For some reason my code is not working , can you please help me. Thank you for your time| | *

function mathgame = mathgame()
  disp('Welcome to the math game!');
  count = 1;
  correct = 0;
  incorrect = 0;
  rand1 = 1 + 9 * rand(1);
  rand2 = 1 + 9 * rand(1);
  sprintf(%d: %d + %d =",count,rand1,rand2)
  answer = input('');
  if answer == rand1+rand2
      disp('Correct!');
      correct = correct +1;
  else
      disp('Incorrect!');
      incorrect  = incorrect+1;
  end
  again = input('Again','s');
  while strcmp(again,'y')==1
      count = count+1;
      rand1 = 1 + 9 * rand(1);
      rand2 = 1 + 9 * rand(1);
      sprintf(%d: %d + %d =",count,rand1,rand2);
      answer = input('');
      if answer == rand1+rand2
          disp('Correct!');
          correct = correct +1;
      else
          disp('Incorrect!');
          incorrect  = incorrect+1;
      end
  again = input('Again','s');
  end
  sprintf('Correct: %d (%.2f %%), Incorrect %d (%.2f %%)',correct,(100.0*correct/count),incorrect,(100.0*incorrect/count))
end

mathgame();

• | |
• * For some reason my code is not working , can you please help me. Thank you for your time| | *

[Walter Roberson]

What difference do you see between what you expect and what you actually get?

[john hollywood]

my code is not even running Sir , that what i am getting when tried it. " >> mathgame() Error: File: mathgame.m Line: 8 Column: 46 Expression or statement is incorrect--possibly unbalanced (, {, or [."

Answer 1

[Walter Roberson]

You have

sprintf(%d: %d + %d =",count,rand1,rand2)

Strings in MATLAB need to be enclosed in apostrophes. You have missed the leading indicator that a string is following, and you ended the string with double-quote.

[john hollywood]

 Hello my code is not work at all . can you please help me, you help will be much appreciated

[john hollywood]

please

Answer 2

[Patrik Ek]

Walter Roberson is correct in his answer. The syntax for sprintf is incorrect. However, you want to use a random integer, or at least a number with less than or equal to 4 decimals. This since matlab only displays 4 decimals without format long, for not mentioning that the game will be really iritating woth to many decimals. The modification in the program concerning this is that I have used randi instead of rand.

The other problem is sprintf. This functions returns a string as a variable. I have made changes in the code to use fprintf instead, which displays a test string (this function can also save text to file, but I have not done it since you did not ask to store the answers on file). I have also made changes to add newline at the end of each string (\n).

The third issue is that you have used '%d' for format specifier, This is not good! You have not defined your variables rand 1 and rand2 as integers, but as doubles, for creating integers you need something like:

randInt = int64(1+9*rand(1));

but I have used randi instead, since I saw now real need to use integers here. However I changed the format specifier to '%g', which takes a float and displays it without trailing zeros.

Except these issues, which I would consider minor, even though the text is worth reading through, Everything is correct.

Ok here comes the code!

function mathgame()

disp('Welcome to the math game!');
count = 1;
correct = 0;
incorrect = 0;
rand1 = randi([1 10],1);
rand2 = randi([1 10],1);
fprintf('%g: %g + %g = ''\n',count,rand1,rand2)
answer = input('');
if answer == rand1+rand2
    disp('Correct!');
    correct = correct +1;
else
    disp('Incorrect!');
    incorrect  = incorrect+1;
end
again = input('Again ','s');
while strcmp(again,'y')==1
    count = count+1;
    rand1 = randi([1 10],1);
    rand2 = randi([1 10],1);
    fprintf('%g: %g + %g = "\n',count,rand1,rand2);
    answer = input('');
    if answer == rand1+rand2
        disp('Correct!');
        correct = correct +1;
    else
        disp('Incorrect!');
        incorrect  = incorrect+1;
    end
again = input('Again ','s');
end
  fprintf('Correct: %g (%.2f %%), Incorrect %g (%.2f %%)\n',correct,(100.0*correct/count),incorrect,(100.0*incorrect/count))
end