prior->next=i; i->next=p; i->prior=p->prior; p->prior=i; return top; } i->next=p; i->prior=NULL; p->prior=i; return i; } } old->next=i; i->next=NULL; i->prior=old; last=i; return start;}
delete(){struct address *info;char s[80];printf("enter name:");gets(s);info=find(s);if (info) { if (start==info){ start=info->next; if (start) start->prior=NULL; else last=NULL; } else{ info->prior->next=info->next; if(info!=last) info->prior->next=info->prior; else last=info->prior; } free(info); }}
struct address *find(char *name){struct address *info;info=start;while(info){ if(!strcmp(name,info->name)) return info; info=info->next; }printf("name not found\n");return NULL;}
void list(){struct address *info;info=start;printf("\n%-20s%-20s%-10s%-10s%-6s\n", "姓名","街道","城市","省","邮编");while(info){ display(info); info=info->next; }printf("\n\n");}
void display(struct address *info){printf("%-20s%-20s%-10s%-10s%-6s\n", info->name,info->street,info->city,info->state,info->zip);}
void search(){char name[40];struct address *info,*find();printf("enter name to find:");gets(name);info=find(name);if(!info) printf("not found\n");else display(info);}
void save(){struct address *info;FILE *fp;if((fp=fopen("mlist","wb"))==NULL){ printf("can not open file\n"); exit(1); }printf("\nSaving file\n");info=start;while(info){ fwrite(info,sizeof(struct address),1,fp); info=info->next; }fclose(fp);}
void load(){struct address *info,*temp=NULL;FILE *fp;if((fp=fopen("mlist","rb"))==NULL){ printf("can not open file\n"); return; }while(start){ info=start->next; free(info); start=info; }printf("\nLoading file\n");start=(struct address *)malloc(sizeof(struct address));if(!start){ printf("out of memory!\n"); return; }info=start;while(!feof(fp)){ if(1!=fread(info,sizeof(struct address),1,fp)) break; info->next=(struct address *)malloc(sizeof(struct address)); if (!info->next){ printf("out of memory\n"); return; } info->prior=temp; temp=info; info=info->next; }temp->next=NULL;last=temp;start->prior=NULL;fclose(fp);}
