Class 12 Computer Science Important Questions (ASSEB / AHSEC)
Chapter 2 - Polymorphism and Function Overloading
1. What is Polymorphism?
Answer : In C++, polymorphism is a feature that allows the same function name or same operator to behave differently in different situations.
2. What are the types of Polymorphism?
Answer :There are mainly two types of polymorphism
- Compile-time Polymorphism – achieved at compile time
- Run-time Polymorphism – achieved at runtime.
3. What is Compile-time polymorphism?
Answer : In compile time polymorphism, the compiler decides which function to call based on the number, type or order of the arguments.It is achieved through:
- Function Overloading
- Operator Overloading
4. What is runtime polymorphism?
Answer:Run-time Polymorphism is achieved at runtime. It is also called Late Binding. It is achieved though :
- Function Overiding
- Virtual Functions
5. What is Function Overloading?
Answer : Function Overloading is a feature of C++ that allows us to create multiple functions with the same name but different parameter lists.The functions may differ in the following ways:
- No of parameters
- Type of parameters
- Order of parameters
6. What is Operator Overloading
Answer : Operator overloading is a feature that allows standard operators (like +, -, *, ==) to behave differently based on the data types they interact with.
7. What is polymorphism? Give an example illustrating its use in a c++ program.
Answer : In C++, polymorphism is a feature that allows the same function name or same operator to behave differently in different situations.
This program illustrates polymorphism using function overloading.
#include <iostream>
using namespace std;
int sum (int a, int b) {
return a + b;
}
float sum(float a, float b) {
return a + b;
}
int sum(int a, int b, int c) {
return a + b + c;
}
int main() {
cout << sum(2, 3) << endl; // calls int version
cout << sum(2.5, 3.5) << endl; // calls float version
cout << sum(1, 2, 3); // calls 3-parameter version
}