Parameters

[CyBerFirEZ]

Could anyone please tell me how to make a command where i can add parameters. I've searched on the internet but I dont get it!
Can anyone help?
Thanks

P.S I've just been doing this for a week, and Im a kid so be instructive and sympathetic.

:-)

[JosAH]

Could anyone please tell me how to make a command where i can add parameters. I've searched on the internet but I dont get it!
Can anyone help?
Thanks

P.S I've just been doing this for a week, and Im a kid so be instructive and sympathetic.

:-)

Do you know about argc and argv? They're both the parameters to the main function:

int main(int argc, char* argv[]) {
   ...
}
 

The first parameter equals the number of parameters supplied to you program
plus one. argv[0] equals the name of your program itself. The other argv[i] equal
the parameter i supplied to your program. Do this for starters:

#include <stdio.h>
 
int main(int argc, char* argv) {
   int i;
   printf("argc= %d\n", argc);
   for (i= 0; i < argc;i++)
      printf("argv[%d]= %s\n", i, argv[i]);
   return 0;
}
 

kind regards,

Jos

[CyBerFirEZ]

thanks a lot for your help. I'm making mathematical programs. I've got loads, but I just wanted to compile them all into 1 program.
I tried simulating parameters using IF and ELSE IF etc.
but it was a nightmare

[sicarie]

thanks a lot for your help. I'm making mathematical programs. I've got loads, but I just wanted to compile them all into 1 program.
I tried simulating parameters using IF and ELSE IF etc.
but it was a nightmare

If you have multiple functions, I'd recommend either making them methods of a class, or just making them functions in your main (depending on how big your main is and how big your functions are). Then you can call them as desired passing whatever values you want. This is also a good way to abstract them.

[JosAH]

thanks a lot for your help. I'm making mathematical programs. I've got loads, but I just wanted to compile them all into 1 program.
I tried simulating parameters using IF and ELSE IF etc.
but it was a nightmare

You bet; if you're programming in C++ you'd better build an abstract class
that can give it's name and the number of arguments it needs. Then populate
a map with names and concrete subclasses of that abstract class.

Your main() function then expects the name of the 'function' followed by its
arguments. Find the name in the map and invoke some method of the class
given the correct number of arguments.

kind regards,

Jos

[CyBerFirEZ]

that parameter code snippet you gave me above...it kept coming up with a system.AcessViolationError thing.
It kept closing after printing on the screen
Argc=1

[CyBerFirEZ]

whats an abstract class!

[sicarie]

whats an abstract class!

That sounds like a fantastic question for google, ask, yahoo, etc...

A topic like that is so broad and general that it would be difficult if not impossible to convey to you in this format. Try researching it.