What is the function of a program counter?

The program counter plays a crucial role in the operation of a computer's central processing unit (CPU). It is responsible for keeping track of the address of the next instruction that is to be executed in a program sequence. As each instruction is fetched and executed, the program counter is updated to point to the subsequent instruction in the queue. This allows for a systematic and organized execution of instructions in the correct order, enabling the CPU to function effectively.

The other options refer to functions that are managed by different components of a computer system. Monitoring CPU temperatures pertains to thermal management and is handled by temperature sensors rather than the program counter. Regulating power supply involves power management systems, which ensure that components receive adequate power without damaging them. Facilitating user input relates to input devices and their interfaces with the CPU, which does not involve tracking instruction execution. Thus, the function of the program counter is vital for maintaining proper instruction flow within the CPU, ensuring the processor operates seamlessly.