Simple money question

right now, I am working on a problem that requires us to compare 2 different account types at a fictional bank. We have to input a value, and make calculations to show the interest rates and how much you gain/lose at the end of the year by using that type of account, etc.

Right now, I don't have very much of this problem done. There is one simple problem that I need to address. How can I make C++ show the correct number of decimals? For instance...if I enter "250" as a value, it prints "250". I want it to show all values, even if they are zero, as in "250.00".

Code:

#include <iostream>

using namespace std;

int main()

{
	/*variables: avg daily balance; yearly account cost,
	income year (avg.daily * interest%) profit/loss (cost/year - income)*/
	float avg;
	int prft;
	int nvcost = 0;
	int svcost = 12;
	double nvincomeyr = 0;
	double nvinterest = 0;
	double svinterest = 0;
	nvinterest = 0.01;
	svinterest = 0.015;
	prft = nvcost - nvincomeyr;
	std::cout << "Enter Average Daily Balance \n";
	std::cin >> avg;
	nvincomeyr = avg * nvinterest;
	std::cout << "account \t avg daily \t cost/year \t income/year \t profit/loss\n type\t\t  balance\n";
	std::cout << "Netvalue \t    " << avg << "        \t     " << nvcost << "        \t      " << nvincomeyr << "        \t " << prft << "\n"; 
	return (0);
}

(Ignore all of my stupid and confusing comments, and my ill-chosen variable names. )

Also, is there a better way to make a "table" in code? If you see what I've done, I have a delicate balnce of \t's and spaces betweem my categories. Is there a better way to categorize data? In other words, i want it to look something like...

Code:

account type    |  avg daily balance  | cost/year  | income/year | profit/loss
--------------------------------------------------------------------------------
NetValue               250.00               0.00         2.50         2.50
SuperValue             250.00             108.00         3.75      (104.25)

^This.


Thank you very much in advance.

>How can I make C++ show the correct number of decimals?
Use setprecision().

Code:

#include <iomanip>
.
.
std::cout << "Netvalue \t    " << fixed << setprecision(2) << avg << "        \t     " << nvcost << "        \t      " << nvincomeyr << "        \t " << prft << "\n";

>Also, is there a better way to make a "table" in code?
You can use setw() to line up your fields.