5 person die roller

I am trying to build a die roller, for a groupe of people, that says which of 5 people has gotten the 6. Right now the die roller tells how many rolls where made. I want it to tell which of the five persons (who roll out of turn) made the roll. So if the roll number (called i) is greater then 5 (number of players) we need to subtract 5 until it is. And then display which person made the roll and how many total rolls were made.

Code die roller:

i=0; % number of throws
         while 1
             i = i + 1; 
             dieRoll = randi(6); % gives a random number 1-6

               if dieRoll < 6;
                   continue  % continue if it's not a 6

               else
                   break % break if it is
               end
           end

       disp(i) %display number of throws

I have then tried to implicate an other if else statement, but out of luck:

   if i > 5
         while i > 5
            i=i-5;
         end
        else
            i=i
        end

Answer 1

[Geoff Hayes]

Mads - I think that your logic could be simplified to

 i = i + 1;
 if i > 5
    i = 1;
 end

So if the roll is six, then we reset to one to indicate that player one is rolling.

You may also want to consider renaming this variable to indicate what it actually represents (i.e the playerId) and to avoid confusion with the imaginary number (which MATLAB represents using i and j).

Answer 2

[Mads Emil Engmarksgaard]

Works like a charm.

i=0; % number of throws

        while 1
             i = i + 1; 

              if i > 5
              i = 1;
              end

             dieRoll = randi(6); % gives a random number 1-6

             if dieRoll < 6;
                 continue  % continue if it's not a 6

             else
                 break % break if it is
             end
        end

        x= [' Player number ', num2str(i), ' rolled a six '];
       disp(x) %display

Answer 3

[Image Analyst]

So complicated. Why not simply make and check all the rolls at once:

% Define parameters.
numRolls = 100
numPeople = 5;
% Make all the rolls in one call to randi.
rolls = randi(6, numRolls, numPeople)
% Done.  Now report who got a 6 at each roll
for roll = 1 : numRolls
  whoGot6 = find(rolls(roll, :) == 6);
  fprintf('\nIn roll #%d, these users got a 6: ', roll);
  fprintf('%d ', whoGot6);
end

Answer 4

[Jos (10584)]

A trick is to start counting from 0 and use the function REM or MOD to determine the index

numRolls = 1 ;
while (randi(6) ~= 6)
  % loop until a roll was a 6
  numRolls = numRolls + 1  ;
end
WhoRolled6 = rem(numRolls-1, 5) + 1 % subtract 1 to count from 0