I struggle with two problems.

[DCisthebest]

I keep struggling with two lines. It keeps saying like this

the left brace '{' was unmatched at the end of the file (line 8)

IntelliSense: expected 'while' (line 68)

I looked around. They seem fine.

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

int main()
{
	string a, b, c, d, e, g, h;
	int f, answer;
	g = "Username";
	h = "Password";
	do {
		std::cout << "Username:" << endl;
		std::getline(std::cin, h);

		if (h == "Username")
		{
			std::cout << "Password:" << endl;
			std::cin >> g;
		}
		if (g != "Password")
		{
			std::cout << "Invalid Password. Try again." << endl;
		}
		else
		{
			std::cout << "Invalid Username. Try again." << endl;
			exit(0);
		}
		while (g != "Password");
		std::cout << "Hello there!" << endl;
		std::cout << "What is your first name?" << endl;
		std::getline(std::cin, a);
		std::cout << "What is your middle name?" << endl;
		std::getline(std::cin, b);
		std::cout << "What is your last name?" << endl;
		std::getline(std::cin, c);
		std::cout << "Where are you from?" << endl;
		std::getline(std::cin, d);
		std::cout << "Where are you working?" << endl;
		std::getline(std::cin, e);
		std::cout << "How old are you?" << endl;
		std::cin >> f;
		std::cout << "My full name is \b " << a << " \b " << b << " \b " << c << "." << endl;
		std::cout << "I am from \b " << d << "." << endl;
		std::cout << "My work is in \b " << e << "." << endl;
		std::cout << "I am \b " << f << " years old." << endl;
		cin.ignore();
		std::cout << "How old am I?" << endl;
		std::cin >> answer;
		if (answer < 32)
		{
			std::cout << "Wrong! I wish I can go back to that age. :)" << endl;
		}
		else if (answer > 32)
		{
			std::cout << "Wrong! Do I look old to you?!" << endl;
		}
		else
		{
			std::cout << "Whoa! That's unbelievable! You got it!" << endl;
		}
		cin.get();
		system("Pause");

		return 0;
	}

[jlb]

Count your beginning braces { and the ending braces } the numbers should match.

It looks like you're missing and ending brace that matches your while() statement to the do statement.

[DCisthebest]

What do you mean by the numbers should match? I put { in there. There are 15 braces in total.

[jlb]

There are 15 braces in total.

This should be an even number.

How many opening braces?

How many closing braces?

[DCisthebest]

I actually solved that. A problem is that it won't go back to username if username is wrong. It keeps moving on to password instead of going back to username.

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

int main()
{
	string a, b, c, d, e, g, h;
	int f, answer;
	g = "Password";
	h = "Username";
	do {
		std::cout << "Username:" << endl;
		std::getline(std::cin, h);
		if (h != "Username")
		{
			{
				std::cout << "Invalid username. Try again." << endl;
			
		}
		}
		std::cout << "Password:" << endl;
		std::getline(std::cin, g);
		if (g != "Password")
		{
			std::cout << "Invalid password. Try again." << endl;
		}
		else
		{
			std::cout << "Access Granted..." << endl;
			std::cout << "Hello there!" << endl;
			std::cout << "What is your first name?" << endl;
			std::getline(std::cin, a);
			std::cout << "What is your middle name?" << endl;
			std::getline(std::cin, b);
			std::cout << "What is your last name?" << endl;
			std::getline(std::cin, c);
			std::cout << "Where are you from?" << endl;
			std::getline(std::cin, d);
			std::cout << "Where are you working?" << endl;
			std::getline(std::cin, e);
			std::cout << "How old are you?" << endl;
			std::cin >> f;
			std::cout << "My full name is \b " << a << " \b " << b << " \b " << c << "." << endl;
			std::cout << "I am from \b " << d << "." << endl;
			std::cout << "My work is in \b " << e << "." << endl;
			std::cout << "I am \b " << f << " years old." << endl;
			cin.ignore();
			std::cout << "How old am I?" << endl;
			std::cin >> answer;
			if (answer < 32)
			{
				std::cout << "Wrong! I wish I can go back to that age. :)" << endl;
			}
			else if (answer > 32)
			{
				std::cout << "Wrong! Do I look old to you?!" << endl;
			}
			else
			{
				std::cout << "Whoa! That's unbelievable! You got it!" << endl;
			}
			cin.get();
		}
	} 
		while (g != "Password");
			system("Pause");

			return 0;
		}

[jlb]

First you really need to use your indentation style consistently, it'll make reading your program easier and following the program logic possible:

#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main()
{
   string a, b, c, d, e, g, h;
   int f, answer;
   g = "Password";
   h = "Username";

   do
   {
      std::cout << "Username:" << endl;
      std::getline(std::cin, h);

      if (h != "Username")
      {
         {
            std::cout << "Invalid username. Try again." << endl;

         }
      }

      std::cout << "Password:" << endl;
      std::getline(std::cin, g);

      if (g != "Password")
      {
         std::cout << "Invalid password. Try again." << endl;
      }
      else
      {
         std::cout << "Access Granted..." << endl;
         std::cout << "Hello there!" << endl;
         std::cout << "What is your first name?" << endl;
         std::getline(std::cin, a);
         std::cout << "What is your middle name?" << endl;
         std::getline(std::cin, b);
         std::cout << "What is your last name?" << endl;
         std::getline(std::cin, c);
         std::cout << "Where are you from?" << endl;
         std::getline(std::cin, d);
         std::cout << "Where are you working?" << endl;
         std::getline(std::cin, e);
         std::cout << "How old are you?" << endl;
         std::cin >> f;
         std::cout << "My full name is \b " << a << " \b " << b << " \b " << c << "." << endl;
         std::cout << "I am from \b " << d << "." << endl;
         std::cout << "My work is in \b " << e << "." << endl;
         std::cout << "I am \b " << f << " years old." << endl;
         cin.ignore();
         std::cout << "How old am I?" << endl;
         std::cin >> answer;

         if (answer < 32)
         {
            std::cout << "Wrong! I wish I can go back to that age. :)" << endl;
         }
         else if (answer > 32)
         {
            std::cout << "Wrong! Do I look old to you?!" << endl;
         }
         else
         {
            std::cout << "Whoa! That's unbelievable! You got it!" << endl;
         }

         cin.get();
      }
   } while (g != "Password");

   system("Pause");

   return 0;
}

A problem is that it won't go back to username if username is wrong. It keeps moving on to password instead of going back to username.

There are a couple of solutions of this. One would be to use another loop, the other would be to use the continue statement when the username is "wrong".

[Lollipop27]

To solve your problem you can either create a new loop or break it.
You can do:

do while ( h != "Username")
{
std::cout << "Invalid username. Try again." << endl;
std::cout << "Please re-enter your username : "<<endl;
std::getline(std::cin, h);
}

Therefore, unless the Username is correct it will ask again the question

[DCisthebest]

The best way is like this

 do
   {
      Username: //I added this one.
      std::cout << "Username:" << endl;
      std::getline(std::cin, h);

      if (h != "Username")
      {
         {
            std::cout << "Invalid username. Try again." << endl;
            goto Username; //I added this one too. 

         }
      }

But I never thought about the best message you wrote. I tested the line you put before you said so. It caused a problem with putting certain username. For example:

Username: userna

It will say Invalid username. Try again.

Please re-enter your username:
Username: username
It would say Please re-enter your username again unless I add Username: and goto Username;

It solves the problem.

But I was thinking about counting 3 attempts or whatever it is before it uses break; But I am not sure about counting down.

[Lollipop27]

I don't know whether it works but maybe you can try sth like that

int count = 1; 

if (h != "Username")
{
       if (count <= 3 )
       {
               std::cout << "Invalid username. Try again." << endl;
               goto Username;
               count ++;
           
       }
  
      else
      {
              return 0; //or return EXIT_FAILURE; 
      }

}

[DCisthebest]

Thank you! I am going to test this one next. I hope your code is awesome.

[DCisthebest]

I tested the code you put for counting. It doesn't show me counts. I kept putting wrong username over and over.

[S G H]

This thread switched completely from a "Tell me where I missed a closing brace" to a "Worst coding practices" collection.

[Lollipop27]

You have to put the
int count = 1;

Outside the do loop otherwise each time, the command will reinitilize the counter. So each time count =1 and therefore it will ask you for username over and over.

And maybe a do while( count < = 3) is better than " if "

[DCisthebest]

And I put count ++; too. It should show me counts when username is wrong. It doesn't do that at all.