【C++】数字菱形(三)

下面是源代码: 

#include <iostream>

using namespace std;

int main()
{
    int n;
    cout<<"输入数字n:";
    cin>>n;
    for(int i=1; i<=n; i++)
    {
        for(int a=1; a<=n-i; a++)
        {
            cout<<"  ";//两个空格;
        }
        for(int b=1; b<=i; b++)
        {
            cout<<b<<" ";
        }
        for(int c=i-1; c>=1; c--)
        {
            cout<<c<<" ";
        }
        cout<<endl;
    }
    for(int j=1; j<=n-1; j++)
    {
        for(int a=1; a<=j; a++)
        {
            cout<<"  ";//两个空格;
        }
        for(int b=1; b<=n-j; b++)
        {
            cout<<b<<" ";
        }
        for(int c=n-j-1; c>=1; c--)
        {
            cout<<c<<" ";
        }
        cout<<endl;
    }

    return 0;
}

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