C++: The Ultimate Guide to Master C Programming Fast ( beginners, coding, java,php, html, database) (Programming, computer language Book 1) by Robert Hoffman

Author:Robert Hoffman [Hoffman, Robert]
Language: eng
Format: epub
Publisher: C++
Published: 2016-03-23T07:00:00+00:00

Chapter 5: Compile Time: Getting an Executable

Again, compiling goes fairly deeply into a particular field of software and deserves the amount of attention it gets. Without compilers, then high-level languages couldn’t really exist since they need a way to be translated into machine understandable code. For now, let’s just focus on what we need to fundamentally understand to change our program to an executable file.

Hopefully you haven’t closed your command prompt, because we’re about to go right back to it. Make sure the command prompt is in the correct working directory as well. An easy way to do this is to run either the dir or ls commands, which print to the screen what files are in your current working directory for Windows or Linux respectively. The only file you should see is “hello.cpp” for now.

The actual command to compile varies from machine to machine. The general form is g++ usually, with an occasional “-#” directly after it. The reason this discrepancy can happen is due to conflicting versions of the compiler being used. This can happen most likely due to various IDE’s being installed on the same machine. Another useful point is the -o flag which requires some text after it which will be the name of the executable that gets named. The default name that the compiler will use is simply "a.exe" in Windows.

If you followed the tutorial thus far, then there shouldn't be any extra text that gets printed out after the compiler runs and creates the executable file. If there's something wrong with the code that is trying to be compile, there can be some abnormally abstract error messages that will try to tell you what's wrong with the code. The most useful piece of the information that it gives you are the line numbers and the files in which they appear. They appear in the very first part of the line the error appears which follows the following pattern usually: "<filename> : <line number> : <column number>."

Here's an image of what it should look like. The point about version discrepancies is also shown here, since the laptop used here needs the version shown. I also ran the program right after the successful compilation. The part that is encircled green is the actual output.

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