23/12/2018

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
FILE *fw,*fr;
int position=0;
int arr[10]; //array for results of search
int i=0;
char c;
int n;
int count=0;
typedef struct birth //defining birthday date
{
    int day;
    int month;
    int year;
}birth;
birth readbirthday() //function for reading birthday from file (used in readcontact() function)
{
    birth birthday;
    fscanf(fr,",%d",&birthday.day);
    fscanf(fr,"/%d",&birthday.month);
    fscanf(fr,"/%d",&birthday.year);
    return birthday;
}

typedef struct contact //defining contacts and its fields
{
    char firstname[20];
    char lastname[20];
    birth birthday;
    char address[50];
    char email[50];
    int phonenumber;
}contact;
contact contacts[100];
void loadcontacts()
{
    FILE * fr = fopen("book.txt","r");
    fseek(fr,position,0);
    fscanf(fr,"%[^,]",contacts[i].firstname);
    fscanf(fr,",%[^,]",contacts[i].lastname);
    fscanf(fr,",%d",&contacts[i].birthday.day);
    fscanf(fr,"/%d",&contacts[i].birthday.month);
    fscanf(fr,"/%d",&contacts[i].birthday.year);
    fscanf(fr,",%[^,]",contacts[i].address);
    fscanf(fr,",%[^,]",contacts[i].email);
    fscanf(fr,",%d\n",&contacts[i].phonenumber);
    position = ftell(fr);
    fclose(fr);
}
int count_contacts()
{
    int x = 0;  // x is a local counter
    fr = fopen("book.txt","r");
    while(!feof(fr))
    {
        if((c=fgetc(fr))=='\n')
            x++;
    }
    fclose(fr);
    return x;
}
void printcontact(contact contacts)
{
    printf("\nFirst name is: %s\n",contacts.firstname);
    printf("Last name is: %s\n",contacts.lastname);
    printf("Birthday: %d/%d/%d\n",contacts.birthday.day,contacts.birthday.month,contacts.birthday.year);
    printf("Address: %s\n", contacts.address);
    printf("E-mail: %s\n",contacts.email);
    printf("Phone number: 0%d\n",contacts.phonenumber);

}
void add_contact()
{
    printf("Enter the contact's first name\t:");
    scanf("%s",contacts[count].firstname);
    printf("Enter the contact's last name\t:");
    scanf("%s",contacts[count].lastname);
    printf("Enter the birth date\n");
    printf("enter the day:\t");
    scanf("%d",&contacts[count].birthday.day);
    printf("enter the month\t:");
    scanf("%d",&contacts[count].birthday.month);
    printf("enter the year\t:");
    scanf("%d",&contacts[count].birthday.year);
    printf("Enter the address: ");
    scanf(" %199[^\n]",contacts[count].address);
    printf("Enter the E-mail: ");
    scanf("%s",contacts[count].email);
    printf("Enter phone number\t:");
    scanf("%d",&contacts[count].phonenumber);
    count++;
}
void save()
{
    fw = fopen("book.txt","w");
    int x;
    for (x=0;x<count;x++)
    {
    fprintf(fw,"%s,",contacts[x].firstname);
    fprintf(fw,"%s,",contacts[x].lastname);
    fprintf(fw,"%d/",contacts[x].birthday.day);
    fprintf(fw,"%d/",contacts[x].birthday.month);
    fprintf(fw,"%d,",contacts[x].birthday.year);
    fprintf(fw,"%s,",contacts[x].address);
    fprintf(fw,"%s,",contacts[x].email);
    fprintf(fw,"%d\n",contacts[x].phonenumber);
    }

    fclose(fw);
}
int* searchlastname()
{
    int x,j=0;
    char key[30];
    int *p=arr;

    printf("Enter the search key: ");
    scanf("%s",key);
    for(x=0;x<count;x++)
    {
        if(substring(contacts[x].lastname,key)==1)
           {
                *(p+j)=x;
                j++;
                n=j;
           }
    }
    if(j==0)
        {
            printf("Search not found\n");
            printf("Do you want to search again? (Yes or No)");
            char confirm [5];
            scanf("%s", confirm);
            if (confirm=="yes"||confirm=="Yes")
                searchlastname();
            else
            display_menu();
        }
    if(j!=0)
    {   //for(j=0;j<n;j++)
        //printcontact(contacts[arr[j]]);
        return p;
    }
}
int* searchfirstname()
{
    int x,j=0;
    char key[30];
    int *p=arr;

    printf("Enter the search key: ");
    scanf("%s",key);
    for(x=0;x<count;x++)
    {
        if(substring(contacts[x].firstname,key)==1)
           {
                *(p+j)=x;
                j++;
                n=j;
           }
    }
    if(j==0)
        {
            printf("Search not found\n");
            printf("Do you want to search again? (Yes or No)");
            char confirm [5];
            scanf("%s", confirm);
            if (confirm=="yes"||confirm=="Yes")
                searchfirstname();
            else
            display_menu();
        }
    if(j!=0)
    {   //for(j=0;j<n;j++)
        //printcontact(contacts[arr[j]]);
        return p;
    }
}
int* searchphonenumber()
{
    int x,j=0;
    char key[30];
    int *p=arr;

    printf("Enter the search key: ");
    scanf("%s",key);
    for(x=0;x<count;x++)
    {
        if(substring((char)contacts[x].phonenumber,key)==1)
           {
                *(p+j)=x;
                j++;
                n=j;
           }
    }
    if(j==0)
        {
            printf("Search not found\n");
            printf("Do you want to search again? (Yes or No)");
            char confirm [5];
            scanf("%s", confirm);
            if (confirm=="yes"||confirm=="Yes")
                searchphonenumber();
            else
            display_menu();
        }
    if(j!=0)
    {   //for(j=0;j<n;j++)
        //printcontact(contacts[arr[j]]);
        return p;
    }
}
int substring(char name[],char key[])
{
    int x,j,flag;
    if(strlen(key)>strlen(name)){
        flag = 0;
        return flag;
    }
    for(x=0;x<=strlen(name)-strlen(key);x++)
    {

        for(j=0;j<strlen(key);j++)
        {

            flag = 1;
        if(key[j] != name[j+x])
        {
            flag = 0;
            break;
        }

        }
        if (flag ==1)
            break;



    }
    return flag;
}
void search_menu()
{
    printf("Search by: \n1 - First name.\n2 - Last name.\n3 - Phone number.");
    int y;
    scanf("%d",&y);
    switch (y)
    {
        case (1): searchfirstname(); break;
        case (2): searchlastname(); break;
        case (3): searchphonenumber(); break;
        default: printf("Invalid input!");search_menu();break;
    }
}
void quit()
{
    printf("Are you sure you want to exit?: (Yes or No)");
    char confirm [10];
    scanf("%s", &confirm);
    if (confirm=="yes"||confirm=="Yes")
        exit(0);
    else
        {
            display_menu();
            switch_function();
        }
}
void display_menu()
{
    printf("***********\n*Phonebook*\n***********\n\nChoose an option:\n1-Add contact\n2-Delete\n3-Modify\n4-Search\n5-Print\n6-Save\n7-Quit\n");
}
void switch_function()
{
    int x; //action
    printf("Please choose a number: ");
    scanf("%d",&x);
    switch (x)
    {
        case(1): add_contact();break;
        case(2): printf("add");break;
        case(3): printf("add");break;
        case(4): search_menu();break;
        case(5): printf("add");break;
        case(6): save();break;
        case(7): quit();break;
        default: printf("Invalid input!");switch_function();//break;
    }
}
int main ()
{
    count = count_contacts();
    return 0;
}