【Java】Java划水练习

Scanner sc=new Scanner(new BufferedInputStream(System.in)); 声明读入器

nextInt 读入整数

System.out.println 带换行输出

import java.util.*;

import java.io.*;

public class Main{

	public static void main(String[] argc){

		Scanner sc = new Scanner (new BufferedInputStream(System.in));

		int a=sc.nextInt(),b=sc.nextInt();

		System.out.println(a+b);

		sc.close();

    }

}

poj1503 Integer Inquiry

BigInteger.ZERO 大整数常量零

equals 相等

add 加

import java.util.*;

import java.io.*;

import java.math.*;

public class Main{

	public static void main(String[] argc){

		Scanner sc = new Scanner (new BufferedInputStream(System.in));

		BigInteger sum=BigInteger.ZERO;

		while(true){

			BigInteger x=sc.nextBigInteger();

			if(x.equals(BigInteger.ZERO)){

				break;

			}

			sum=sum.add(x);

		}

		System.out.println(sum);

		sc.close();

    }

}

poj1001 求高精度幂

stripTrailingZeros 清除不影响大小的零

toPlainString 以朴素的方式（而非科学计数法或工程计数法）将BigDecimal转换成String

hasNext 判断是否读入完成

next 读入字符串，直到空格为止

nextLine 读入一整行字符串

public String substring(int beginIndex) 返回该字符串从beginIndex开始到结尾的子字符串；

public String substring(int beginIndex,int endIndex) 返回该字符串从beginIndex开始到endsIndex结尾的子字符串

import java.util.*;

import java.io.*;

import java.math.*;

public class Main {

	public static void main(String[] argc){

		Scanner sc=new Scanner(new BufferedInputStream(System.in));

		while(sc.hasNext()){

			String s=sc.next();

			int n=sc.nextInt();

			BigDecimal x=new BigDecimal(s);

			s=x.pow(n).stripTrailingZeros().toPlainString();

			if(s.charAt(0)=='0'){

				s=s.substring(1);

			}

			System.out.println(s);

		}

		sc.close();

	}

}

bzoj1876 [SDOI2009]SuperGCD

gcd 求两个大整数的gcd

import java.util.*;

import java.io.*;

import java.math.*;

public class Main {

	public static void main(String[] argc){

		Scanner sc=new Scanner(new BufferedInputStream(System.in));

		BigInteger a=sc.nextBigInteger();

		BigInteger b=sc.nextBigInteger();

		System.out.println(a.gcd(b));

		sc.close();

	}

}

巴特西

【Java】Java划水练习

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