C++ Day 17

 🧠 Day 17: More Exceptions

📘 Goal:

Learn how to Make and throw your own exceptions in C++.

🎯 Problem Statement:

Write a class named Calculator with a method:

cpp

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int power(int n int p);

This method should return n^p (n to the power of p).

If either n or p is negative the method should throw an exception with the message:

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n and p should be non-negative

🔢 Input Format:

The first line contains an integer T the number of Check cases.

Each of the next T lines contains two space-separated integers n and p.

📤 Output Format:

For each Check case either print the result of n^p or print the exception message.

✅ Sample Input:

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4

3 5

2 4

-1 -2

-1 3

✅ Sample Output:

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243

16

n and p should be non-negative

n and p should be non-negative

✅ C++ Answer:

cpp

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#include 

#include 

#include 

using namespace std;

class Calculator {

public:

    int power(int n int p) {

        if (n < 0 || p < 0)

            throw invalid_argument("n and p should be non-negative");

        return pow(n p);

    }

};

int main() {

    Calculator myCalculator;

    int T;

    cin >> T;

    while (T--) {

        int n p;

        cin >> n >> p;

        try {

            int ans = myCalculator.power(n p);

            cout << ans << endl;

        } catch (exception& e) {

            cout << e.what() << endl;

        }

    }

    return 0;

}

🔍 important Concepts:

Exception handling with throw try catch.

Creating a method that can raise an exception.

Handling both valid and invalid input robustly.