CODEWITHSUNDEEP
c#for-loopgeometry
Nave Tseva
Nave Tseva

Reputation: 878

Pointer triangle in C#

I have a simple quastion. I have this C# code:

static void Main(string[] args)
{
    int num1, i, j, x, y;
    Console.WriteLine("enter number");
    num1=int.Parse(Console.ReadLine());
    for (i=1; i<=num1; i++){
        for (j=1; j<i+1; j++) {
        Console.Write(i);

        }Console.Write("\n"); 
    }
     for (x=num1; x>=0; x--){
        for (y=0; y<x; y++) {
        Console.Write(x);

        }Console.Write("\n"); 
    }
    Console.ReadLine();
}

enter image description here The middle line is repeat twice

Which print triangle from numbers. The problem is that the middle line is repeated twice. My question is how can I change the loop, so the middle line numbers will repeat twice? Wish for help, thanks!

Upvotes: 1

Views: 2168

Answers (4)

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236188

Console.Write("enter number: ");
int num = Int32.Parse(Console.ReadLine());

Enumerable.Range(1, num)
          .Concat(Enumerable.Range(1, num - 1).Reverse())
          .Select(x => String.Join("", Enumerable.Repeat(x.ToString(),x)))
          .ToList()
          .ForEach(line => Console.WriteLine(line));

Upvotes: 2

D Stanley
D Stanley

Reputation: 152491

Because both for loops include num1 as an inclusive condition:

for (i=1; i<=num1; i++){
    // num1 is the last number in this loop
}
for (x=num1; x>=0; x--){
    // num1 is the first number in this loop
}

Change the first loop to stop BEFORE num1:

for (i=1; i<num1; i++){

Upvotes: 2

esertbas
esertbas

Reputation: 486

    static void Main(string[] args)
{
    int num1, i, j, x, y;
    Console.WriteLine("enter number");
    num1=int.Parse(Console.ReadLine());
    for (i=1; i<num1; i++){
        for (j=1; j<i+1; j++) {
        Console.Write(i);

        }Console.Write("\n"); 
    }
     for (x=num1; x>=0; x--){
        for (y=0; y<x; y++) {
        Console.Write(x);

        }Console.Write("\n"); 
    }
    Console.ReadLine();
}

Upvotes: 1

K Mehta
K Mehta

Reputation: 10533

Uhh change

for (x=num1; x>=0; x--){

to

for (x=num1-1; x>=0; x--){

Upvotes: 3

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