Question

1. For each variable (a-g) describe whether the variable itself is global or local, static or not static, and initialized or uninitialized. (Hints: Global variables are always static. Local variables become static when declared with 'static'. For pointers, consider the pointer itself, not anything the pointer might point to.) 2. For each variable (a-g), describe where it is located when DoFunctionB is running. That is, for each variable, describe whether it is on the stack, in statically allocated RAM, or on the heap. (Note that, to get to DoFunctionB, main and DoFunctionA must also be running, and malloc has already been called. Assume that when main calls DoFunctiona and when DoFunctionA calls DoFunctionB, all non-static local variables in main and DoFunctionA are pushed onto the stack. Assume all calls to malloc are successful.) For the pointers, consider both the pointer itself and consider the memory region that each pointer points to". 3. Assume that an "int" and an "int ** are both 4 bytes (32 bits) in size. When DoFunctionB is running (and its call to malloc has been made), how much space is in use in RAM? Break down the usage by the statically allocated RAM area, the heap, and the stack.

problem 2 and 3

Answer 1

2. Following are the places where the memory will be allocated.

1. a: It is a pointer and thus it is in statically allocated RAM.
2. b: It is a pointer and thus it is in statically allocated RAM.
3. c: It is a global variable, thus it is in statically allocated RAM.
4. d: It is a static variable, thus it is in statically allocated RAM.
5. e: It is the variable which is sent from the functionA thus it will be in the stack.
6. f: it is present on the stack of the main function.
7. g: It is present on the stack of the doFunctionA()

3. Heap: 500 integers: 500*4 = 2000bytes
RAM: it will have the static variable which is defined as an integer: 4bytes
Stack: 8 bytes, one integer and one pointer of 4 bytes each which are sent as the function parameters.

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