Solved

Random numbers

Posted on 2004-04-05
10
3,178 Views
Last Modified: 2010-04-16
i wrote a small example  a program to make it clear for you guys

for x := 1 to 5 do
begin
write('wtite a number : ') ;
readln(number)
end
for x := 1 to 5 do
writeln(number)

i want it to random then number by size after, like if i enter
5  , 1 ,  6 ,  7 , 2 the result will be
1 , 2 , 5 , 6 , 7  

any clue ?
0
Comment
Question by:blasta
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
  • +2
10 Comments
 
LVL 101

Expert Comment

by:mlmcc
ID: 10762983
You want to SORT the numbers.  This sounds like a home work assignment, is it?

Can you use arrays? I suspect not from the sample code.

Basic algorithm
Compare A & B
Swap if out of order
Compare B & C
Swap if out of order
...
Repeat until no swaps

mlmcc
0
 
LVL 11

Expert Comment

by:ZhaawZ
ID: 10763727
Something from the examples (with some changes), which came with Borland Pascal:

program sorting;

uses
  wincrt;

var
  numbers : array [1..16384] of integer;
  max : word;
  n : integer;

procedure Sort(var arr : array of integer; l, r: Integer);
var
  i, j, x, y: integer;
begin
  i := l;
  j := r;
  x := arr[(l+r) div 2];
  repeat
    while arr[i] < x do i := i + 1;
    while x < arr[j] do j := j - 1;
    if i <= j then begin
      y := arr[i];
      arr[i] := arr[j];
      arr[j] := y;
      i := i + 1;
      j := j - 1;
    end;
  until i > j;
  if l < j then Sort(arr, l, j);
  if i < r then Sort(arr, i, r);
end;

begin
write('How many numbers? : '); readln(max);
for n := 1 to max do begin
  write('write a number (', n, '): ');
  readln(numbers[n]);
end;
clrscr;
for n := 1 to max do write(numbers[n]:6);
writeln;
sort(numbers, 0, max - 1);
for n := 1 to max do write(numbers[n]:6);
end.
0
 

Author Comment

by:blasta
ID: 10765544
thanks guys but i was looking for a shorter answer , yes i can use array  ... but i'll wait to find if there is a shorter way to do it ...
0
Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

 
LVL 11

Expert Comment

by:ZhaawZ
ID: 10768911
Much slower example than the previous one, but.. It's shorter ;) and easier to understand, I think.

program sorting;

uses
  wincrt;

var
  max : word;
  arr : array [1..16384] of integer;
  tmp : integer;
  n : integer;

begin
write('How many numbers? : '); readln(max);
for n := 1 to max do begin
  write('write a number (', n, '): ');
  readln(arr[n]);
end;
clrscr;
for n := 1 to max do write(arr[n]:6);
writeln;
for n := 1 to max - 1 do begin {start sorting}
  if arr[n] > arr[n+1] then begin
    tmp := arr[n];
    arr[n] := arr[n+1];
    arr[n+1] := tmp;
    if n > 1 then n := n - 2;
  end;
end; {end sorting}
for n := 1 to max do write(arr[n]:6);
end.
0
 
LVL 3

Accepted Solution

by:
Aliev earned 125 total points
ID: 10785267
const
N=5;
var
mas:array[1..N] of integer;
i,j,k:integer;
begin

for i:=1 to N do
read(mas[i]);


for i:=1 to N do begin
     for j:=1 to N do begin
         if mas[i]<mas[j] then begin k:=mas[i]; mas[i]:=mas[j]; mas[j]:=k; end;
     end;      
end;



end.
0
 
LVL 1

Expert Comment

by:xtremecris
ID: 10801238
The shortest&fastest way to sort an array of numbers is not QuickSort, or RadixSort for that matter.

If you have numbers which are smaller than, let's say, 1000 you can sort them like this:
- use an array but not for saving the actuall numbers to memory, instead you save their frequency;
- when you read the number N from the keyboard you update the frequency like this:
    freq[N]:=freq[N]+1;
  or simply:
    inc(freq[N]);
- when you want to print the numbers you simply go throw all the numbers form 0 to 1000 with I in a FOR statement and if freq[I]>0 then you print I once(if freq[I]=i), twice(if freq[I]=2) and so on... Of course that can be done with an other FOR statement.

I do not aprove with the habit of others that solve your homework instead of explaing it to you... I hope the admins will take action in this matter!

Anyway if you have a question regarding what I said simply ask.

Best regards,
Cris.
0
 
LVL 1

Expert Comment

by:xtremecris
ID: 10802380
Okay, I see that you accepted an answer which solved your homework.
I'll give you my program too: it's shorter, and faster if you have a lot of numbers:

const Max=32000;
var
freq:array[1..Max] of integer;
i,j,k:integer;
begin
readln(n);
for i:=1 to N do
 begin
  read(j);
  inc(freq[j]);
 end;

for i:=0 to Max do
     for j:=1 to freq[i] do
       Write(j,' ');  
end;
0
 
LVL 101

Expert Comment

by:mlmcc
ID: 11229488
Netminder:
Why the comment?

Having been an educator and given an assignment very much like this one, I was curious.  I also note he never responded to the question nor did he seem offended by it.

Pascal is a TA fraught with homework questions since Pascal is one of the primary teaching tools.  I realize it is used commercially but its original intent and was as a teaching tool and not for building applications for commercial use.

mlmcc
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

There is a lot to be said for protecting yourself and your accounts with 2 factor authentication.  I found to my own chagrin, that there is a big downside as well.
Microsoft is moving in-place eDiscovery & hold from ECP to EOP console under Content Search in Search and Investigation Options.  In this post, I will be showing you how to export emails to a PST file using the Content Search Options.
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question