POJ 题目1001 ,hdu1753 （大数，Java简单题）

爱被打了一巴掌 2022-09-17 11:29 117阅读 0赞

[http://poj.org/problem?id=1001][http_poj.org_problem_id_1001]

题目大意： 求R^n ,  输出 ： 前面的0不输出，后面的零不输出

stripTrailingZeros();//末尾除零

*toPlainString*(); //返回不带指数字段的此 BigDecimal 的字符串表示形式

package com.hdu;
    
    import java.math.BigDecimal;
    import java.util.Scanner;
    
    public class POJ1001 {
    	public static void main(String[] args) {
    		Scanner cin = new Scanner(System.in);
    		while(cin.hasNext()){
    			BigDecimal r = cin.nextBigDecimal();
    			int n = cin.nextInt();
    			BigDecimal ans = r.pow(n).stripTrailingZeros();//除去后面多余的0
    			System.out.println(ans.toPlainString().replaceAll("^0", ""));
    		}
    	}
    }
    
    
    /*
    Sample Input
    
    
    95.123 12
    0.4321 20
    5.1234 15
    6.7592  9
    98.999 10
    1.0100 12
    
    
    Sample Output
    
    
    548815620517731830194541.899025343415715973535967221869852721
    .00000005148554641076956121994511276767154838481760200726351203835429763013462401
    43992025569.928573701266488041146654993318703707511666295476720493953024
    29448126.764121021618164430206909037173276672
    90429072743629540498.107596019456651774561044010001
    1.126825030131969720661201
     
     */

[http://acm.hdu.edu.cn/showproblem.php?pid=1753][http_acm.hdu.edu.cn_showproblem.php_pid_1753]

最后输出要加 toPlainString(); 否则WA

package com.hdu;
    
    import java.math.BigDecimal;
    import java.util.Scanner;
    
    public class hdu1753 {
    
    	public static void main(String[] args) {
    		Scanner cin = new Scanner(System.in);
    		while(cin.hasNext()){
    			BigDecimal a = cin.nextBigDecimal();
    			BigDecimal b = cin.nextBigDecimal();
    			a = a.add(b);
    			System.out.println(a.stripTrailingZeros().toPlainString());
    		}
    			
    	}
    }
    /*
    Sample Input
    1.1 2.9
    1.1111111111 2.3444323343
    1 1.1
     
    
    Sample Output
    4
    3.4555434454
    2.1
    
     * */

[http_poj.org_problem_id_1001]: http://poj.org/problem?id=1001
[http_acm.hdu.edu.cn_showproblem.php_pid_1753]: http://acm.hdu.edu.cn/showproblem.php?pid=1753