C++

Version

Running C++ on C++ v17

Supported languages

C++

Testing framework

catch2

Special reminders and implementation details

#include <catch2/catch_test_macros.hpp>
#include <iostream>
#include "app.hpp"
using namespace std;

TEST_CASE("Should return Hello World!") {
    REQUIRE(getHelloWorld() == "Hello, World!");
}

Included libraries

• catch2

Reading input (stdin)

Programs that read values use standard input. Run opens an interactive terminal: the program starts, prints its prompt, and you type the answer and press Enter, as in a real terminal. The tests of an output-test challenge feed the input themselves.

#include <iostream>
#include <string>

int main() {
    std::string name;
    std::getline(std::cin, name);
    std::cout << "Hello, " << name << "!" << std::endl;
    return 0;
}

std::getline reads one line without its newline; std::cin >> n reads a number. At end-of-file the stream's fail bit is set and the variable stays empty. Do not print a prompt before reading in output-test challenges: it would become part of the compared output.

How to debug

Debugging C++ code is crucial for every developer. One of the simplest yet effective ways to debug is by using std::cout statements.

Steps to Debug Using std::cout Statements

1. Identify the Problem Area: Locate the section of your code where you suspect the problem might be.

2. Insert std::cout Statements: Add std::cout statements before and after the suspected problematic code to print out variable values and flow control.

3. Check the Results Output of your tests

4. Analyze the Output: Look at the values printed on the results console to understand what's going wrong in your code. Adjust your code based on the findings and repeat as necessary.

Example

Here’s an example of how to use std::cout for debugging:

C++ Code

#include <iostream>

int calculate_sum(int a, int b) {
    std::cout << "calculate_sum called with arguments: " << a << ", " << b << std::endl; // Log function call
    int sum = a + b;
    std::cout << "Sum after addition: " << sum << std::endl; // Log sum calculation
    return sum;
}