Question

I'm just a beginner in programming,how to make this program more simple without using #include<iostream> and #include<redex>

here is the question

Terms to know:

If-else statement,for..while..do while,loops,pointer,address,continue,return,break.

Create a C++ program which contain a function to ask user to enter user ID and password. The passwordmust contain at least 6 alphanumeric characters, 1 of the symbols !.@,#,$,%,^,&,* and 1 capital letter.The maximum allowable password is 20. Save the information. Test the program by entering the User ID and password. The maximum number of trials is 3 and if the user has exceed this number,the program will terminate. Explain your program by using comments and please make program which codeblock can read it

#include <iostream>
#include<string.h>
#include <regex>
using namespace std;

//structure format store username and password
struct Data{
   string username;
   string password;
};

bool checkPassword(string pass){
   if(pass.length()>=6 && pass.length()<=20){
   return true;
   }
   return false;
}

int main() {
  
   //creating array of for 10 users
   Data data[10];
   int userCount=0;
   int choice=-1;
   while(choice!=0){
       cout<<endl;
       cout<<"choice\tdescription"<<endl;
       cout<<"1\tsignup\n";
       cout<<"2\t login\n";
       cout<<"0\t exit\n";
       cout<<"enter your choice: ";
       cin>>choice;
      
       if(choice==1){
           if(userCount<10){
               cout<<"enter username: ";
               cin>>data[userCount].username;
               cout<<"enter password: ";
               cin>>data[userCount].password;
               while(checkPassword(data[userCount].password)!=true){
                   cout<<"password does not matched the given format\n";
                   cout<<"Format is:The password must contain at least 6 alphanumeric characters, 1 of the symbols !,@,#,$,%,^,&,* and 1 capital letter.The maximum allowable password is 20"<<endl;
                   cout<<"enter password again: ";
                   cin>>data[userCount].password;
               }
           }
           else{
               cout<<"user database is full, cannot add new record\n";
           }
       }
       else if(choice==2){
           string user,pass;
           cout<<"enter user name: ";
           cin>>user;
          
           int flag=0;
           int count=3;
           for(int i=0;i<10;i++){
               if(data[i].username==user){
                   flag=1;
                   while(1){
                       count--;
                       cout<<"enter password: ";
                       cin>>pass;
                       if(data[i].password==pass){
                           cout<<"Login successfully\n";
                           flag=2;
                           break;
                       }
                       else{
                           if(count==0){
                               return 0;
                           }
                           cout<<"invalid password, please try again. Attempt left: "<<count<<endl;
                       }
                   }
               }
           }
       }
       else if(choice==0){
           break;
       }
   }
   return 0;
}

Answer 1

#include<iostream> IS needed for cin, cout. It just exposes for input and output. We need this

I have removed <regex>

---------------------------------------------------------------------------------------------------------------------------------------------------

#include <iostream>

using namespace std;

//structure format store username and password

struct Data{

string username;

string password;

};

bool checkPassword(string pass){

if(pass.length()>=6 && pass.length()<=20){

return true;

}

return false;

}

int main() {

//creating array of for 10 users

Data data[10];

int userCount=0;

int choice=-1;

while(choice!=0){

cout<<endl;

cout<<"choice\tdescription"<<endl;

cout<<"1\tsignup\n";

cout<<"2\t login\n";

cout<<"0\t exit\n";

cout<<"enter your choice: ";

cin>>choice;

if(choice==1){

if(userCount<10){

cout<<"enter username: ";

cin>>data[userCount].username;

cout<<"enter password: ";

cin>>data[userCount].password;

while(checkPassword(data[userCount].password)!=true){

cout<<"password does not matched the given format\n";

cout<<"Format is:The password must contain at least 6 alphanumeric characters, 1 of the symbols !,@,#,$,%,^,&,* and 1 capital letter.The maximum allowable password is 20"<<endl;

cout<<"enter password again: ";

cin>>data[userCount].password;

}

}

else{

cout<<"user database is full, cannot add new record\n";

}

}

else if(choice==2){

string user,pass;

cout<<"enter user name: ";

cin>>user;

int flag=0;

int count=3;

for(int i=0;i<10;i++){

if(data[i].username==user){

flag=1;

while(1){

count--;

cout<<"enter password: ";

cin>>pass;

if(data[i].password==pass){

cout<<"Login successfully\n";

flag=2;

break;

}

else{

if(count==0){

return 0;

}

cout<<"invalid password, please try again. Attempt left: "<<count<<endl;

}

}

}

}

}

else if(choice==0){

break;

}

}

return 0;

}

--------------------------------------------------------------------------------------------------------------------------------
See Output


main.cppsaved 2 using namespace std; 4 //structure format store username and password clang version 7.0.0-3-ubuntu0.18.04.1 (tags/RELEASE-Q3Fin #include <iostream» clang++-7 -pthread -o main main.cpp /main choice description 1 signup 2 login 0 exit enter your choice: 1 enter username: Rahul enter password: RAHUL password does not matched the given format Format is:The password must contain at least 6 alphanumeric 5 struct Datat string username; string password; 10 bool checkPassword(string pass)í if(pass.length)>-6 && pass.length)<20)4 return true; 12 13 14 15 16 17 int main) 18 19 20 21 characters, 1 of the symbols !,e,#,$,%,A,&,* and 1 capital letter.The maximum allowable password is 20 enter password again: RAHUL!123 return false; choice description 1 signup 2 login 0 exit enter your choice: 2 enter user name: Rahul enter password: RAHUL!12:3 Login successfully //creating array of for 10 users Data data [10]; int userCount-0; int choice--1; while(choice! 0) 23 24 25 26 27 28 29 cout<<endl; cout<<"choice\tdescription"<<endl; cout<<"1\tsignup\n" cout<<"2\t login\n"; cout<<"0\t exit\n"; cout<<"enter your choice: "; choice description 1 signup 2 ogin 0 exit enter your choice: 0

Thanks, PLEASE COMMENT if there is any concern.