# convert double to signed int

8 views (last 30 days)
michael on 3 Mar 2020
Edited: Stephen23 on 11 Jun 2024
Hi,
Some doubt: if A=40000 = 0x9C40 and I'd like that 0x9C40 would be as signed integer - what shall be done?
executing int16, I'm getting
int16(A) = 32767
Any suggestion so that I'll get -25,536‬ ?

Walter Roberson on 11 Jun 2024
Depending on how the input is stated...
value = 0x9C40s16
value = int16 -25536

BhaTTa on 11 Jun 2024
To interpret 0x9C40 as a signed 16-bit integer (which in two's complement would indeed be -25536), you can follow this approach:
1. Direct Interpretation (If the number is already in two's complement): If you have a number that is already in a form of two's complement (like 0x9C40 for a 16-bit system) and you want to interpret it as a signed integer, you can do the following:
hexVal = '9C40';
% Convert hex to a 16-bit signed integer
signedVal = typecast(uint16(hex2dec(hexVal)), 'int16');
% Display the result
disp(signedVal);
This code snippet uses hex2dec to convert the hexadecimal string to a decimal. Since hex2dec returns a number that doesn't have a sign, it's first considered as uint16 (unsigned 16-bit integer). The typecast function is then used to reinterpret this number as int16 without changing its bit representation, allowing it to be interpreted as a signed integer.

Stephen23 on 11 Jun 2024
Edited: Stephen23 on 11 Jun 2024
A = 40000
A = 40000
B = typecast(uint16(A), 'int16')
B = int16 -25536

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