How do i tell the player they already guessed a number?

I'm building a number game and i want to tell the user that they already guessed the number before, this is what i've gotten so far but it only allerts the user to habing repeated a guess for certain numbers, any help appreciated!

comp_guess = randi([0 100]); %computer generates random number between 0 and 100
 
Smallest_no = 0; 
Highest_no = 100;
trys = 0;
   
input_st = sprintf ('Guess a number between %d and %d:   ', Smallest_no,Highest_no);
player_guess = input(input_st);  %making it possible for user to guess number
 
guess1 = player_guess; 
guess2 = 0;
 
while player_guess ~= comp_guess
    
    if player_guess < 0 %lets the player know if their guess is out of the games range
    output = ('Out of range, try again:  ');
    player_guess = input(output);
    end
    
     if player_guess > 100 %lets the player know if their guess is out of the games range
    output = ('Out of range, try again:  ');
    player_guess = input(output);
     end      
      
    if player_guess > comp_guess % lets the player know if their guess is higher or lower than the computers generated number
        disp ('Too high! ')
    else 
        disp ('Too low! ')
    end
     
      guess2 = player_guess;
           
      if guess1 == guess2; %lets the player know they already tried this number
          
         disp (' you already guessed this number, try again ');
      end
     
    new_guess = sprintf ('wrong answer, please guess again:  '); 
    player_guess = input(new_guess); %Lets the player continue guessing
    
    trys = trys+1; %keeps track of how many guesses you make
       
end
 
if player_guess == comp_guess
    disp ('Congratulations! You win!') %displays when player guesses correctly
    disp (' it took you this many trys :')
    disp (trys) % displays how many guesses it took to win
end

Answer 1

[Bob Thompson]

I would suggest keeping an array of the guessed values, and then checking if the number exists in that array.

% Outside the loop
guesses = [];

% Inside the loop

if ismember(player_guess,guesses);
    disp (' you already guessed this number, try again ');
end
guesses = [guesses player_guess];

As a side note, your check for too high or too low is going to return a flag of 'too low' whenever the guess is correct. You have the condition looking for greater than the value for too high, but all other conditions (less than or equal to) will return the too low message. All you have to do is change your 'else' into an 'elseif player_guess < comp_guess'.