a couple questions about typecast

Hello,
Am I correct that C automatically typecasts from int to char in the following?

Code:

          int c = 97;
          char b;

          b = c;

or do I have to explicitly do ...

Code:

         int c = 97;
         char b;

         b = (char) c;

thanks

Yes. It will store the lowest sizeof(char) bytes (1 in this case) into b including a sign bit if it is signed. In this case, since b is a signed char, it will also perserve its sign.

thanks

since b is a signed char

It depends on the compiler's settings... It can be unsigned as well.

that C automatically typecasts from int to char

Yes, but some compilers on the high warning levels can show a warning about "possible loss of data"

So I should explicitly assign it like this?

Code:

           b = (char) c;

or like this if I wanted to make sure it was unsigned?

Code:

          b = (unsigned char) c;

thanks

No, no no, Some compilers specify 'char' as 'unsigned char', this is unusual because most data-types are signed by default.

so to ensure C is unsigned,

Code:

unsigned char c;
int b;    /* signed by default */

b = (unsigned char) c;   /* To silence the high level warnings. */

Thanks ... I'm new to typecast