Exceptions in Constructors

Medium Exception Handling in OOP

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Problem Statement

Create a `Database` class. In its constructor, if the provided integer `id` is negative, throw `std::invalid_argument(“Invalid ID”)`. Otherwise, print ‘Connected’. In `main()`, wrap the object instantiation in a try-catch block and print the error using `e.what()`.

Input Format

A single integer.

Output Format

Print 'Connected' or the exception message.

Constraints

None

Sample Input

-5

Sample Output

Invalid ID

Explanation

If a constructor cannot safely initialize an object, throwing an exception halts the creation instantly, preventing a broken object from existing in memory.

Starter Code

#include <iostream>
#include <stdexcept>

class Database {
public:
    Database(int id) {
        // Validate and throw if necessary
    }
};

int main() {
    // Read input, wrap instantiation in try-catch
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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