pi2.cpp

计算圆周率可一到小数点后任意位,速度还不错

// pi2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"


/* +++Date last modified: 05-Jul-1997 */

#include <stdio.h>
//#include <iostream.h>
long int a=10000,b,c=2800,d,e,f[2801],g; 
void main() 
{  for(;b-c;)  f[b++]=a/5; 
   for(;d=0,g=c*2;c-=14,printf("%.4d",e+d/a),e=d%a); 
   //for(b=c;d+=f[b]*a,f[b]=d%--g,d/=g--,--b;d*=b);
}