小弟刚刚接触，不太懂。请教各位大神，下面两个程序哪种对啊？（这是java程序，不过循环语句和c一样，一个是我同学编的，一个是我编的，我就想问问，while变成do while 时，括号里的条件用不用变？）
1.
public  class B{
     public static void main(String args[]){
            float sum= 1.00f;
            float n=1.00f;
           while (1/((2*n-1)*(2*n+1))>=0.00001)
            { sum=sum+1/((2*n-1)*(2*n+1));
                       n++;         }
          System.out.println("x="+String.format("%.5f", sum));
                                        }

输出的 x=1.49842


2.
public  class C{
     public static void main(String args[]){
            double sum= 1.00d;
            double n=1.00d;
            do{ sum+=1/((2*n-1)*(2*n+1));
             n++;                  }
          while (1/((2*n-1)*(2*n+1))>0.000001);
       System.out.println("x="+String.format("%.5f", sum));
                                            }
}
x= 1.49950