Help how do I declare variable correctly?

[Noct]

Also what's the difference between string and int?

 #include <iostream>

using namespace std;

int main()

{
	int Bounty; 
	string firstName;
	double rate;
	Bounty =  4000000000;
	rate = 0.2 * 0.3;
	firstName = "Monkey";
	int age = 19;
	string middleName, lastName;
	middleName = "D.";
	lastName = "Luffy";

	cout << "His name is" << firstName << " "
		 << middleName << " " << lastName << endl;
	cout << "He has" << Bounty << " " <<  "Belly on his head " << endl;
	cout << "And he is only" << age << "years old." << endl;
}   

[vlad from moscow]

int is a fundamental integer type. std::string is a compound user-defined class.

As for your code then you have to include header <string> if you are using objects of type std:;string.

[z05DSL3A]

Noct,

Start here:
http://www.cplusplus.com/doc/tutorial/variables/