phonebook using linked list for mayank

phonebook.c

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

struct entry{
    char name[50];
    char nick[50];
    char email[50];
    char address[50];
    char city[50];
    char cont[50];
    char pin[50];
    struct entry *lptr;
    struct entry *rptr;
}*temp,*newe,*l,*r;

typedef struct entry *list;

void newentry();
void display(char n[50]);
void deletentry(char n[50]);
void displayall();
void makempty();
int isempty();
void saventry();
void loadentry();
void deleteall();

void newentry()
{
    char a[50],b[50],f[50],g[50],c[50],d[50],e[50];
    int i,k=0;

    printf("Enter the Datas for the New Entry:\n");
    printf("Name      :");
    scanf("%s",a);
    printf("Nick name :");
    scanf("%s",b);
    printf("E-mail ID :");
    scanf("%s",c);
    printf("Address   :");
    scanf("%s",d);
    printf("City      :");
    scanf("%s",e);
    printf("Contact No:");
    scanf("%s",f);
    printf("Pincode   :");
    scanf("%s",g);

    newe=(struct entry*)malloc(sizeof(struct entry));

    for(i=0;i<50;i++){
        newe->name[i]=' ';
        newe->nick[i]=' ';
        newe->email[i]=' ';
        newe->address[i]=' ';
        newe->city[i]=' ';
        newe->cont[i]=' ';
        newe->pin[i]=' ';
    }
    for(i=0;i<50;i++){
        newe->name[i]=a[i];
        newe->nick[i]=b[i];
        newe->email[i]=c[i];
        newe->address[i]=d[i];
        newe->city[i]=e[i];
        newe->cont[i]=f[i];
        newe->pin[i]=g[i];
    }
    if(isempty()){
        newe->lptr=newe->rptr=NULL;
        l=r=newe;
        printf("Your Entry is Added\n");
    } else {
        temp=l;

        while(temp!=NULL) {
            i=stricmp(newe->name,temp->name);
            if(i<0)
                break;
            else if(i>0)
                temp=temp->rptr;
            else if(i==0){
                printf("Name Already Exists.Entry cannot be Added");
                k=1;
                break;
            }
        }

        if(k!=1) {
            if(temp==l) {
                newe->lptr=NULL;
                newe->rptr=l;
                l->lptr=newe;
                l=newe;
                printf("Your Entry is Added");
            } else if(temp==NULL) {
                newe->rptr=NULL;
                newe->lptr=r;
                r->rptr=newe;
                r=newe;
                printf("Your Entry is Added");
            } else {
                newe->rptr=temp;
                newe->lptr=temp->lptr;
                temp->lptr=newe;
                (newe->lptr)->rptr=newe;
                printf("Your Entry is Added");
            }
        }
    }
}

void displayall() {
    int n=1;
    if(!isempty()) {
        temp=l;
        while(temp!=NULL) {
            printf("[%d]    \nName      :%s\n    Nick Name :%s\n    E-mail ID :%s\n    address : %s\n    City      :%s\n    Contact.No :%s\n    Pin code :%s",n,temp->name,temp->nick,temp->email,temp->address,temp->city,temp->cont,temp->pin);
            temp=temp->rptr;
            n++;
        }
    }
    else
        printf("Address Book is Empty");
}

void deletentry(char n[50]) {
    int i;
    if(isempty())
        printf("Address  Book is Empty");
    else {
        temp=l;
        while(temp!=NULL) {
            i=stricmp(temp->name,n);
            if(i==NULL) {
                if(l==r) {
                    l=r=NULL;
                    printf("Entry deleted");
                    break;
                }
                else if(temp==l) {
                    l=l->rptr;
                    l->lptr=NULL;
                    printf("Entry deleted");
                    break;
                }
                else if(temp==r) {
                    r=r->lptr;
                    r->rptr=NULL;
                    printf("Entry deleted");
                    break;
                }
                else {
                    (temp->lptr)->rptr=temp->rptr;
                    (temp->rptr)->lptr=temp->lptr;
                    printf("Entry deleted");
                    break;
                }
        }
        temp=temp->rptr;

    }
    if(temp==NULL)
        printf("Not Found");
    }
}

int isempty() {
    return l==NULL;
}

void makempty() {
    l=r=NULL;
    printf("Address Book is Emptied");
}

void display(char n[50]) {
    int i,p=1;
    if(isempty())
        printf("Address Book is Empty");
    else {
        temp=l;
        while(temp!=NULL) {
            i=stricmp(temp->name,n);
            if(i==NULL){
                if(p==1)
                    printf("Entry is found in %dst position",p);
                else if(p==2)
                    printf("Entry is found in %dnd position",p);
                else if (p==3)
                    printf("Entry is found in %drd position",p);
                else
                    printf("Entry is found in %dth position",p);
                printf("\nName      :%s\n    Nick Name :%s\n    E-mail ID :%s\n    address : %s\n    City      :%s\n    Contact.No :%s\n    Pin code :%s",temp->name,temp->nick,temp->email,temp->address,temp->city,temp->cont,temp->pin);
                break;
            }
            temp=temp->rptr;
            p++;
        }
        if(temp==NULL)
            printf("Entry Not Found");

    }
}

void main()
{
    int l=1,m;
    char n[50];

    while(l!=8) {
        system("cls");

        printf("********************************************************************************\n#------------------------MINI PROJECT-SIMPLE ADDRESSBOOK----------------------\n#********************************************************************************");
        printf("\nEnter Your Choice");
        printf("\n");
        printf("(1)-New Entry");
        printf("\n");
        printf("(2)-Display an Entry");
        printf("\n");
        printf("(3)-Delete an Entry");
        printf("\n");
        printf("(4)-Display all Entries");
        printf("\n");
        printf("(5)-Empty the book");
        printf("\n");
        printf("(6)-Save Entry");
        printf("\n");
        printf("(7)-Load Entries");
        printf("\n");
        printf("(8)-Delete All Saved Files");
        printf("\n");
        printf("(9)-End");
        printf("\n");
        printf("********************************************************************************");
        printf("\n");
        scanf("%d",&l);
        switch(l) {
            case 1:
                newentry();
                getch();
                break;
            case 2:
                printf("Enter the Name of the Person to Display");
                printf("\n");
                scanf("%s",&n);
                display(n);
                getch();
                break;
            case 3:
                printf("Enter the Name of the Person to Delete");
                printf("\n");
                scanf("%s",&n);
                deletentry(n);
                getch();
                break;
            case 4:
                displayall();
                getch();
                break;
            case 5:
                makempty();
                getch();
                break;
            case 6:
                saventry();
                getch();
                break;
            case 7:
                loadentry();
                getch();
                break;
            case 8:
                deleteall();
                getch();
                break;
            case 9:
                printf("Program Ends Here. Thank You!!!");
                printf("\n");
                getch();
                exit(0);
                break;
            default:
                printf("Enter a Valid Choice from 1-9 only");
                printf("\n");
                getch();
                break;
        }
    }
    getch();
}

void saventry() {
    char n[50];
    int c;

    printf("Enter the Name of the Person: ");
    scanf("%s",n);

    list t;
    if(isempty())
        printf("Address Book is Empty\n");
    else {
        FILE *f;
        f=fopen("entry.c","a");
        int i;t=l;
        while(t!=NULL) {
            i=stricmp(t->name,n);
            if(i==0) {
                fprintf(f,"%s %s %s %s %s %s %s",t->name,t->nick,t->email,t->address,t->city,t->cont,t->pin);
                printf("Your Entry Saved\n");
                printf("Add Another Entry? (1-yes/2-no)");
                scanf("%d",&c);
                if(c==1)
                saventry();
                else if(c==2)
                break;
            }
            t=t->rptr;
        }
        fclose(f);
        if(t==NULL)
        printf("Entry Not Found");
    }

}

void loadentry() {
    int i=1;
    list t;
    FILE *f;
    f=fopen("entry.c","r");
    if(f==NULL) {
        printf("Cannot Open");
        exit(1);
    }
    while(fscanf(f," %s %s %s %s %s %s %s",t->name,t->nick,t->email,t->address,t->city,t->cont,t->pin)!=EOF) {
        printf("[%d]    Name      :%s\n    Nick Name :%s\n    E-mail ID :%s\n    address : %s\n    City      :%s\n    Contact.No :%s\n    Pin code :%s",i,temp->name,temp->nick,temp->email,temp->address,temp->city,temp->cont,temp->pin);
        i++;
    }
    fclose(f);
}

void deleteall() {
    FILE *f;
    f=fopen("entry.c","w");
    fclose(f);
    printf("all saved files were delete");
}