What is the size of the int data type on a 64-bit machine?

The size of the int data type on a 64-bit machine can vary depending on the programming language and the specific machine architecture. However, in many high-level languages like C and C++, an int is usually 4 bytes (or 32 bits) even on a 64-bit machine. This is not a rule and can vary, so it's always a good idea to use functions like sizeof() in C to determine the size of an int on the specific system the program is running on.