int main()

{

char ca

Unsigned character ucb

Unsigned short usc

ca = 128；

UCB = 128；

USC = ca+UCB；

printf("%d\n "，USC)；

Usc = ca+(short) ucb

printf("%d\n "，USC)；

Usc = (unsigned character) ca+UCB；;

printf("%d\n "，USC)；

USC = ca+(char)UCB；

printf("%d\n "，USC)；

getchar()；

Return EXIT _ SUCCESS

}

The result is: 0,0,256,65280.

The most difficult question is whether you understand the data type conversion in C language.

There is a term called "integer lifting": there is such a conversion between arithmetic types, such as signed or unsigned char type, short type and Bit-field. Before doing arithmetic, they must do integer promotion before they can participate in the operation. For the conversion between other types, please refer to any C language book.