Error undefined variable or method in script

i don't understand why am i getting this error

i am using matlab online.

clear
clc

my_num = randi(30);
x = input('Enter a number : \n');
guess_the_number(x);


function guess_the_number(n)
    if n == my_num
        fprintf('Well you guessed it , %d.\n', a)
    elseif n > 30
        fprintf('Too Large bud, wanna go smaller maybe')
    else
        fprintf('Not correct, but nice try, number was %d', a)
    end
end

Error is this

Enter a number : 
12
Unrecognized function or variable 'my_num'.
Error in guess_the_number>guess (line 10)
    if n == my_num
Error in guess_the_number (line 6)
guess(x); 

Answer 1

[Ameer Hamza]

You need to pass the value of 'a' and 'myNum' to the function

clear
clc
my_num = randi(30);
x = input('Enter a number : \n');
a = 2;
guess_the_number(x, my_num, a);
function guess_the_number(n, my_num, a)
    if n == my_num
        fprintf('Well you guessed it , %d.\n', a)
    elseif n > 30
        fprintf('Too Large bud, wanna go smaller maybe')
    else
        fprintf('Not correct, but nice try, number was %d', a)
    end
end

An alternative is to use nested functions.