Casting a char to unsigned char

Question

There are many questions related to this but they answer conversion of char* to unsigned char*. What I want to ask is conversion of char to unsigned char :

If I cast ( C-style or static-cast ) a char to an unsigned char like :

char c = 'A' ; unsigned char uc = ( unsigned char ) c ;

Can the integral value of c change during the cast ? As char is signed or unsigned, is implementation defined, so wherever it is signed , is it possible that the cast would change the integral value of the character ?

My Primary concern is for positive values. If I cast the 'above' way, is there a possibility of the values being changed?

What do you think happens when you cast a char containing a negative value to an unsigned char? — gan_
– gan_, Commented Jun 26, 2019 at 9:01
For positive values it won't change. See stackoverflow.com/questions/1049722/what-is-2s-complement — VLL
– VLL, Commented Jun 26, 2019 at 9:03

Bathsheba · Accepted Answer · 2019-06-26 09:21:15Z

Since C++14, char if signed must be 2's complement.

Therefore the cast from signed char to unsigned char and vice-versa cannot change the underlying bit pattern.

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