#include <stdio.h>
#include <stdint.h>
/*
Combine two uint32_t values into one uint64_t.
The usual pattern:
uint64_t result = ( (uint64_t)high << 32 ) | low;
Explanation:
- The 'high' 32-bit value is cast to uint64_t so it can be shifted safely.
- Shifting left by 32 moves it into the upper half of the 64‑bit integer.
- The 'low' 32-bit value is OR'ed in to fill the lower half.
*/
// Function that combines two 32-bit integers into a 64-bit integer
uint64_t combine_uint32(uint32_t high, uint32_t low) {
// Cast 'high' to uint64_t to avoid overflow before shifting
uint64_t result = ((uint64_t)high << 32) | low;
return result;
}
// Function that prints a uint64_t in hex with leading zeros
void print_hex64(uint64_t value) {
printf("0x%016llX\n", (unsigned long long)value);
}
int main() {
uint32_t high = 0x11223344; // Example high 32 bits
uint32_t low = 0x55667788; // Example low 32 bits
uint64_t combined = combine_uint32(high, low);
printf("High 32 bits: 0x%08X\n", high);
printf("Low 32 bits: 0x%08X\n", low);
printf("Combined 64-bit value: ");
print_hex64(combined);
return 0;
}
/*
run:
High 32 bits: 0x11223344
Low 32 bits: 0x55667788
Combined 64-bit value: 0x1122334455667788
*/
