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PICKING THE LOTTO NUMBERS WHILE SKIPPING SOME

Language : Matlab 2007a Authors : Autar Kaw Last Revised : November 10, 2008 Abstract: This program chooses randomly m unique numbers to play the lotto. Lotto numbers allowed are positive integers from xlow to xhigh, while numbers asked to be skipped are not chosen

clc
clear all
disp('This program chooses randomly m unique numbers to play')
disp('the lotto.  Lotto numbers allowed are positive integers from')
disp('xlow to xhigh, while numbers asked to be skipped are not chosen')
disp('  ')

This program chooses randomly m unique numbers to play
the lotto.  Lotto numbers allowed are positive integers from
xlow to xhigh, while numbers asked to be skipped are not chosen
  

INPUTS

xlow= lowest integer allowed

xlow=1;
% xhigh = highest integer allowed
xhigh=53;
% number of integers to be picked
m=6;
% numbers to be skipped
lottoskip=[ 2  5  7 12  21];
disp ('INPUTS')
fprintf('Lowest integer allowed=%g',xlow)
fprintf('\nHighest integer allowed=%g',xhigh)
fprintf('\nNumbers to be picked=%g\n\n',m)
disp('Lotto numbers skipped')
lottoskip
disp(' ')
% Using the random number generator rand to get the lotto numbers.
% rand generates numbers between 0 and 1.  So we multiply that by xhigh-xlow+1
% and shift it by xlow and then floor it to get the integer part.

INPUTS
Lowest integer allowed=1
Highest integer allowed=53
Numbers to be picked=6

Lotto numbers skipped

lottoskip =

     2     5     7    12    21

 

SOLUTION

number of lotto numbers to be skipped from being chosen

mskip=length(lottoskip);
i=1;
while (i<=m)
    lottonum(i)=floor(xlow+rand*(xhigh-xlow+1));
    % flag= variable that keeps track of previous numbers
    % being same or different from the number picked
    % also it checks if the numbers asked to skipped are
    % not chosen
    flag=0;
    % checking against previous numbers chosen
    for j=1:1:i-1
        if (lottonum(i)==lottonum(j))
            flag=1;
        end
    end
    % checking against numbers to be skipped
    for j=1:1:mskip
        if (lottonum(i)==lottoskip(j))
            flag=1;
        end
    end
    if flag==0
        i=i+1;
    end
end

OUTPUT

disp(' ')
disp('OUTPUT')
disp('The lotto numbers picked are')
fprintf('%g ',lottonum)
disp ('  ')

 
OUTPUT
The lotto numbers picked are
50 25 23 45 28 11   

Published with MATLAB® 7.3