5.3. Micro-Level Operations for Procedure Calls

Try these first

1. 1.

   What does the stack pointer (SP) refer to in a CPU?

   Hint

   Think about what part of the memory structure the SP directs to.

2. 2.

   What is the role of the program counter (PC)?

   Hint

   Consider what happens in a sequence of program instructions.

3. 3.

   What is the main function of the stack pointer?

   • To store the next instruction
   • To point to the top of the stack
   • To execute a procedure

   Hint

   Focus on its role in memory management.

4. 4.

   True or False: The program counter (PC) is saved to the stack when a procedure is called.

   • True
   • False

   Hint

   Think about what you'd need to return to the right point in your code.

5. 5.

   If a main program calls two nested procedures A and B, how does the stack pointer behave throughout the process? Describe each step and what gets stored.

   Hint

   Focus on the flow of calls and returns and how each interaction affects the stack state.

6. 6.

   Explain in detail the role of the program pointer during nested procedure calls.

   Hint

   Visualize the program counter as a pointer that guides the execution flow in your code.