C# - How create an arch shape using for loop-CodePudding

This is the first reverse pyramid

for ( i= 10; i >= 1; --i)
        {
            for (j = 1; j <= i;   j)
            {
                Console.Write(j i);
            }
            Console.WriteLine();
        }

For the second one, I want the pyramid reversed, but this time it needs to be a mirror image of the first one, and I also want it to start at the same line where the first one ended, I want it to look like an arch.

can anyone help me

output i want something like this

CodePudding user response：

This works for me:

var output =
    String.Join(
        Environment.NewLine,
        from i in Enumerable.Range(0, 10).Select(x => 10 - x)
        let ns = Enumerable.Range(1, i).Select(x => x   i)
        select $"{String.Concat(ns).PadRight(20)}{String.Concat(ns.Reverse()).PadLeft(20)}");

Console.WriteLine(output);

I get this output:

1112131415161718192020191817161514131211
101112131415161718    181716151413121110
910111213141516          161514131211109
891011121314                141312111098
789101112                      121110987
678910                            109876
5678                                8765
456                                  654
34                                    43
2                                      2