Draw a square on the screen:
Input:
Enter the square side length N (3 < = N < = 20) and a certain character C that makes up the square side in one line, with a space between them.
Output:
Outputs the square drawn by the given character C. But notice that the row spacing is larger than the column spacing, so to make the result look more like a square, the number of rows we output is actually 50% of the number of columns (rounded).

import java.util.Scanner;

/**
 * Created with InteIIiJ IDEA.
 * Description:
 * User:
 * Date:2019-07-15
 * Time:11:25
 */
public class TestDemo1 {
    public static void function(int a, String c) {
        int tmp = a / 2;//The number of rows is actually 50% of the number of columns
        //Rounding
        if (a % 2 != 0) {
            tmp = a / 2 + 1;
        }
        //When the input is 4, only two lines are printed, each line is a character c
        if(tmp == 2){
            for (int i = 0; i < a; i++) {
                System.out.print(c);
            }
            System.out.println();
            for (int i = 0; i < a; i++) {
                System.out.print(c);
            }
        }else{
            //First line print a whole line
            for (int i = 0; i < a; i++) {
                System.out.print(c);
            }
            System.out.println();
            //In the middle, the beginning and the end of each line are the characters c, and in the middle are the spaces
            for (int i = 0; i < tmp-2; i++) {
                System.out.print(c);
                for (int j = 0; j < a-2; j++) {
                    System.out.print(" ");
                }
                System.out.print(c);
                System.out.println();
            }
            //Print a whole line on the last line
            for (int i = 0; i < a; i++) {
                System.out.print(c);
            }
        }

    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        String c = scanner.next();
        function(a, c);
    }
}