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给FinalLaugh发信吧,他比较熟悉javaIn Reply To:系统总是说我的程序Runtime Error,哪位大哥能帮小弟看看我的程序啊?我加了注释 Posted by:ahy at 2004-11-07 15:20:49 > import java.util.*;
> import java.io.*;
> import java.math.*;
>
> public class Main {
> public static void main(String[] args) throws IOException {
> BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
> String s = stdin.readLine();
> while(s!=null) { //循环读入,当readLine()返回null时停止循环
> StringTokenizer st = new StringTokenizer(s);
> StringBuffer sb_r = new StringBuffer(st.nextToken()); //转换第一个语汇单元,即基数r
> int n = Integer.parseInt(st.nextToken()); //转换第二个语汇单元,即指数n
> System.out.println("n=" + n);//输出读入的指数,本行在提交时删除
> if(sb_r.indexOf(".")!=-1) { //当基数中存在小数点“.”时,去除小数部分的后置零
> //从最末位往前找,找到第一个非零字符,并把该非零字符后面的零全部删去
> for(int i=sb_r.length()-1; i>=0; i--) {
> if(sb_r.charAt(i)!='0') {
> sb_r.delete(i+1,sb_r.length());
> break;
> }
> }
> }
> BigDecimal r = new BigDecimal(sb_r.toString()); //将基数转换为用于计算的类型
> System.out.println("r=" + r);//输出读入的基数,本行在提交时删除
> BigDecimal res = r;
> if(n==0) { //如果指数为零,则直接输出1,并再次读入数据,进行下一次循环
> System.out.println(1);
> s = stdin.readLine();
> continue;
> }
> //将基数r相乘n次,求得幂结果
> for(int i=1; i<n; i++) {
> res = res.multiply(r);
> }
> String[] s_res = res.toString().split("E"); //对科学记数法的结果进行拆分,分为尾数和阶数
> if(s_res.length==1) { //如果没有阶数,则删去前导零,并输出结果,然后再次读入数据并进行下一次循环
> StringBuffer sb_res = new StringBuffer(s_res[0]);
> if(sb_res.charAt(0)=='0') {
> sb_res.delete(0,1);
> s_res[0] = sb_res.toString();
> }
> System.out.println(s_res[0]);
> s = stdin.readLine();
> continue;
> }else { //有阶数,则按照阶数正负进行左右移动小数点
> int max = Integer.parseInt(s_res[1]);
> StringBuffer sb_res = new StringBuffer(s_res[0]);
> if(max<0) { //阶数为负,往左移动,添加适当的零
> if(sb_res.length()>1){ //删去小数点,移动位数相应减1
> sb_res.deleteCharAt(1);
> }
> max = Math.abs(max) - 1;
> for(int i=0; i<max; i++) {
> sb_res.insert(0,'0');
> }
> sb_res.insert(0,'.'); //在最前面添加小数点
> }else { //阶数为正,往右移动,添加适当的零
> for(int i=0; i<max; i++) {
> sb_res.append('0');
> }
> }
> System.out.println(sb_res);
> s = stdin.readLine();
> }
> }
> }
> }
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