C++ Multiple Catch Block

In C++, multiple catch blocks are used to handle different types of exceptions that might be thrown in a try block. Each catch block is designed to handle a specific type of exception. You can have multiple catch blocks to catch different exceptions or catch exceptions in different ways.

Syntax:


try {
    // Code that may throw exceptions
}
catch (exceptionType1 &e1) {
    // Code to handle exceptionType1
}
catch (exceptionType2 &e2) {
    // Code to handle exceptionType2
}
catch (...) {
    // Code to handle all other exceptions
}

Example:


#include <iostream>
#include <stdexcept> // For std::runtime_error

int main() {
    try {
        int a=10, b=0;
         if (b == 0) {
         throw std::runtime_error("Error: Division by zero");
        } else if (b < 0) {
            throw std::invalid_argument("Error: second value should not be negative.");
        }

        double result = a/b;
        std::cout << "Result: " << result << std::endl;
    }
    catch (std::runtime_error &e) {
        std::cout << "Caught a runtime_error: " << e.what() << std::endl;
    }
    catch (std::invalid_argument &e) {
        std::cout << "Caught an invalid_argument exception: " << e.what() << std::endl;
    }
    catch (...) {
        std::cout << "Caught an unknown exception." << std::endl;
    }

    return 0;
}

Exceptions:

If the divisor is zero, it throws a std::runtime_error.
If values b's value is negative, it throws a std::invalid_argument exception.
If any other unexpected exception occurs, the catch-all handler catch (…) will catch it.

Output:

Caught a runtime_error: Error: Division by zero

if b value is negative like b=-5 then output

Caught an invalid_argument exception: Error: second value should not be negative.

C++ Multiple Catch Block – Interview Questions

Q 1: What is multiple catch block?

Ans: Handling different exceptions with multiple catch blocks.

Q 2: Order of catch blocks matters?

Ans: Yes.

Q 3: Which catch block should come first?

Ans: Specific exception before general.

Q 4: Can one try block have multiple catch blocks?

Ans: Yes.

Q 5: What happens if no catch matches?

Ans: Program terminates.