编写程序，求派的近似值

3.1415926

供参考：

#include <stdio.h>
main()
{
    double s=0,t=1;
    int i;
    i = 1;   //[1]
    while(t>=1e-5)//[2]
    {
        s = s + t;
        t = 1.0*t*i/(2*i+1); //[3]
        i = i+1;
    }
    s = 2*s; //[4]
    printf("圆周率为:%f\n",s);//[5]
}