CodeWarriro don`t support 16-bit multiply 16-bit

[CASEYKEVIN]

in my application, i  need  operation of 16-bit * 16-bit

volatile  dword  mytempDword;

volatile  word   mytempword1 = 300;

volatile  word   mytempword2= 312;

main()

{

   ...

 mytempDword =  mytempword1 * mytempword2;

}

Codewarriror gives wrong result of  28064, but the correct result is 93600,  i found that 93600 = 65536 + 28064 , obviously, the 16th bit is  ignored by CodeWarrior.  why?   my setting options of CodeWarrior is default. and CodeWarriror version is 5.9

Anybody here know why? thanks

regards

[rocco · Accepted solution]

Hi CaseyKevin,

A word can hold an unsigned number from 0 to 65535, or a signed number from -32768 to +32767.

The number 93600 would require at least 17 bits.

If you cast the words into dwords before you multiply, you should get the correct result.

[CASEYKEVIN]

follow you advices,  i get the correct result

thanks very much