Day01

原创已于 2024-08-05 23:25:28 修改 · 443 阅读

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于 2024-03-15 22:01:05 首次发布

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本文介绍Java中使用BigDecimal进行浮点数的精确计算，并演示了如何将字符串转换为字符数组，进行字符串连接及拷贝等基本操作。

JavaAPI

浮点数精确计算

BigDecimal s = new BigDecimal(scan.next());
BigDecimal t = new BigDecimal(scan.next());
s = s.add(t);
t = new BigDecimal(scan.next());
System.out.print(s.add(t));

字符串转字符数组

char[] k = scan.next().toCharArray();

字符串连接

StringBuilder str = new StringBuilder();
System.out.print(str.append(s).append(k).toString());

字符串拷贝

char[] k = Arrays.copyOf(s, s.length);

全代码

package cn.edu.Lab;
import java.util.Scanner;
import static java.lang.System.out;
//import java.math.BigDecimal;
//import java.util.Arrays;

public class Day1 {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		/*BigDecimal s = new BigDecimal(scan.next());
		BigDecimal t = new BigDecimal(scan.next());
		s = s.add(t);
		t = new BigDecimal(scan.next());
		System.out.print(s.add(t));*/
		char[] s = {'H','e','l','l','o',' '};
		char[] k = scan.next().toCharArray();
		StringBuilder str = new StringBuilder();
	    //char[] k = Arrays.copyOf(s, s.length);
		System.out.print(str.append(s).append(k).toString());
        scan.close();
	}
}