Question

java程序，计算级数1/2+2/3+3/4+...+99/100

import java.math.BigInteger;
import java.math.BigDecimal;

public class Rational extends Number implements Comparable{

private BigInteger numerator;
private BigInteger denominator;

public Rational()
{
this(new BigInteger("0"),new BigInteger("1"));
}

public Rational(BigInteger numerator,BigInteger denominator)
{
BigInteger gcd=gcd(numerator,denominator);
this.numerator=((denominator.compareTo(new BigInteger("0"))>0)?new BigInteger("1"):new BigInteger("-1")).multiply(numerator).divide(gcd);
this.denominator=denominator.abs().divide(gcd);
}

private static BigInteger gcd(BigInteger x1,BigInteger y1)
{
if(x1.compareTo(new BigInteger("0"))==0||y1.compareTo(new BigInteger("0"))==0)
return new BigInteger("1");
BigInteger x=x1.abs();
BigInteger y=y1.abs();
BigInteger m,n,t;
if(x.compareTo(y)>0)
{
m=x;
n=y;
}
else
{
n=x;
m=y;
}
while(m.mod(n).compareTo(new BigInteger("0"))!=0)
{
t=n;
n=m.mod(n);
m=t;
}
return n;
}
部分Rational类
怎么写测试程序，就是Rational类写好，然后根据那个级数写测试程序

Answer 1

public static double getResult(int n)
{
return (double)n/(n+1);
}

public static void main(String[] args) throws IOException
{
double sum = 0.0d;
for(int i = 1; i < 99; i ++)
{
sum += getResult(i);
}
System.out.println("所求值： " + sum);
}

Answer 2

这样吧，你把要计算的整型数int转化成double型的如1/2转成1/2.0如此结果就是0.5了，这样计算就OK了！

Answer 3

你在搞什么飞机 贴个程序 啥都不说

Answer 4

要这么复杂？浮点数不就好了吗？

Answer 5

你目的是什么？程序有问题还是咋滴？