We are going to build a simple Contact Management System with C++, designed to handle basic operations like adding, listing, searching, editing, and deleting contacts. It facilitates efficient management of contact information, allowing for quick retrieval, modification, and deletion by using a file-based system for storage.
Introduction
In this C++ project, we will learn the management of users’ contact lists. Through this program, we can easily store and find contact information. Moreover, the user can easily search the data like names, addresses, phone numbers, etc, whenever required.
Objectives
1. To provide an interface for users to add new contacts. The contact details include name, phone number, address, and email.
2. To allow users to view a list of all the contacts that have been saved into the system.
3. To offer a search functionality that lets users find a specific contact by their name.
4. To enable users to update or edit the details of an existing contact.
5. To provide an option to delete a contact from the system when it is no longer needed.
Requirements
To run this Contact management system with C++ you must have:
1. IDE installed for running and compiling the C++ source code. We recommend Dev C++ or Code Blocks for a better experience.
2. Basic understanding of C programming language.
3. Knowledge of file handling in C.
4. Understanding of data structures in C (structures).
5. Familiarity with standard C library functions such as printf(), scanf(), and gets().
Source Code
#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<process.h>
#include<stdlib.h>
#include<dos.h>
struct CONTACTS
{
long phone;
char N[20],ADD[20],mail_id[30];
} member;
char query[20],N[20];
FILE *fp, *ft;
int i,n,ch,l,found;
int main()
{
main:
system("cls"); //Main menu //
printf("\n\t **** Welcome to Contact Management System ****");
printf("\n\n\n\t\t\tHOME PAGE\n\t\t=====================\n\t\t[1] ADD CONTACTS\n\t\t[2] LIST CONTACTS\n\t\t[3] SEARCH CONTACTS\n\t\t[4] EDIT CONTACTS\n\t\t[5] DELETE CONTACTS\n\t\t[0] EXIT\n\t\t=================\n\t\t");
printf("Enter your choice:");
scanf("%d",&ch);
switch(ch)
{
case 0:
printf("\n\n\t\tEXIT?");
break;
//Add new contacts//
case 1:
system("cls");
fp=fopen("contact.dll","a");
for (;;)
{
fflush(stdin);
printf("\nName (Use identical):");
scanf("%[^\n]",&member.N);
if(stricmp(member.N,"")==0 || stricmp(member.N," ")==0)
break;
fflush(stdin);
printf("Phone:");
scanf("%ld",&member.phone);
fflush(stdin);
printf("address:");
scanf("%[^\n]",&member.ADD);
fflush(stdin);
printf("mail_id address:");
gets(member.mail_id);
printf("\n");
fwrite(&member,sizeof(member),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\tCONTACT NO\t ADDRESS\t\tE-mail Id.\n=================================================================\n\n");
for(i=97; i<=122; i=i+1)
{
fp=fopen("contact.dll","r");
fflush(stdin);
found=0;
while(fread(&member,sizeof(member),1,fp)==1)
{
if(member.N[0]==i || member.N[0]==i-32)
{
printf("\nName\t: %s\nPhone\t: %ld\nAddress\t: %s\nmail_id\t: %s\n",member.N,
member.phone,member.ADD,member.mail_id);
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(&member,sizeof(member),1,fp)==1)
{
for(i=0; i<=l; i++)
N[i]=member.N[i];
N[l]='\0';
if(stricmp(N,query)==0)
{
printf("\n..::Name\t: %s\n..::Phone\t: %ld\n..::Address\t: %s\n..::mail_id\t: %s\n",member.N,member.phone,member.ADD,member.mail_id);
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]",N);
while(fread(&member,sizeof(member),1,fp)==1)
{
if(stricmp(N,member.N)!=0)
fwrite(&member,sizeof(member),1,ft);
}
fflush(stdin);
printf("\n\n..::Editing '%s'\n\n",N);
printf("..::Name(Use identical):");
scanf("%[^\n]",&member.N);
fflush(stdin);
printf("..::Phone:");
scanf("%ld",&member.phone);
fflush(stdin);
printf("..::address:");
scanf("%[^\n]",&member.ADD);
fflush(stdin);
printf("..::mail_id address:");
gets(member.mail_id);
printf("\n");
fwrite(&member,sizeof(member),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..::TO DELETE CONTACT ENTER THE NAME:");
scanf("%[^\n]",&N);
fp=fopen("contact.dll","r");
ft=fopen("temp.dat","w");
while(fread(&member,sizeof(member),1,fp)!=0)
if (stricmp(N,member.N)!=0)
fwrite(&member,sizeof(member),1,ft);
fclose(fp);
fclose(ft);
remove("contact.dll");
rename("temp.dat","contact.dll");
break;
default:
printf("INVALID ENETRY");
break;
}
printf("\n\n\n..::ENTER 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 ENTRY");
break;
}
return 0;
}Explanation of the Code
1. The program starts with the declaration of a structure CONTACTS which represents contact with fields like phone number, name, address, and email.
2. main(): This function serves as the main entry point of the program. It displays a menu to the user and takes user input for performing various operations. A switch case structure is used to facilitate different operations based on user choice.
3. Case 1: Adds new contacts. The contact details are taken as user input and written to the file “contact.dll” using fwrite().
4. Case 2: Lists all saved contacts. The program reads the file “contact.dll” using fread() and displays the details of each contact.
5. Case 3: Searches for a contact by name. It reads the file and checks each contact’s name with the queried name. If a match is found, the contact’s details are displayed.
6. Case 4: Edits an existing contact. It reads the file to find the contact to be edited, writes all other contacts to a temporary file, takes new details for the edited contact, and writes the updated contact to the temporary file. It then deletes the old file and renames the temporary file.
7. Case 5: Deletes a contact. Similar to the edit operation, it writes all contacts except the one to be deleted to a temporary file, then replaces the original file with the temporary one.
Output
Conclusion
We have successfully built a contact management system with C++ which has all the functionalities to make all possible changes in the contact list. The various options provided in the Main menu are implemented using the cases and switch, break, and continue statements.
Cisco Ramon is an American software engineer who has experience in several popular and commercially successful programming languages and development tools. He has been writing content since last 5 years. He is a Senior Manager at Rude Labs Pvt. Ltd.
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