ASCII coding to get corresponding character

I wrote this code so far, and I am getting the corresponding characters, except I get them all from 32 through 126, no matter what number I type in. Essentially I want to be able to type in a number between 32:126 and get only that numbers character. I want it to be if the code is less than 32 or more than 126 (aka out of that range) the user gets a "?" as an answer. And then the code answers "Bye!" when the -1 is inputed, since it is used to quit. Could I have some help adjusting this code to do that. Thank you!

character=input ('Enter ASCII code(s) or -1 to quit', 's')
n=32:126; %ASCII codes
for i=1:length(n)
    fprintf('%c=%3d\n',n(i),n(i));
    if input<32
        output=?
        if input>126 
            output=?
            if input=-1
                output='Bye!'
            end
        end
    end
end

Answer 1

[Adam Danz]

You can use a switch/case or if/else as shown below.

input is a scalar, integer value (not to be confused with the input() function).

if input < 32 || input > 126
    output = '?'; 
elseif input == -1
    output = 'Bye!'; 
else
    output = char(input); 
end

[Charlotte Reed]

[Adam Danz]

In my answer, integer is a numeric scalar value (a single, numberic value). For example, input = 99.

If you're using the input function, change that variable name because Matlab will think that you're using the input function.

Do you intend to enter a vector of values or a single numeric value?

[Charlotte Reed]

I intend to enter a single numeric value, and obtain the corresponding character for it from the ASCII code. How would I change the input function?

[Adam Danz]

You won't change the input function. You'll change the variable name "input" from my answer. You can change it to any variable name such as inputNumber.

[Charlotte Reed]

It's still not working, please Im desperate. I will post the code I have. The desired output is, you can type in a number between 32 and 126 and get the character it is on the ASCII. If they put -1, the code says "Bye!", and if its not between 32-126 is says "?"

[Charlotte Reed]

[Adam Danz]

"It's still not working,"

Are you getting an error? An unexpected output?

Screenshots aren't that helpful because I can't copy/paste your code.

Also, why is n = 32:126 in there? And why the loop?

Take a few minutes and read the code. Look what it's doing. Make sense of it before running it. It's only a few lines of code. It seems like you're just copy/pasting without thinking about it.

[Charlotte Reed]

it says "index in position 1 exceeds array bounds (must not exceed 1)." and "error in line 1: character = input ('Enter ASCII code(s) or -1 to quit','s');

[Adam Danz]

My bet is that you have a variable in the workspace named input. Remove it.

clear('input')

[Charlotte Reed]

number=input ('Enter ASCII code(s) or -1 to quit','s');
n=32:126;
for i=1:length(n)
    if inputNumber <32 || inputNumber>126
        output='?';
    elseif inputNumber == -1
        output= 'Bye!';
    else
        output= char (inputNumber);
    end
end

[BobH]

Merging Charlotte's code and Adam's answer to remove the variable which shares a name with function

userinput = input('Enter ASCII code or -1 to quit  ');
if userinput < 32 || userinput > 126
    output = '?'; 
elseif userinput == -1
    output = 'Bye!'; 
else
    output = char(userinput); 
end

[Charlotte Reed]

I

I copied it exact and the reponses in the command window were:

>> Index exceeds the number of array elements (95).

Error in (line 1)

userinput = input ('Enter ASCII code(s) or -1 to quit');

[Adam Danz]

@Charlotte Reed, note BobH's syntax with the input() function.

[Charlotte Reed]

Sorry, what do you mean by that?

[Walter Roberson]

clear input

You have a left-over variable named input

[Adam Danz]

@Charlotte Reed,

See my comment here that suggests to clear the input variable in addition to Walter's comment above.

Please take time to read and think about the code.