is a char promoted to an integer in C++?

[jimjim]

Hello all,

Is a char promoted to an integer in C++ in order to make lets say an
addition?

STD C: 5.1.2.3/10:
In executing the fragment
char c1, c2;
/* ... */
c1 = c1 + c2;
the ''integer promotions'' require that the abstract machine promote the
value of each variable to int size and then add the two ints and truncate
the sum.

TIA

 

[Zara]

Hello all,

Is a char promoted to an integer in C++ in order to make lets say an
addition?

STD C: 5.1.2.3/10:
In executing the fragment
char c1, c2;
/* ... */
c1 = c1 + c2;
the ''integer promotions'' require that the abstract machine promote the
value of each variable to int size and then add the two ints and truncate
the sum.

TIA

Yes, it is so. Some compilers may warn you of the loss of precision
implied in c1 = c1 + c2;
Using c1+=c2 there is neither such promotion no such warning.

 

[Jack Klein]

Hello all,

Is a char promoted to an integer in C++ in order to make lets say an
addition?

STD C: 5.1.2.3/10:
In executing the fragment
char c1, c2;
/* ... */
c1 = c1 + c2;
the ''integer promotions'' require that the abstract machine promote the
value of each variable to int size and then add the two ints and truncate
the sum.

TIA

Yes, as far as the abstract machine is concerned. The "as-if" rule
allows an implementation to skip the actual up and down conversion if
and only if it can produce the same result.