Contact Management System Project Using C Language .

#include<stdio.h>
 
#include<conio.h>
 
#include<string.h>
 
#include<process.h>
 
#include<stdlib.h>
 
#include<dos.h>
 
struct contact
 
{
 
    long ph;
 
    char name[20],add[20],email[30];
 
} list;
 
char query[20],name[20];
 
FILE *fp, *ft;
 
int i,n,ch,l,found;
 
int main()
 
{
 
main:
 
    system("cls");    /* ************Main menu ***********************  */
 
 
    printf("\n\n\n\t\t\tMAIN MENU\n\t\t=====================\n\t\t[1] Add a new Contact\n\t\t[2] List all Contacts\n\t\t[3] Search for contact\n\t\t[4] Edit a Contact\n\t\t[5] Delete a Contact\n\t\t[0] Exit\n\t\t=================\n\t\t");
 
    printf("Enter the choice:");
 
    scanf("%d",&ch);
 
    switch(ch)
 
    {
 
    case 0:
 
        printf("\n\n\t\t Are you sure you want to exit?");
 
        break;
 
        /* *********************Add new contacts************  */
 
    case 1:
 
        system("cls");
 
        fp=fopen("contact.dll","a");
 
        for (;;)
 
        {
            fflush(stdin);
 
            printf("To exit enter blank space in the name input\nName (Use identical):");
 
            scanf("%[^\n]",&list.name);
 
            if(stricmp(list.name,"")==0 || stricmp(list.name," ")==0)
 
                break;
 
            fflush(stdin);
 
            printf("Phone:");
 
            scanf("%ld",&list.ph);
 
            fflush(stdin);
 
            printf("address:");
 
            scanf("%[^\n]",&list.add);
 
            fflush(stdin);
 
            printf("email address:");
 
            gets(list.email);
 
            printf("\n");
 
            fwrite(&list,sizeof(list),1,fp);
 
        }
 
        fclose(fp);
 
        break;
 
        /* *********************list of contacts*************************  */
 
    case 2:
 
        system("cls");
 
        printf("\n\t\t================================\n\t\t\tLIST OF CONTACTS\n\t\t================================\n\nName\t\tPhone No\t    Address\t\tE-mail ad.\n=================================================================\n\n");
 
        for(i=97; i<=122; i=i+1)
 
        {
 
            fp=fopen("contact.dll","r");
 
            fflush(stdin);
 
            found=0;
 
            while(fread(&list,sizeof(list),1,fp)==1)
 
            {
 
                if(list.name[0]==i || list.name[0]==i-32)
 
                {
 
                    printf("\nName\t: %s\nPhone\t: %ld\nAddress\t: %s\nEmail\t: %s\n",list.name,
 
                           list.ph,list.add,list.email);
 
                    found++;
 
                }
 
            }
 
            if(found!=0)
 
            {
                printf("=========================================================== [%c]-(%d)\n\n",i-32,found);
 
                getch();
            }
 
            fclose(fp);
 
        }
 
        break;
 
        /* *******************search contacts**********************  */
 
    case 3:
 
        system("cls");
 
        do
 
        {
 
            found=0;
 
            printf("\n\n\t..::CONTACT SEARCH\n\t===========================\n\t..::Name of contact to search: ");
 
            fflush(stdin);
 
            scanf("%[^\n]",&query);
 
            l=strlen(query);
 
            fp=fopen("contact.dll","r");
 
            system("cls");
 
            printf("\n\n..::Search result for '%s' \n===================================================\n",query);
 
            while(fread(&list,sizeof(list),1,fp)==1)
 
            {
 
                for(i=0; i<=l; i++)
 
                    name[i]=list.name[i];
 
                name[l]='\0';
 
                if(stricmp(name,query)==0)
 
                {
 
                    printf("\n..::Name\t: %s\n..::Phone\t: %ld\n..::Address\t: %s\n..::Email\t: %s\n",list.name,list.ph,list.add,list.email);
 
                    found++;
 
                    if (found%4==0)
 
                    {
 
                        printf("..::Press any key to continue...");
 
                        getch();
 
                    }
 
                }
 
            }
 
            if(found==0)
 
                printf("\n..::No match found!");
 
            else
 
                printf("\n..::%d match(s) found!",found);
 
            fclose(fp);
 
            printf("\n ..::Try again?\n\n\t[1] Yes\t\t[0] No\n\t");
 
            scanf("%d",&ch);
 
        }
        while(ch==1);
 
        break;
 
        /* *********************edit contacts************************/
 
    case 4:
 
        system("cls");
 
        fp=fopen("contact.dll","r");
 
        ft=fopen("temp.dat","w");
 
        fflush(stdin);
 
        printf("..::Edit contact\n===============================\n\n\t..::Enter the name of contact to edit:");
 
        scanf("%[^\n]",name);
 
        while(fread(&list,sizeof(list),1,fp)==1)
 
        {
 
            if(stricmp(name,list.name)!=0)
 
                fwrite(&list,sizeof(list),1,ft);
 
        }
 
        fflush(stdin);
 
        printf("\n\n..::Editing '%s'\n\n",name);
 
        printf("..::Name(Use identical):");
 
        scanf("%[^\n]",&list.name);
 
        fflush(stdin);
 
        printf("..::Phone:");
 
        scanf("%ld",&list.ph);
 
        fflush(stdin);
 
        printf("..::address:");
 
        scanf("%[^\n]",&list.add);
 
        fflush(stdin);
 
        printf("..::email address:");
 
        gets(list.email);
 
        printf("\n");
 
        fwrite(&list,sizeof(list),1,ft);
 
        fclose(fp);
 
        fclose(ft);
 
        remove("contact.dll");
 
        rename("temp.dat","contact.dll");
 
        break;
 
        /* ********************delete contacts**********************/
 
    case 5:
 
        system("cls");
 
        fflush(stdin);
 
        printf("\n\n\t..::DELETE A CONTACT\n\t==========================\n\t..::Enter the name of contact to delete:");
 
        scanf("%[^\n]",&name);
 
        fp=fopen("contact.dll","r");
 
        ft=fopen("temp.dat","w");
 
        while(fread(&list,sizeof(list),1,fp)!=0)
 
            if (stricmp(name,list.name)!=0)
 
                fwrite(&list,sizeof(list),1,ft);
 
        fclose(fp);
 
        fclose(ft);
 
        remove("contact.dll");
 
        rename("temp.dat","contact.dll");
 
        break;
 
    default:
 
        printf("Invalid choice");
 
        break;
 
    }
 
    printf("\n\n\n..::Enter the Choice:\n\n\t[1] Main Menu\t\t[0] Exit\n");
 
    scanf("%d",&ch);
 
    switch (ch)
 
    {
 
    case 1:
 
        goto main;
 
    case 0:
 
        break;
 
    default:
 
        printf("Invalid choice");
 
        break;
 
    }
 
    return 0;
 
}

Explanation In C, here's everything you need to know about the Contact Management System: The primary components of this basic C mini project are file management, data structure, functions, and pointers. The following are the essential elements of a contact management system: Add new contacts, including their name, phone number, address, and email address. List all contacts: displays a list of all the contacts in the file, along with their contact information. Contacts may be found by searching by name and phone number. Edit contacts: Make changes to the information provided when adding contacts, such as name, phone number, address, and email address. Delete contacts: removes contacts from the database. This project is identical to the Phonebook application mini-project that we previously shared. File management and data structures are used in both of these little projects. They're designed as a basic console application for novices to study and create small projects

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