Why C++ is widely used - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why is C++ preferred for system-level programming?

Which of the following reasons best explains why C++ is widely used for system-level programming?

A Because C++ does not support object-oriented programming.

B Because C++ automatically manages memory without programmer intervention.

C Because C++ is an interpreted language that runs slower but is easier to write.

D Because C++ provides low-level memory manipulation and high performance.

💡 Hint

Think about what system-level programming needs in terms of speed and control.

C++ is widely used for system-level programming because it allows direct memory manipulation and produces fast, efficient code.

❓ Predict Output

intermediate

Output of C++ code using classes and pointers

What is the output of the following C++ code?

C++

#include <iostream>
using namespace std;

class Box {
public:
    int length;
    Box(int l) : length(l) {}
    int getLength() { return length; }
};

int main() {
    Box* b = new Box(10);
    cout << b->getLength() << endl;
    delete b;
    return 0;
}

A Runtime error

B 10

C 0

D Compilation error

💡 Hint

Look at how the object is created and accessed through a pointer.

The code creates a Box object with length 10 and prints it using pointer syntax, so output is 10.

❓ Predict Output

advanced

Output of C++ code with virtual functions and inheritance

What is the output of this C++ program?

C++

#include <iostream>
using namespace std;

class Base {
public:
    virtual void show() { cout << "Base" << endl; }
};

class Derived : public Base {
public:
    void show() override { cout << "Derived" << endl; }
};

int main() {
    Base* b = new Derived();
    b->show();
    delete b;
    return 0;
}

A Derived

B Base

C Compilation error

D Runtime error

💡 Hint

Think about how virtual functions work with pointers to base class.

Because show() is virtual, the Derived class version is called even when accessed via Base pointer.

🧠 Conceptual

advanced

Why does C++ support both procedural and object-oriented programming?

Why is C++ designed to support both procedural and object-oriented programming styles?

A To make the language slower but easier to learn.

B Because C++ does not support object-oriented programming fully.

C To allow programmers to choose the best approach for their problem.

D Because procedural programming is deprecated.

💡 Hint

Think about flexibility and programmer choice.

C++ supports multiple programming styles so developers can pick what fits their needs best.

🧠 Conceptual

expert

Why is C++ still widely used despite newer languages?

Which reason best explains why C++ remains widely used even though many newer programming languages exist?

A Because C++ offers unmatched control over hardware and performance.

B Because C++ programs do not require compilation.

C Because C++ automatically handles all memory management.

D Because C++ is easier to learn than newer languages.

💡 Hint

Consider what makes C++ unique compared to newer languages.

C++ gives programmers fine control over system resources and performance, which newer languages often abstract away.