Not Converting ASCII to DECIMAL
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I have converted decimal number to ASCII, however I cannot turn the same ASCII code back to it's decimal.
Here is the code:
%DECIMAL TO ASCII
a = 1;
%dec2bin(a); % decimal to binary conversion
b = double(num2str(a)); % decimal to ASCII conversion
%OP TO ASCII
%ASCII TO DECIMAL
c= str2double(b); %ISSUE
d=str2num(b); %ISSUE
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Respuestas (2)
the cyclist
el 23 de Nov. de 2019
c = b-'0'
2 comentarios
the cyclist
el 24 de Nov. de 2019
I poked around for some specific documentation on this behavior, but didn't find it.
I believe what is happening is that MATLAB converts the character array, so the above is equivalent to
c = b - double('0')
per isakson
el 23 de Nov. de 2019
Editada: per isakson
el 24 de Nov. de 2019
I guess the problem is in the meaning of "Converting ASCII to DECIMAL".
The character '1' is represented by the decimal ascci number 49.
The function double() converts from character to decimal ascci number
>> double('1')
ans =
49
and char() converts from decimal ascci number to character
>> char(49)
ans =
'1'
str2double() and num2str() are something else. Look them up in the documentation.
>> str2double('1')
ans =
1
>>
>> num2str( 1 )
ans =
'1'
>>
2 comentarios
per isakson
el 24 de Nov. de 2019
Editada: per isakson
el 24 de Nov. de 2019
Run and answer with the keystrokes "1" and "Enter"
%%
n1=input('Enter n1: ');
class( n1 )
the output in the Command Window will be
Enter n1: 1
ans =
'double'
Thus, n1 returned by input() is already double. Matlab is smart enough to understand that the user wants a double :(
Run and answer with the keystrokes "1" and "Enter"
n1=input('Enter n1: ', 's' ); % notice the 's'
class( n1 )
the output in the Command Window is now
Enter n1: 1
ans =
'char'
The 's' forces input() to return characters and thus
a=double(n1)
returns decimal ascii numbers
a =
49
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