throw std::runtime_error("message");signals an error.try { } catch (const std::exception& e) { }handles it;e.what()returns the message.- Standard exceptions live in
<stdexcept>:invalid_argument,out_of_range,runtime_error... catch (...)catches anything.
C++ Exceptions
throw, try and catch.
✍️ 2 exercises in this lessonKey Takeaways: C++ Exceptions
Mastering C++ Exceptions helps you write clean and reliable C++ code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
C++ Exceptions Code Example
C++#include <iostream>
#include <stdexcept>
#include <vector>
double divide(double a, double b) {
if (b == 0) throw std::invalid_argument("division by zero");
return a / b;
}
int main() {
try {
std::cout << divide(10, 4) << "\n";
std::cout << divide(1, 0) << "\n";
} catch (const std::invalid_argument& e) {
std::cout << "Error: " << e.what() << "\n";
}
std::vector<int> v = {1, 2, 3};
try {
std::cout << v.at(10) << "\n";
} catch (const std::out_of_range&) {
std::cout << "Index out of range\n";
}
return 0;
}Output
2.5 Error: division by zero Index out of range
Run this example on your own computer. The "Get Started" lesson shows how to set it up.
C++ Exceptions Practice Exercises
Check what you learned in “C++ Exceptions”.
/ 2 solved
Fill in the blank
Signal an invalid argument.
std::invalid_argument("bad value");
✓ Correct!
Not quite. Try again.
Multiple choice
Which method returns an exception's message?
✓ Correct!
Not quite. Try again.
to save your exercise progress.
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