how to get random numbers from given array

Posted by Writetopallavi under C# on 12/14/2011 | Points: 10 | Views : 5209 | Status : [Member] | Replies : 5

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Hi all
I want to find random numbers from an given array for that i use following logic but i am not getting expected answer yet
protected void Page_Load(object sender, EventArgs e)
{
int[] numarr = { 14, 22, 44, 33, 55, 82, 91, 16, 17, 15 };
int[] a = new int[10];
int[] b = new int[10];
int no = 0;
int count = numarr .Length;
Random RandomNumber = new Random();
for (int i = 0; i < count; i++)
{
no = RandomNumber.Next(1, count);
if (!b.Contains(no))
{
b[i] = no;
a[no] = numarr [i];
}
}

foreach (int j in a)
{
Response.Write("First Number:" + j + "</br>");
}
}

In this code the problem is RandomNumber.Next gives duplicate numbers
I just wants to change the sequence of numbers in numarr array
Please help...

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Posted by: Hmanjarawala on: 12/14/2011 [Member] Bronze | Points: 25

0	for this your logic should be: protected void Page_Load(object sender, EventArgs e) { int[] numarr = { 14, 22, 44, 33, 55, 82, 91, 16, 17, 15 }; int[] a = new int[10]; int[] b = new int[10]; int no = 0; int count = numarr .Length; Random RandomNumber = new Random(); for (int icnt = 0; icnt < count; i++) { repeat: no = RandomNumber.Next(1, count); if (!b.Contains(no)) { b[icnt] = no; a[no] = numarr[icnt] ; } else goto reteat; } foreach (int j in a) { Response.Write("First Number:" + j + "</br>"); } } Himanshu Manjarawala Sr. Software Engineer@AutomationAnywhere http://fieredotnet.wordpress.com/ Writetopallavi, if this helps please login to Mark As Answer. \| Alert Moderator

for this your logic should be:


protected void Page_Load(object sender, EventArgs e) 

{ 

int[] numarr = { 14, 22, 44, 33, 55, 82, 91, 16, 17, 15 }; 

int[] a = new int[10]; 

int[] b = new int[10]; 

int no = 0; 

int count = numarr .Length; 

Random RandomNumber = new Random(); 

for (int icnt = 0; icnt < count; i++) 

{ 

repeat:

no = RandomNumber.Next(1, count); 

if (!b.Contains(no)) 

{ 

b[icnt] = no; 

a[no] = numarr[icnt] ; 

} 

else

   goto reteat;

} 



foreach (int j in a) 

{ 

Response.Write("First Number:" + j + "</br>"); 

} 

}

Himanshu Manjarawala
Sr. Software Engineer@AutomationAnywhere
http://fieredotnet.wordpress.com/

Writetopallavi, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Writetopallavi on: 12/16/2011 [Member] Starter | Points: 25

0	Hello sir, Thanks for your immediate reply. I executed this code but for loop is continuously looping Actually my issue is i want to change the sequence of numbers in given array. Writetopallavi, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Hmanjarawala on: 12/16/2011 [Member] Bronze | Points: 25

0	Hi, if your issue is just to change the sequence then have this code. it may helps you a lot: for (int icnt = 0; icnt < count; i++) { no = RandomNumber.Next(1, count); numarr[icnt] = numarr[icnt] + numarr[no-1]; numarr[no-1] = numarr[icnt] - numarr[no-1]; numarr[icnt] = numarr[icnt] - numarr[no-1]; } replace thos for loop with your existing loop. and keep this code as it is. Himanshu Manjarawala Sr. Software Engineer@AutomationAnywhere http://fieredotnet.wordpress.com/ Writetopallavi, if this helps please login to Mark As Answer. \| Alert Moderator

Hi,

if your issue is just to change the sequence then have this code.

it may helps you a lot:


for (int icnt = 0; icnt < count; i++) 

{ 

no = RandomNumber.Next(1, count); 

numarr[icnt] = numarr[icnt] + numarr[no-1];

numarr[no-1] = numarr[icnt] - numarr[no-1];

numarr[icnt] = numarr[icnt] - numarr[no-1];

}

replace thos for loop with your existing loop.
and keep this code as it is.

Himanshu Manjarawala
Sr. Software Engineer@AutomationAnywhere
http://fieredotnet.wordpress.com/

Writetopallavi, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Writetopallavi on: 12/16/2011 [Member] Starter | Points: 25

0	Hi my problem get solved , I am so happy.. I used following code int[] numarr = { 14, 22, 44, 33, 55, 82, 91, 16, 17, 15 }; int count = numarr.Length; int[] a = new int[count]; int[] b = new int[count]; int no = 0; Random RandomNumber = new Random(); for (int icnt = 0; icnt < count; icnt++) { repeat: no = RandomNumber.Next(1, count); if (!b.Contains(no)) { b[icnt] = no; a[no] = numarr[icnt]; } else { if (b[count-2] != 0) { a[0] = numarr[icnt]; break; } goto repeat; } } foreach (int j in a) { Response.Write("First Number:" + j+ "</br>"); } } Writetopallavi, if this helps please login to Mark As Answer. \| Alert Moderator

Hi
my problem get solved , I am so happy..
I used following code
int[] numarr = { 14, 22, 44, 33, 55, 82, 91, 16, 17, 15 };
int count = numarr.Length;
int[] a = new int[count];
int[] b = new int[count];
int no = 0;
Random RandomNumber = new Random();

for (int icnt = 0; icnt < count; icnt++)
{
repeat:
no = RandomNumber.Next(1, count);
if (!b.Contains(no))
{
b[icnt] = no;

a[no] = numarr[icnt];

}
else
{
if (b[count-2] != 0)
{
a[0] = numarr[icnt];
break;
}
goto repeat;
}
}
foreach (int j in a)
{

Response.Write("First Number:" + j+ "</br>");

}
}

Writetopallavi, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Hmanjarawala on: 12/16/2011 [Member] Bronze | Points: 25

0	Ok, thats gr8. Himanshu Manjarawala Sr. Software Engineer@AutomationAnywhere http://fieredotnet.wordpress.com/ Writetopallavi, if this helps please login to Mark As Answer. \| Alert Moderator

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