Default Arguments in Constructors

Medium Object Lifecycle (Constructors & Destructors)

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Problem Statement

Create a `Greeting` class taking `std::string name = “Guest”` as a default parameter in its constructor. The constructor should print ‘Hello, [name]’. Read a string. If the string is ‘NONE’, instantiate the object without arguments. Otherwise, instantiate it with the string.

Input Format

A single string.

Output Format

Print the greeting.

Constraints

String contains no spaces.

Sample Input

Alice

Sample Output

Hello, Alice

Explanation

Default arguments allow a single constructor to handle varying numbers of arguments seamlessly.

Starter Code

#include <iostream>
#include <string>

class Greeting {
public:
    // Implement constructor with default argument
};

int main() {
    std::string input;
    if (std::cin >> input) {
        // Instantiate appropriately based on input
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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