- 1 year ago
Demystifying LOWORD macro pseudocode into valid C
The LOWORD
macro in C retrieves the lower-order word (16 bits) of a 32-bit value. Here's how you can demystify the LOWORD
macro into valid C code:
c#include <stdio.h>
unsigned short LOWORD(unsigned long value) {
return (unsigned short)(value & 0xFFFF);
}
int main() {
unsigned long value = 0x12345678;
unsigned short result = LOWORD(value);
printf("LOWORD: 0x%04X\n", result);
return 0;
}
In this code:
The
LOWORD
function is defined, which takes aunsigned long
value as input and returns anunsigned short
(lower 16 bits).Inside the
LOWORD
function, the value is masked with0xFFFF
using the bitwise AND operator (&
) to extract the lower-order word (16 bits) of the value.In the
main
function, an example value0x12345678
is used.The
LOWORD
function is called with the example value, and the result is printed usingprintf
with the%04X
format specifier to display the result in hexadecimal format with leading zeros.
Running this code will output:
makefileLOWORD: 0x5678
The result 0x5678
represents the lower-order word of the original value 0x12345678
.