Question

*Please write code in C++*

Write a program to verify the validity of the user entered email address.  

if email is valid : output the stating that given email is valid. ex: "The email [email protected] is valid"

else : output the statement that the email is invalid and list all the violations

ex:  "The email sarahwinchester.com is invalid"
* @ symbol
* Missing Domain name

• The program should keep validating emails until user enter 'q'
• Upload your source code. ex: main.cpp

Answer 1

Code:

#include<iostream>
#include<string>
using namespace std;
int main()
{
   while(true)
   {/*Infinet while loop*/
       string email;
       int at_pos=-1,dot_pos=-1,i;/*declaring variables*/
       cout<<"Enter emailId:";
       getline(cin,email);/*Reading email id*/
       if(email=="q")
       {/*If q e break the loop*/
           break;
       }
       else
       {
           if(email[0]>='0'&& email[0]<='9')
           {/*if email id starting with number*/
               cout<<"The email id "<<email<<" is invalid"<<endl;
               cout<<"* Email Id should not start with a number"<<endl;
           }
           else
           {
               for(i=0;i<email.length();i++)
               {
                   if(email[i]=='@')
                   {/*finding the @ index*/
                       at_pos=i;
                   }
                   if(email[i]=='.')
                   {/*finding the . index*/
                       dot_pos=i;
                   }
               }
               if(at_pos==-1)
               {/*if @ not present*/
                   cout<<"The email id "<<email<<" is invalid"<<endl;
                   cout<<"* @ symbol is missing"<<endl;
                   cout<<"* Missing Domain Name "<<endl;
               }
               else if(dot_pos==-1)
               {/*. not present*/
                   cout<<"The email id "<<email<<" is invalid"<<endl;
                   cout<<"* Missing Domain Name "<<endl;
               }
               else if(dot_pos<at_pos)
               {/*if dot is not present after @ symbol*/
                   cout<<"The email id "<<email<<" is invalid"<<endl;
                   cout<<"* Missing Domain Name "<<endl;
               }
               else
               {/*email id is valid*/
               cout<<"The email id "<<email<<" is valid"<<endl;
               }
              
           }
          
       }
   }
}

Output:

Indentation: