Thread: argv[]

My question is regarding the use of command line arguments. As we know that argc and argv[] can be used as arguments to be passed to main(), so whether argv[] should only be arrays of pointers to chars or whether can it be simply an integer array???
So whether main() function like this:

Code:

int main(int argc,long int argv[])

is ok??

Originally Posted by rakeshkool27

My question is regarding the use of command line arguments. As we know that argc and argv[] can be used as arguments to be passed to main(), so whether argv[] should only be arrays of pointers to chars or whether can it be simply an integer array???
So whether main() function like this:

Code:

int main(int argc,long int argv[])

is ok??

No..

Originally Posted by EVOEx

No..

so you mean to say main() arguments are good only with character strings.
So this means we cannot pass an integer in the form of arguments.
Actually I was just trying out to find the factorial by command line arguments rather than giving the input at runtime,but using "long int argv" still gave an answer.....

Originally Posted by MK27

Any kind of alphanumeric data can be in a character string, including integers.

Code:

char string[]="666";

although the integers can be passed as strings they can't be processed as integers in the program.
How to pass an integer number to main function via command line,so that i can find the factorial of the integer value???

cmd: program_name 63 14 18 hello i am a string

Code:

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

int num = atoi(argv[1]);
printf("%d",num);
return 0;
}

result : 63

Originally Posted by mushy

cmd: program_name 63 14 18 hello i am a string

Code:

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

int num = atoi(argv[1]);
printf("%d",num);
return 0;
}

result : 63

hmmmm.....quite a nice idea to work with!!!!! thanks , finally got a way to deal with

Originally Posted by MK27

A few other ways:

Code:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, const char *argv[]) {
	char string[]="666";
	int n1, n2;

// option 1
	n1 = (int)strtol(string,NULL,0);
// option 2
	sscanf(string, "%d", &n2);

	printf("%d %d\n",n1,n2);

	return 0;
}

hey MK27, i got your logic behind it.......
but couldn't understand strtol() function.....since i never found it before?

You should read the manual on strtol, by typing "man strtol" into your terminal, or Google, or your C textbook.

A few other ways:

Surely you cannot forget atoi().

rakeshkool27, documentation is a wonderful thing.

strtol - C++ Reference

Damn, beaten to it.

Thanks all of you guys, You people are really C-worm totally addicted to C. Everytime I come here I get to learn something here.....its very nice!!!! I hope that someday I shall also become a C expert like you people.....
hey I also want to tell you people something out of topic....somedays ago I went through a computer magazine in which it mentioned about the replacing of silicon by graphene-a carbon composition substance having multiple states unlike the silicon having two states. So if it replaces silicon whether the computer language shall be affected or shall it be the same??? any idea about it????

Originally Posted by MK27

I think the only thing that would effect language design is if the nature of memory changed. I think I have heard of ideas and experiments to do with non-electrical "transistors" (they are actually molecular/chemical) that can have non-binary states. I have no idea where that is supposed to go tho.

So there should not be any great harm to the existence of 'C'....