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c#loops
User
User

Reputation: 25

Writing Loops with multiplication C#

I am having an issue with trying to write a loop that requires me to multiply. What I am trying to do is write a loop that outputs:

i*3 for i = 10 t i = 4000

I tried using a counter method but it seems I am doing something wrong so i tried to fix it an did this

int i = 10;
        for (i = 10; i < 4000; ) 
        {
        int r = i * 3;
        Console.WriteLine(r);

but the number 30 goes into an infinite loop. Any help is appreciated, I am trying to do this for fun so I am self learning. Thanks again!

Upvotes: 2

Views: 5199

Answers (5)

Sagar Jadhav
Sagar Jadhav

Reputation: 129

Try This.

E.g. Array : { 3, 30, 7, 8 }) Top 3 elements of this array is : 30 , 8 ,7 Output : 30 * 8 * 7 = 1680

Array : { 3, 30, 7, 8, -10, -20 }) Top 3 elements of this array is : 30 , 8 ,7 Output : 30 * 8 * 7 = 1680

static void Main(string[] args)
    {
        Console.WriteLine(MaxProduct(new int[] { 7,8,9,10,11,12,13}, 5));
        Console.ReadKey();
    }

    static int MaxProduct(int[] arr, int no)
    {
        int prev = 0;
        int count = 1;
       // if (no >= 1)
        {
            Array.Sort(arr);
            Array.Reverse(arr);

            for (int i = 0; i < no-1 ; i++)
            {
                if (i == 0)
                {
                    prev = arr[i] * arr[i + 1];
                }
                else
                {
                    prev = prev * arr[count];
                }
                count++;
            }
        }
        return prev;
    }

Upvotes: 0

adel
adel

Reputation: 1

class Program
{
    static void Main(string[] args)
    {
        for (int i = 10; i < 4000; i = i*3 )
        {
            Console.WriteLine(i);
        }
    }
}

Upvotes: 0

Keith Nicholas
Keith Nicholas

Reputation: 44288

You need an i++

 for (i = 10; i < 4000; i++)

currently you have a for loop, but i never changes

if you want your new requirement :-

var r = 10;
while(r < 4000)
{
   r = r * 3;
   Console.Writeline(r);
}

or 

for (var r = 30; r < 4000; r = r * 3)
{
     Console.WriteLine(r);
}

Upvotes: 6

Adam V
Adam V

Reputation: 6356

You're almost there (based on your comments)

int i = 10;
while (i < 4000) 
{
    int r = i * 3;
    Console.WriteLine(r);
    i = r;
}

If it has to be a for loop:

for (int i = 10; i < 4000; ) 
{
    int r = i * 3;
    Console.WriteLine(r);
    i = r;
}

Upvotes: 1

Konstantin
Konstantin

Reputation: 3294

is result of loop sum of you multiplication? you have two problems

  1. you're not incrimenting i for (i = 10; i < 4000; i++)

  2. you're not adding to r, declare it outside of loop, then r += i * 3;

Upvotes: 0

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