avoidcancellationerror.java

是<java程序设计>的课后作业2-8源码.可以供初学者参考,作了解java基础语法所用.

/**
 * @(#)AvoidCancellationError.java
 *
 *
 * @author 
 * @version 1.00 2009/3/3
 */
//应该从小数开始相加
public class AvoidCancellationError {
        
    /**
     * Creates a new instance of <code>AvoidCancellationError</code>.
     */
    public AvoidCancellationError() {
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        int num=5000;
        double sum=0,sumOf1=0;
       for(;num>0;num--)
        	sumOf1+=1/(double)num;
        
        	double sum1=0,sum2=0,sum3=0;
        for(int i=num;i>=1000;i--)
        	sum1+=1000000/(double)i;
        for(int i=999;i>=10;i--)
        	sum2+=100000/(double)i;
        for(int i=9;i>0;i--)
        	sum3+=10000/(double)i;
        sum=sum1/1000000+sum2/100000+sum3/10000;
        double suma=0.57721566490153286060651209+Math.    	        	
        System.out.println(sum+"\n"+sumOf1);
        
    }
}