generates email IDs and stores them in a file - first year programming assignment - September 23, 2009

string-func.cpp

//	file: string-func.cpp
//	generates email IDs and stores them in a file
//	author: Kartik Singhal

#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;

int main()
{
	char atDomain[] = {"@nitc.ac.in"};

	char name[30], enrolID[10],
	emailID[strlen(atDomain) + 40];

	char temp1String[40], temp2String[40];

	bool flag=true;

	fstream mailfile("emails.txt", ios::app);
	mailfile.close();

	cout<<"Please enter the following details:\n";
	cout<<"Name: ";
	cin.getline(name, 30);
	cout<<"Enrolment ID: ";
	cin.getline(enrolID, 10);

	//converting enrolID to required format
	enrolID[7]='\0';
	if(isupper(enrolID[0]))
		enrolID[0]+=32;

	strcpy(temp1String, name);

	//converting name to a form suitable for email ID
	for(int i=0; i<strlen(temp1String); i++)
	{
		if(isupper(temp1String[i]))
			temp1String[i]+=32;
		if(temp1String[i]==' ' || temp1String[i]=='.')
			for(int j=i--; j<strlen(temp1String); j++)
				temp1String[j]=temp1String[j+1];
	}

	strcpy(emailID, temp1String);
	strcat(emailID, atDomain);

	cout<<"\nThe generated email ID is: "<<emailID<<endl;
	cout<<"\nPlease wait, checking whether this ID already exists...\n";

	mailfile.open("emails.txt", ios::in);

	while(!mailfile.eof())
	{
		cout<<"check";
		mailfile>>temp2String;
		if(!strcmp(temp2String, emailID))
		{
			cout<<"Done!\nThis ID already exists!"<<endl;
			flag=false;
			break;
		}
	}
	mailfile.close();

	mailfile.open("emails.txt", ios::app|ios::out);
	if(flag)
	{
		cout<<"Done!\nThis ID doesn't exist in the database!"<<endl;
		mailfile.seekp(0, ios::end);
		mailfile<<emailID<<endl;
	}
	else
	{
		cout<<"\nGenerating new ID..."<<endl;
		strcat(temp1String, enrolID);
		strcpy(emailID, temp1String);
		strcat(emailID, atDomain);
		cout<<"The newly generated ID is: "<<emailID<<endl;
		mailfile.seekp(0, ios::end);
		mailfile<<emailID<<endl;
	}
	cout<<"\nemail ID saved."<<endl;
	mailfile.close();

	return 0;
}