How do you get a function to return true or false to the script where the function was called?

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Callum 2023-4-26

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评论： Callum 2023-4-26

I have 2 scripts for a simple game of blackjack. The first script called 'blackjack.m' gives the user initial options like learn the rules and place wages, while the second script 'play_blackjack' deals the players and dealers hands and uses several if loops to determine who wins. On each of these if loops Ive added a game=true/false depending on who the winner is. Back in the first script, when I write 'if game==true' or 'game==false', it doesnt recognise that I have determined these variables in the play_blackjack function and gives the error message. Ive tried initialising the variable 'game' and that didnt do anything. Ive also tried using 1 and 0 instead of true/false and still no changes. Note in the first script I have written simple disp commands 'WIN' and 'LOSE'. These are just temporary so I can finally see if its working or not. Ive been trying to figure this out for a while.

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Answer 1

chicken vector 2023-4-26

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编辑：chicken vector 2023-4-26

在 MATLAB Online 中打开

the file play_blackjack.m is not a script, but a function.

In blackjack.m change the line:

play_blackjack

To:

game = play_blackjack;

Side tip.

Instead of doing

if game == true
    fprintf("WIN")
end
if game == false
    fprintf("LOSE")
end

Do:

if game
    fprintf("WIN")
else
    fprintf("LOSE")
end

Or:

if game
    fprintf("WIN")
end
if ~game
    fprintf("LOSE")
end

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Steven Lord 2023-4-26

在 MATLAB Online 中打开

I'd also consider giving that variable a more descriptive name. The name "game" doesn't scream to me that it's a logical variable indicating whether or not the player won. Perhaps use a name like "playerWon", in which case the code is fairly self-explanatory even for people who may not be familiar with MATLAB code.

if playerWon
    fprintf("YOU WIN")
else
    fprintf("YOU LOSE")
end

If I showed that to my mother (who is most definitely not a programmer) and told her "fprintf prints a message to the screen" she likely could understand and explain that code segment.

Callum 2023-4-26

Thank you so much! Literally saved me from an F! Thanks for your advice on the variable name and the side tip. Ive still got a bunch of formatting to do but thats a good start.

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