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

void review(); 
void add(); 
void search(); 
void del(); 
void save(); 

struct node 
{ 
    long snumber; 
    char name[20]; 
    int num; 
} 
fri[100]; 
int count=0; 

int main() 
{ 
    char line[100]; 
    int menu; 
    system("cls"); 
    while(1)  
    { 
    printf("\n\n\n\n\n\t\t\t\t***MAIN MENU***\n\n"); 
    printf("1\t\tappend\n\n"); 
    printf("2\t\tSearch\n\n"); 
    printf("3\t\tdelete\n\n"); 
    printf("4\t\tread\n\n"); 
    printf("5\t\tsave and exit\t\n\n"); 
    printf("6\t\tquit\n\n"); 

    printf("\n\n\nPlease choose:"); 
    gets(line); 
    if (sscanf(line,"%d",&menu) != 1) 
    { 
       printf("incorrect entry \n"); 
       continue; 
    } 
    if (menu < 1 || menu > 6) 
    { 
       printf("incorrect selection"); 
       continue; 
    } 
        if (menu == 1) add(); 
        else if (menu == 2) search(); 
        else if (menu == 3) del(); 
        else if (menu == 4) review(); 
        else if (menu == 5) save(); 
             if (menu == 6) break; 
    } 
return 0; 
} 

void review() 
{ 
    int i; 
    system("cls"); 
    printf("\n\n\n\n\t\t\tAll Of friend's Information\n\n\n\n"); 
    printf(" name number\n\n"); 
    for(i=1;i<=100;i++) 
        if(fri[i].snumber!=0) 
    printf("%s%ld\n",fri[i].name,fri[i].snumber); 
} 

void add() 
{ 
    char s[20]; 
    long x; 
    system("cls"); 
    printf("\n\n\n\nAdd a friend information\n\n\n"); 
    printf("please input his name:"); 
    scanf("%s",s); 
    if(s) 
    { 
        strcpy(fri[count].name,s); 
        printf("\nplease input his/her telephone numbers:"); 
        scanf("%ld",&x); 
        fri[count].snumber=x; 
        printf("\n\n\tCreate OK\n"); 
    } 
} 
void search() 
{ 
    int i=0; 
    char s[20]; 
    int flag=0; 
    while(1) 
    { 
        system("cls"); 
        printf("\nPlease input name you want to search:"); 
        scanf("%s",s); 
        for(i=1;i<=100;i++) 
        { 
            if(strcmp(fri[i].name,s)==0) 
            { 
                printf("name  and his/her numbers\n\n"); 
                printf("%s%ld",fri[i].name,fri[i].snumber); 
                break; 
            } 
            else 
                printf("Can not look up the name\n"); 
        } 
    } 
} 
void del() 
{ 
    int i,flag=1; 
    char s[20]; 
    while(1) 
    { 
        system("cls"); 
        printf("\n\n\n\t\t\t\tTHE NAME OF DELETION\n\n"); 
        printf("\nplease input the name deletion:"); 
        scanf("%s",s); 
        for(i=1;i<=count&&flag==1;i++) 
        { 
            if(strcmp(fri[i].name,s)==0) 
                printf("name number\n\n"); 
            printf("%10s%ld",fri[i].name,fri[i].snumber); 
            printf("\n\n The information"); 
            flag--; 
            for(i=fri[i].num;i<=100;i++) 
            { 
                fri[i].num=i; 
                strcpy(fri[i].name,fri[i+1].name); 
                fri[i].snumber=fri[i+1].snumber; 
            } 
        } 
        if(flag==1) 
        { 
            printf("\n\nERROR:please select it again\n\n");break; 
        } 
        flag=1; 
        printf("DEL OK\n\n\n");break; 
    } 
} 
void save() 
{ 
    FILE *fp; 
    int i; 
    if((fp=fopen("friends_List","wb"))==NULL) 
    { 
        printf("cannot open file\n"); 
        return; 
    } 
    for(i=0;i<100;i++) 
        if (fwrite(&fri[i],sizeof(struct node),1,fp)!=1) 
            printf("file write error\n"); 
     fclose(fp); 
}