/*
Combine two 32-bit values into one 64-bit value.
- The high 32 bits are shifted left by 32 positions.
- The low 32 bits are OR'ed in.
JavaScript Numbers cannot safely hold 64-bit integers,
so we use BigInt for correct 64-bit behavior.
*/
// ------------------------------------------------------------
// Function that combines two 32-bit integers into a 64-bit integer
// ------------------------------------------------------------
function combineTwo32bit(high, low) {
// Convert to BigInt before shifting to avoid precision loss
const high64 = BigInt(high);
const low64 = BigInt(low);
// Shift high part left by 32 bits and OR with low part
const result = (high64 << 32n) | low64;
return result;
}
// ------------------------------------------------------------
// Function that prints a 64-bit BigInt in hex with leading zeros
// ------------------------------------------------------------
function printHex64(value) {
// Convert to hex string and pad to 16 bytes (64 bits)
const hex = value.toString(16).toUpperCase().padStart(16, "0");
console.log("0x" + hex);
}
// ------------------------------------------------------------
// Main program logic
// ------------------------------------------------------------
function main() {
const high = 0x11223344; // Example high 32 bits
const low = 0x55667788; // Example low 32 bits
const combined = combineTwo32bit(high, low);
console.log("High 32 bits: 0x" + high.toString(16).toUpperCase().padStart(8, "0"));
console.log("Low 32 bits: 0x" + low.toString(16).toUpperCase().padStart(8, "0"));
process.stdout.write("Combined 64-bit value: ");
printHex64(combined);
}
main();
/*
run:
High 32 bits: 0x11223344
Low 32 bits: 0x55667788
Combined 64-bit value: 0x1122334455667788
*/
