[C++知识库]C++语言：输出数字菱形图案（双重循环）

#include<iostream>
using namespace std;
int main()
{
	int n;
	int i,j,k,x=1;
  	int b=0;
cin>>n;
int l=n;
for (i=1;i<=n-1;i++)
{
    for(k=n-i;k>0;k--)
    {
        cout<<" ";
    }
    for(j=i;j>0;j--)
    {
        cout<<" "<<x;
        x++;
    }
x-=1;
    for(x;j<i-1;j++)
    {    x--;
        cout<<" "<<x;
        
    }
    cout<<endl;
    x=1;
}
x=1;
	for (i=0; i<=l; i++)
	{
		for (k = 1; k <= b; k++)
			cout<<" ";
		for (j = 1; j < n; j++)
        {
            cout<<" "<<x;
            x++;
        }
for(j=n;j>0;j--)
{
    cout<<" "<<x;
    x--;
}
		cout<<endl;
		x=1;
		b++;
		n--;
	}
	return 0;
}