How to use the break in a loop?

Question

Taylor Gates 2018-7-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410830-how-to-use-the-break-in-a-loop

评论： Christopher Wallace 2018-7-19

Im trying to create a code that modifies a game. This game is you have 3 tries to guess a number 0-10. If you fail 10 times it will end the game and display 'dumb'. I have done all of that up to the point where it displays dumb, but it will not end the game it just continues. What do I need to change for it to end?

R=floor ( rand()*10 );
count=0;
while (1)
    for i=1:10
      guess=input('Guess a number between 0 to 10    ');
      if (R>guess)
          disp('Your guess is too small')
      elseif (R<guess)
          disp('Your guess is too large')
      elseif (R==guess)
          disp('You are correct! It is ');guess
          break;
      end
          count=count+1
            if(count==3)
              disp('You Failed The Game, Try Again')
              count=0;
               if i==10
              disp('DUMB')
              break;
               end
            end 
  end
end

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Aquatris 2018-7-18

The break you have breaks the first loop it is in, which is the for loop in your code. I do not think you need the while loop since after 10 tries you want to end the game. Remove the while loop and if statement with the break and it should work as you intended to.

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Answer 1

Christopher Wallace 2018-7-18

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Hi Taylor,

The problem with the 'break' statement is that you have 2 loops executing, a while loop and a for loop.

When the break statement is executed it exits the for loop but starts back up since the while loop is still executing.

You could add a similar 'if' statement outside the for loop but still inside the while statement to break again.

      end % end of for loop
      if i==30
        break
      end
  end % end of while loop

There is another issue in your code since it only allows 10 guesses before restarting and since each game is 3 guesses long it end up restarting after 1 guess in the 4th game.

Best of Luck,

Chris

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Taylor Gates 2018-7-18

在 MATLAB Online 中打开

Okay so can you explain that for this modified version of that code? Same principle, 3 guesses or fail but only allowed to fail 10 times. I have it where it breaks at 3 guesses but can you explain where and what the loop and break would go in this code?

R=floor ( rand()*10 ); count=0;

for i=0:10 while(i==10)

        guess=input('Guess a number between 0 and 10')
        if (R>guess)
            disp('Your Guess Is Too Small')
        elseif (R<guess)
            disp('Your Guess Is Too Large')
        elseif (R==guess)
            disp('You are Correct! It is')
        end
        if (guess>10)
            disp('DUMB')
            break;
        end
        count=count+1
        if count==3;
            disp ('You Failed The Game, Try Again')
            break;
        end
    end
end

Christopher Wallace 2018-7-19

Taylor,

Is there a requirement that you have to use the 'break' command? If you have multiple loops but need to end a function early use 'return'.

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Answer 2

KSSV 2018-7-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410830-how-to-use-the-break-in-a-loop#answer_329222

在 MATLAB Online 中打开

N = 10 ;  % This number to be guessed 
Fail = 0 ;
for i = 1:10
    S = input('Guess the Number:','s') ;
    if N==str2num(S)
        disp('You won') ;
        break
    else
        Fail = Fail+1 ;
    end
    if Fail == 3
        disp('You are dumb')
        break
    end
end