Programming Forums > Application Development > C

Ooble · Aug 22nd, 2005, 1:19 PM

Nice work mate.

coldDeath · Aug 22nd, 2005, 1:36 PM

Glad that this tutorial has gone to some use an helped someone

Extra bit
While argv[n] can show you an argument, you can also find the filename too, by using argv[0]. This is because the first word you type is counted in the argv array.

I thought my indenting was ok, some things aren't aligned to well as i was having trouble with the second example.

Scorpions4ever · Aug 22nd, 2005, 8:18 PM

This part contains a lot of extremely BAD advice:

Quote:

Linux(recommended ):
Open the terminal (if you don't know how to do that, then i don't think you should use linux ) cd to the directory with the source code in. For example: cd /home/jack/cpp/myfile.cpp then to use the G++ compiler to compile it type: g++ myfile.cpp this then makes a file called a.out, you can rename it if you like. a.out is an executable, so you can run it by typing ./a.out. If you dont want to put the ./ in front you can put the a.out file into /usr/bin, that way you only have to type the filename to run the program

To make g++ create an executable filename of your choice, you should use the -o option.
g++ -o myfile myfile.cpp
this will create an executable called myfile instead of a.out.

As for executing a file, you can either type
./myfile
or set your PATH variable to include . in its path.

Quote:

export PATH=${PATH}:.
or
setenv PATH ${PATH}:.
depending on your shell.
Then you can type:
myfile
and execute it directly

There is a very good reason that . is not included in the default PATH though and it has to do with security. I'll go into the reasoning later if you want a longer explanation.

Under no condition should you put crap in /usr/bin (or any such system directory, e.g. /sbin, /bin, /usr/sbin etc.) For one, it requires root privileges and secondly, you could overwrite some valuable system utility with your test program.

Aug 22nd, 2005, 1:19 PM	#11
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Nice work mate. __________________ Me :: You :: Them

Aug 22nd, 2005, 1:36 PM	#12
coldDeath Expert Programmer Join Date: Aug 2005 Location: UK Posts: 862 Rep Power: 4	Glad that this tutorial has gone to some use an helped someone Extra bit While argv[n] can show you an argument, you can also find the filename too, by using argv[0]. This is because the first word you type is counted in the argv array. I thought my indenting was ok, some things aren't aligned to well as i was having trouble with the second example. __________________ Programming Tutorials - Linux Installation Guide - Learn Python - Learn C++ Got Slack? Join us at #programmingforums @ irc.freenode.net! My software never has bugs. It just develops random features.

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Programming Forums > Application Development > C

Arguments in C++