程序代码：

//打印菱形

import java.util.*;

public class LingXing {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int level = s.nextInt();
        
        print(level);
            
    }    
    
    public static void print(int level) {
        int t = (level + 1) / 2;
        int i, j;
        
        for(i = 1; i<=t; i++) { //打印上半部分
            for(j = 1; j<=t-i; j++) {
                System.out.print(" ");    
            }    
            
            for(j = 1; j<=2*i-1; j++) {
                System.out.print("*");    
            }
            
            System.out.println();
        }    
        
        for(i = 1; i<t; i++) { //打印下半部分
            for(j = 1; j<=i; j++) {
                System.out.print(" ");    
            }    
            
            for(j = (t-i)*2-1; j>=1; j--) {
                System.out.print("*");    
            }
            
            System.out.println();
        }
    }
}