I honestly am against complex programming environments while you're learning. You might have heard of Microsoft Visual Studio, Bloodshed Dev-C, Codeblocks, whatever.
It all seems easy, great. It won't be easy when you need to switch to Codeblocks from bloodshed dev C once you get in a real working environment and everyone is used to a different environment.
It's a bit more complex but bear with me. This simple knowledge is invaluable to anyone who will ever actually make money off programming.
Download and install mingw (Or minimalist GNU for windows/GNU stands for Gnu's not UNIX, that old Operating System.)
Once you have installed it, make sure to search in the windows search bar for mingw installation manager, access it and open up the Mingw Base System -> Mingw Compiler Suite -> mingw32-gcc
Check the box, apply the changes(TOP LEFT MENU: Installation->Apply changes)
Good, now you have to add this to your system's path.
Go to your system's properties (Or search for environment path in windows 10)
Go to Enviroment variables
Select the path in SYSTEM variables (NOT USER VARIABLES!!!!)
Add C:\MinGW (Or of course wherever you decided to install mingw)
Apply the changes, and you're good to go.
To check if the compiler is working properly, open up a terminal/Command prompt and type in gcc then press enter.
it should say something like : ERROR, no imput file(s)!, in which case everything is all right. Otherwise go back and see where something went wrong.
Open up a terminal, enter sudo apt-get install gcc
install it then the commands are the same as windows so follow them from there on.
You'll need a text editor such as Notepad++ Or, if you're on Linux Notepadqq(same thing really!)
You can customize the theme so it's not too white for your eyes color your font the way you want etc. it's pretty nifty.
second thing is the file manager and of course the console/terminal (Command prompt on windows, Terminal on Linux)
Really any IDE you will find will be an combination of these things in the end all of them will be an alternate look of this:
Make a folder, Wherever you want in which you will make your very first program. A standard Hello World program.
Inside it make a text file and name it main.c (Make sure your file extensions are shown otherwise it will end up being main.c.txt!)
Write the following inside
#include
int main()
{
printf("Hello World!");
return 0;
}
That's your first program, but it's just text or human readable code, we need to compile it to an executable that your computer can understand. (Don't worry I'll explain what does what very soon.)
Now go to your command prompt or terminal and type in cd "path to your main.c" without the ""
(If you're not familiar with command prompt, put the folder with the file on your desktop and type in cd Desktop after you open a console. then type in "cd foldername" where foldername is the name of the folder that holds main.c)
Once you've reached the path to your main.c type in gcc main.c -o T01
It should compile successfully if you've written everything exactly as written above in the file.
Even a misplaced comma can break an entire program, this is the strictness we deal with in programming.
The program should output "Hello World" then close.
Of course once you've compiled it there will be an T01.exe made near the main.c and you could double click it but it would close too fast for you to see the output. (or perhaps at the time you're reading this, even see the command prompt open.
For now however we are focusing on the console.
Congratulations! You've made your very first program in C!
Let's study how it works:
#include <stdio.h> - contains basic functions like printf for example, every commmand like printf is located in such a library.
int main() - the function at which your program starts, you can not have a program without this! your program will connect to anything else you do through this function.
It seems extremely simplistic, try playing with it, and i'll also show you how to have it write on a new line too "\n".
main.c
#include
int main()
{
printf("Hello World!\nThis is my first program!\n");
printf("I'm on my way to becoming a programmer!");
return 0;
}
Putting a "\n" tells the printf function that you want to write on the next line not on on the same one.
Now, having one printf next to another is pretty redundant really although it looks simpler now over time it's just more typing for no reason, I'll show you how to write it so it reads the next line in code too.
#include
int main()
{
printf("Hello World!\n"\
"This is my first program!"\n);
return 0;
}
Now you know how to write messages in order. I'll continue this lesson explaining a few basic things.
Everything probably looks weird, so here's a little more translation into english
#include <library_here.h> - accesses a file included in your c compiler installation, containing a few basic tools like printf for example.
int main() - is the main function what's inside the brackets or in between are other commands/functions to be executed.
for example:
#include
int hello()
{
printf("Hello World!");
}
int main()
{
hello();
return 0;
}
printf("message") - printf("message to write to console/terminal/etc.")-will get more into it later, I need to show you the variable types first.
and return 0 - basically closes the program, we'll get into this later as it is too complex for someone just starting output
After the end of every command, not function, you add a ";" telling the compiler your command ended.
It does not apply for functions hence the lack of it after closing the brackets "{}"
Say you need to remake notepad for example, you have a little piece of code for saving one for loading one for displaying the text one for not losing text on reboot etc. You do have the necesarry tools you're being helped by both the operating system and programming languages and toolkits to make your job easier, you're just connecting them together.
int = number such as 123
float = number such as 123.0001
double = number such as 123.0000001
char = a character such as "A" or "a" plus symbols such as "/!@#*(%&)"
if you need a simple number you use int, if you need more precision you use float if you need even more precision you use double.
A few mathematical examples:
/*By the way this is a comment, a piece of text the compiler ignores but you can keep notes inside code this way!
It's really easy!*/
//Or use this for a single line comment!
#include
int main()
{
int a = 2; //This is how we declare and assign a value to an integer or an int
int b; // this is how we declare an int, it has no value assigned to it yet.
b = 0 // we make sure it's value is 0 so no random memory errors appear.
int c = a + b; //we can also declare and assign the result of an operation such as in this case a (2) + b (0)
printf("A = %i\n", a); //&i in printf expects a variable of type int after the text ("&i", a) where a is the one we declared earlier and assigned 2 to it.
printf("B = %i\n"\
"C = %i which is the result of A + B", b,c); // this is how you would structure it correctly so you don't open up 100 printfs consuming more memory and basically wasting space.
}
You can do the same for addition substraction multiplication and division with no issue, there's a math library for more advanced math such as pow() (2 at the power of 2), sqrt() (square root of x) etc.
Notice where I assigned the value of 0 to b, it's necesarry in C to keep in mind not to use any unassigned values.
if I don't assign 0 to b, it might be 0, it might be 1, it might be 1020121 and so on, it's random, because it accesses whatever value was previously used in the space of the memory address that int b was assigned.
You don't need to worry much about this for now, I'll get to it when we have to use pointers and allocate memory.
That's it for now, since at school you've noticed everyone makes you do 20 problems of one type then another 20 of another type (Addition, substraction, etc.) slowly getting to the more complicated stuff that's how you should work when learning c++ for the first time.
Play around, make one function that says hello world, another that says hello then good bye them being in two separate functions.
Right now you only have the ability to display and make basic math with text. play around it doesn't matter what the text says the point is you must get used to the syntax and writing code.
The next tutorial will show you more on how to also receive input from a client, and make some decisions based on that input automatically.
Screenshots, title, mistakes, etc. are of my own work along with everything written here.
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Any inspirations, mostly jokes are reffered here:
commapic
memerr