Page 313 - Computer_Science_F5

Computer Science }; 1. Read the following C++ program
Revision Exercise 4
// Derived class Rectangle
class Rectangle : public Shape {
and answer the question that follow:
public:
FOR ONLINE READING ONLY
// Overriding the draw() method
void draw() override { #include<iostream>
using namespace std;
cout << “Drawing a rectangle” int main()
<< endl; {
} int num, temp, sum;
cout<<”Enter a positive integer: “;
}; cin>>num;
// Function to draw any shape cout<<endl;
void drawShape(Shape* shape) { temp=num;
sum=0;
shape->draw(); do
} {

int main() { sum=sum+num%10;
num=num/10;
// Creating objects of different }
shapes while(num>0)
Circle circle; cout<<”sum is: “<<sum<<endl;

Rectangle rectangle; system(“PAUSE”);
// Polymorphic behavior return 0;
}
drawShape(&circle);
drawShape(&rectangle); (a) What are the functions of the

return 0; line #include<iostream>and
} system(“PAUSE”);
(b) Write an error made from this
program.

2. Why do we need to state data type
Chapter Summary
when declaring variables in a C++
program?
Reflect on what you have learnt from 3. How will you guarantee and ensure

this chapter, summarise and keep it in that a variable’s value can never be
your portfolio. changed after its initialisation?

304
for Advanced Secondary Schools

Computer Science Form 5.indd 304 23/07/2024 12:34