Java实验三:控制语句

一、实验目的：

掌握基本控制语句，顺序、循环语句，以及字符串的操作
二、实验内容：
1、对输入的字符串进行反转并显示

package experiment_three;
import java.util.Scanner;
public class three_one {
	public static void main(String[] args) {
	Scanner input = new Scanner(System.in);
	System.out.println("Input string:");
	String s = input.next();
	int length = s.length();
	String reverse="";
	for (int i = 0; i < length; i++) {
	reverse = s.charAt(i)+reverse;
	}
	System.out.println("The turn is:"+reverse);
	input.close();
	}
}

2、输出下面图形

package experiment_three;
import java.util.Scanner;
public class three_two {
	public static void main(String[] args) {
	Scanner input = new Scanner(System.in);
	System.out.println("input a number:");
	int n = input.nextInt();
	for(int i = 1;i <= n;i++) {
		for(int j = n-i-1;j >= 0;j--) {
			System.out.print("  ");
		}
		System.out.print(i);
		for(int j=4*(i-1)-2;j>=0;j--) {
			System.out.print(" ");
		}
		if(i == 1) System.out.println();
		else System.out.println(i);
	}
	for(int i = 1;i<n;i++) {
		for(int j = 1;j<i+1;j++) {
			System.out.print("  ");
		}
		System.out.print(n-i);
		for(int j = 4*(n-i-1)-2;j>=0;j--)
			System.out.print(" ");
		if(i==n-1)
			System.out.println();
		else
			System.out.println(n-i);
	}
	input.close();
	}
}