Random number generation

sbugig

Hi every one out there!! I have a big problem here- I want to generate random integers between 0 and 15, 0, 15 included. but there is a condition, i donot want the numbers to repeat, it should be like: (10,15,0,14,13,1,9,6,5,7,3,12,2,4,8,11)its an example! can any one help me please? I tried this but did not work, it repeats some integers System.Random r = new Random();for (int i = 0; i < 15; i++){ System.Console.WriteLine(r.Next(0, 15));}

4 Replies

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Solitaire21y ago

What you want to use is a shuffle sort algorithm. Here is a sample Console Application program code using numbers from 1 to 20:

using System;

namespace ShuffleSort_CS

{

class Class1

{

static void Main(string[] args)

{

int x, mix, temp, N = 20; string entry;

int[] rndarray = new int[N + 1];

Random randnum = new Random();

for (x = 1; x <= N; x++)

rndarray[x] = x;

Console.Write("{0} random numbers w/o duplicates. ", N);

Console.WriteLine("Enter to repeat, any key to stop.\n");

do

{

for (x = 1; x <= N; x++)

{

mix = randnum.Next(1, N + 1);

temp = rndarray[mix];

rndarray[mix] = rndarray[x];

rndarray[x] = temp;

}

for (x = 1; x <= N; x++)

Console.Write("{0} ", rndarray[x]);

Console.WriteLine("\n");

entry = Console.ReadLine();

}

while (entry == "");

}

}

}
mr.stork21y ago
Why dont you use an array? Keep every generated number in an array. And check every new number!
If it has been used, take a new one until Array[14] != 0;
mr.stork21y ago
Hi every one out there!! I have a big problem here- I want to generate random integers between 0 and 15, 0, 15 included. but there is a condition, i donot want the numbers to repeat, it should be like: (10,15,0,14,13,1,9,6,5,7,3,12,2,4,8,11)its an example! can any one help me please? I tried this but did not work, it repeats some integers
System.Random r = new Random();
for (int i = 0; i < 15; i++)
{
System.Console.WriteLine(r.Next(0, 15));
}
Reddy21y ago
zxczx