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CS.102
MUST · Faculty of IT · Spring 2026

Introduction to Computer
Programming in C++

Exams, materials, and practice for CS.102, built around Deitel & Deitel's C++ How to Program. Sign in with your @must.edu.eg address to access your coursework this term.

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Interactive execution engineDeitel ch. 08

Pointer arithmetic and dereferencing

trace.cppC++20
int arr[] = { 10, 20, 30, 40 };
int* ptr = arr;
std::cout << *ptr << std::endl;
ptr += 2;
std::cout << *ptr << std::endl;
*ptr = 99;
std::cout << arr[2] << std::endl;
Step 1 of 7

What just happened

arr is allocated on the stack as four contiguous ints. No heap involved yet — the size is known at compile time.

Variables

Live

arr[0]
10
arr[1]
20
arr[2]
30
arr[3]
40
stdout
nothing printed yet

Rubric Grading

An essay is marked, not scored

The rubric your instructor wrote is applied one criterion at a time, and you get each criterion's reasoning back with it. Not a number out of ten with nothing attached.

Where the marker is not confident, your instructor reviews that criterion before the grade is released.

question
07
chapter
ch.11
points
5
of
1 of 9
CS.102 · Midterm · Spring 2026 · Question 07

This program is correct as written, but it stops being correct the moment the pointed-to object is a derived type. Explain what the delete does here, and what changes if Shape's destructor is not virtual.

class Shape {
public:
    virtual ~Shape() = default;
};

class Circle : public Shape {
public:
    ~Circle() override { radius_ = 0; }
};

Shape* make() { return new Circle; }

int main() {
    Shape* s = make();
    delete s;
}
Marker's margin
dispatch point1/1

Correct: delete s calls through the pointer's static type, which is Shape.

virtual destructor2/2

Names dynamic dispatch and ties it to the virtual keyword on ~Shape.

if omitted1/2

Right mechanism, but stops at “only ~Shape runs”. Does not name the resource Circle held that then leaks.

Total4/5

A graded answer, shown the way the rubric scores it.

Memory model

Where the variables actually live

int* ptr = nullptr;
int count = 42;
01/04Declaration
StackLocal scope · freed on return
ptrint*nullptr0x7ffd01
countint420x7ffd05
HeapAllocated by new

Nothing allocated yet. The stack alone is enough for anything whose size the compiler can work out.

Two locals are created in the current stack frame. ptr is a pointer initialised to null, so it points at nothing and any dereference would be a fault.

Try oneDeitel ch. 08

Given the array below, what does *(arr + 2) evaluate to?

Given the array below, what does *(arr + 2) evaluate to?

int arr[4] = { 10, 20, 30, 40 };

Syllabus

Eight chapters, in the order you will meet them

Materials, practice sets, and exam questions are all tagged to the chapter they come from.

Focus
  1. 01
  2. 02
  3. 03
  4. 04
  5. 05
  6. 06
  7. 07
  8. 08

Platform Modules

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