Do I have the correct code?
It compiles and runs but I'm new to this and I'm just making sure.

Code:
#include<iostream>
#include<iomanip>
#include<stdlib.h>
using namespace std;

// prototype goes here

    double calcint(double amount, double rate);

    int year;
	double rate;
	double amount;
    double annInt;
int main()
{
	// declare variables
	annInt = amount * rate * 1;
		
	// get user input
	cout << "Enter loan amount: ";
    cin >> amount;
	cout << "Enter loan rate: ";
    cin >> rate;

	// call function for calculation
	annInt = calcint(amount, rate);
	cout << "This is your annual intrest rate: " << annInt << endl;
	
	// display results
	system("pause");
	
	return 0;
}

double calcint(double amount, double rate)
{
	return amount * rate * 1;
}