pi.cpp

来自「经常使用的一些源程序.包括一些模板.在VC++6.0下通过.」· C++ 代码 · 共 42 行

#include <iostream>
#include <iomanip>
using namespace std;

/*main information*/
void info()
{
	cout << "pi/ 4 ~= 1 - 1/3 + 1/5 - 1/7 + ......";
	cout << endl << endl;
}

/*source code*/
void test()
{
	//input code here......
	double i, p = -1, t = 0;
	for (i = 1; 1 / i > 10e-8; i+=2)
	{
		p = -p;
		t += p / i;
	}
	cout << "pi = " << setprecision(8) << t * 4;
}

/*information of source code owner*/
void end()
{
	cout << "\n\n\n______________\n";
	cout << "xiao zhiqiang\n";
	cout << "[e-mail]\n";
	cout << "Sep,2006";
	getchar();
}

/*the main code*/
void main()
{
	info();
	test();
	end();
}