The classical introductory exercise. Just say "Hello, World!".
"Hello, World!" is the traditional first program for beginning programming in a new language or environment.
The objectives are simple:
If everything goes well, you will be ready to fetch your first real exercise.
Make sure you have read the Installing and Running the Tests pages for C++ on exercism.io. This covers the basic information on setting up the development environment expected by the exercises.
Get the first test compiling, linking and passing by following the three rules of test-driven development. Create just enough structure by declaring namespaces, functions, classes, etc., to satisfy any compiler errors and get the test to fail. Then write just enough code to get the test to pass. Once you've done that, uncomment the next test by moving the following line past the next test.
#if defined(EXERCISM_RUN_ALL_TESTS)
This may result in compile errors as new constructs may be invoked that you haven't yet declared or defined. Again, fix the compile errors minimally to get a failing test, then change the code minimally to pass the test, refactor your implementation for readability and expressiveness and then go on to the next test.
Try to use standard C++14 facilities in preference to writing your own low-level algorithms or facilities by hand. CppReference is a wiki reference to the C++ language and standard library. If you are new to C++, but have programmed in C, beware of C traps and pitfalls.
This is an exercise to introduce users to using Exercism http://en.wikipedia.org/wiki/%22Hello,_world!%22_program
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
// Include the header file with the definitions of the functions you create.
#include "hello_world.h"
// Include the test framework.
#include "test/catch.hpp"
// Declares a single test.
TEST_CASE("test_hello")
{
// Check if your function returns "Hello, World!".
REQUIRE(hello_world::hello() == "Hello, World!");
}
#include "hello_world.h"
using namespace std;
namespace hello_world {
string hello() {
return "Hello, World!";
}
}
#if !defined(HELLO_WORLD_H)
#define HELLO_WORLD_H
#include <string>
namespace hello_world {
std::string hello();
}
#endif
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.
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