我不会的程序设计语言

![img](https://img-mid.csdnimg.cn/

release/

• static/image/mid/ask/891195986636141.png "#left")

第一个int main()
{
int i, j, k, n;
cout << "请输入一个数字" << endl;
cin >> n;
for (i = 1; i <= n; i++)
{
for (j = 1; j <= n - i; j++)
{
cout << " ";
}
for (k = 1; k <= i * 2 - 1; k++)
{
cout << "*";
}
cout << endl;
}
return 0;
}
剩下的你把递增改为递减就行了