Creating a Doom-style 3D engine in C



How to Write Standard Code in C++

Two Methods:

There are infinitely many ways to program computers. Ultimately, it is the choice of the programmer how to accomplish what they need. There are, however, many "best practices" for styles and function usage for better compilation and safer programs. Some care should be taken to ensure that future programmers (including yourself) on your project can read and understand your code.

Steps

Writing Standard Code

  1. Download a C++ IDE (integrated development environment) such as Eclipse, Netbeans, and CodeBlocks, or you can use a plain text editor such as Notepad++ or VIM.You can also run programs from the command line, in that case any text-editor will suffice. It might be handy to choose an editor which supports syntax highlighting and line-numbers. Most programmers find that unix-like systems (linux, OS X, BSD) are the best environments for development.
  2. Create a main program file.The main file must include a function called main(). This is where execution of the program begins. From here, you should be calling functions, instantiating classes, etc. Other files of your application as well as libraries can be included into this file.
  3. Begin writing your program.Insert your code or the program that you need to build (see below for a few examples). Learn the syntax, semantics, Object-Oriented Programming paradigms, data striations, algorithm designs such as linked lists, priority queues, etc. C++ is not an easy language to program in, but doing so teaches you the fundamentals that extend to all programming languages.
  4. Insert comments in your code.Explain what your functions do and what variables are for. Choose clear names for variables and functions. Capitalize the names of global variables. In general: make sure that anyone reading your code can understand it.
  5. Use proper indenting in your code.Again, see the examples below.
  6. Compile your code with
    main.cpp
  7. Run your program by typing:
    .a.out

Following Examples

  1. Take a look at Example 1:
    /* This Is A Simple Program Just To Understand The Basic OF g++ Style. This Is A Program With g++ Compiler.*/ #include <iostream> /* include input and output functions */ usingnamespacestd/* we are using the std (standard) functions */ main/* declare the main function; you can have int main(void) too. */ " Hello Daddy"/* '\n' is a newline (\t is a tab) */ " Hello Mummy" " This Is My First Program" " Date 11/03/2007" return
  2. Consider this Example 2:
    /* This Program Calculates The Sum Of Two Numbers */ #include <iostream> usingnamespacestd main floatnum1,num2,res/* declare variables; int, double, long.. work too */ " Enter the first number= " num1/* put user's value into num1 */ " Enter the second number= " num2 res num1 num2 " The sum of "num1" and "num2 res return
  3. Learn from Example 3:
    /* Product Of Two Numbers */ #include <iostream> usingnamespacestd main floatnum1 num2 doubleres " Enter the first number= " num1 " Enter the second number= " num2 res num1 num2 " The Product of two numbers=" res return
  4. Take a look at Example 4:
    // Looping to find a math equation. In this case, it figures out the answer to // Question #1 on Project Euler. #include <iostream> usingnamespacestd main // Opening Main. sum1 sum2 sum3 sum4// Creates the integers needed in order to figure out the answer. a a aa sum1 sum1a// Loops until a is 1000 or over, adding 3 to a every loop. Also adds a to sum1. b b bb sum2 sum2b// Loops until b is 1000 or over, adding 5 to b every loop. Also adds b to sum2. c c cc sum3 sum3c// Loops until c is 1000 or over, adding 15 to c every loop. Also adds c to sum3. sum4 sum1 sum2 sum3// sum4 takes the sum of sum1 and sum2, and subtracts sum3. sum4// Outputs sum4, the answer. .// Waits for user to press enter. return// Return statement. // Closing Main.
  5. Take a look at this example of different styles:
    main i i /* This is Whitesmiths style */ main i i /* This is GNU style */ main i condition i function

Community Q&A

Search
  • Question
    Is there a site where I can learn to make projects using C++?
    JesusFreaks 1225
    Community Answer
    Sololearn.com, it teaches you the basics. If you want to get further into C++ it may require a subscription to a site. Check out the free trial and see if you think it is worth it.
    Thanks!
  • Question
    Can I write using my tablet?
    wikiHow Contributor
    Community Answer
    Yes, get an app on a tablet that has word processing, and you can use the keyboard to type stuff.
    Thanks!
  • Question
    How do I know what code will suitable for what I want to program? For example, if I want to program a social network.
    wikiHow Contributor
    Community Answer
    C++ is used more for computer programs and such. For social networks and other websites, look at HTML and PHP instead. Before you can program anything, you will have to learn the program from the beginning.
    Thanks!
  • Question
    How do I write a simple program wishing my friend exam success?
    wikiHow Contributor
    Community Answer
    #include int main() { printf("Good luck on your test"); }
    Thanks!
  • Question
    Can I develop an app with C++?
    wikiHow Contributor
    Community Answer
    Yes, but cross-integration is most likely necessary for a more dynamic experience. It's best to know Java and HTML too.
    Thanks!
  • Question
    From where can I download C++?
    wikiHow Contributor
    Community Answer
    C++ is not downloadable.
    Thanks!
  • Question
    What does "valuable int" mean?
    Bl4ckbo7
    Community Answer
    int in C++ programming is a keyword and one of the data-types in C++ language. It stands for integer.
    Thanks!
  • Question
    How do I save my C++ program code?
    Bryan Hadland
    Community Answer
    Save it in a file called "myfile.cpp".
    Thanks!
  • Question
    How do I write a simple program wishing my friend success in exams?
    Community Answer
    Enter this code: #include using namespace std; int main() { cout
    Thanks!
  • Question
    How do I save an input parameter and then re-display it onscreen?
    Community Answer
    You can save any input in a variable like an int or a double with CIN or Scanf, and then output it again whenever you need to with Cout or PrintF.
    Thanks!
Unanswered Questions
  • Can I create something like Siri that follow your command?
  • How can I go about programming in C++ on my computer?
  • As a science engineering student, which should I use for getting a base, c+ or java?
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  • Always try to use an ISO compiler with your programs.
  • 'a.out' is the name of the default executable file made by the compiler.
  • If you're writing anything that uses a lot of different variables or functions, try to include some comments so it is easier to debug and understand later on!

Warnings

  • Never use obfuscated styles or deprecated functions.

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Date: 13.12.2018, 07:07 / Views: 52253