numberpercentform.java

一些Java的小的应用程序

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
public class Numberpercentform {
public static void main(String args[]){
	try{BufferedReader input=new BufferedReader
		(new InputStreamReader(System.in));
	System.out.println("How many numbers do you want to enter?");
	int n=Integer.parseInt(input.readLine());
	int[]a=new int [n];double[]b=new double [n];
	int sum=0;
	String []s=new String [n];
	System.out.println("Enter "+n+" integers ,one perline");
	for(int i=0;i<a.length;i++){
		a[i]=Integer.parseInt(input.readLine());
		sum+=a[i];
	}
	for(int j=0;j<b.length;j++)
	{b[j]=(double)a[j]/sum;
	//System.out.println(b[j]);
	}
	DecimalFormat form=new DecimalFormat("0.0000%");
	for(int k=0;k<s.length;k++)s[k]=form.format(b[k]);
	System.out.println("The sum is "+sum);
	System.out.println("The numbers are ");
	for(int i=0;i<n;i++)
	System.out.println(a[i]+"\t"+s[i]+"   of the sum.");
	}catch(Exception e){
		System.out.println("ERROR!");
	}}
}