really big numbers

[vbCrLf]

I have a program here that doubles .01 64 times. After a while, the numbers start to come out in scientific notation. Is there a type of variable or something that does not do this? I am new to C++, so please make any replies easy to understand. The bold area of the code is the part that displays in scientific notation. Here is the program:

#include <iostream>
#include <cstdlib>

using namespace std;

int first(void);
int bonus(void);

int main(void)
{
	unsigned int response;

	cout<<"Checkerboards and Bacterial Reproduction Problem Solver\nby Drew Harris";

	do
	{
		cout<<"\n\nSelect an Option:\n"
			<<"1) Answer Questions 1, 2, and 3"<<endl
			<<"2) Answer the bonus question"<<endl
			<<"3) Exit"<<endl;
		cin >>response;
		switch(response)
		{
		case 1:
			cout<<endl<<endl;
			first();
			break;
		case 2:
			cout<<endl<<endl;
			bonus();
			break;
		default:
			cout<<endl<<"That is not a menu choice";
		}
	}while(response != 3);
	cout<<"\nThat's how I solved the checkerboard questions."<<endl;
	system("pause");
	return 0;
}

int first(void)
{
	double totalmoney = .01;
	unsigned int cursquare = 1;

	cout<<"1 | 0.01"<<endl;

	while(totalmoney<=21.00)
	{
		totalmoney = totalmoney * 2;
		cursquare++;
		if(totalmoney>21.00)
		{
			break;
		}
		cout<<cursquare<<" | "<<totalmoney<<endl;
	}
return 0;
}

int bonus(void)
{
	double totalmoney = .01;
	unsigned int cursquare = 1;

	cout<<"1 | 0.01"<<endl;

	while(cursquare<64)
	{
		totalmoney = totalmoney * 2;
		cursquare++;
		cout<<cursquare<<" | "<<totalmoney<<endl;
	}
	return 0;
}

[wey97]

In any function using cout or in main( ), use this code:

cout.precision(20);  // 15 is ok

Anything past the 15th digit is not really that accurate.

See this:
http://support.microsoft.com/default...b;EN-US;q42980

to tell you why.

[vbCrLf]

Thanks. That's exactly what I needed.