用星号打印菱形

题目：用*打印菱形，*中间以空格隔开

    如n=5时输出如下图形：

                  *               

         *       *       *      

*       *       *       *       *

         *       *       *      

                  *               

要求根据输入的n打印出相应的菱形

代码：

#include<iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    if (n % 2 == 0) cout << "请输入奇数！";
    else {
        int x = n / 2 + 1;
        int a = 1;
        for (int i = 1;i <= n;i++)
        {   
            if (i <=x) {
                int b = x - i;
                for (int j = 1;j <= b;j++)
                {
                    cout << "  ";
                }
                for (int k = 1;k <= a;k++)
                {
                    cout << "*" << " ";
                }
                cout << endl;
                if(i<x)a = a + 2;
            }
            else {
                a = a - 2;
                int b = i-x;
                for (int j = 1;j <= b;j++)
                {
                    cout << "  ";
                }
                for (int k = 1;k <= a;k++)
                {
                    cout << "*" << " ";
                }
                cout << endl;            
            }            
        }
    }
    return 0;
}