main (int argc,char *argv[])

[Bill Cunningham]

I have been having a little trouble with this page.

http://www.physics.drexel.edu/courses/Comp_Phys/General/C_basics/#command-line

I wanted to create a command called div that takes two parameters a
numerator and denomenator that works as such:

div 3 15

and the return should be 5. The coding on this page is pretty poor IMO.
Atleast I'm having trouble reading it so that's nothing really new. Does a
for loop always have to be used in the command line situation?

Bill

[Bill Cunningham]

Re: main (int argc,char *argv[])


[snipe]

For example:

>
#include <stdlib.h>
#include <stdio.h>
>
int main(int argc, char **argv)
{
if (argc < 3)
{
printf("Usage: div numerator denominator\n") ;
}
else
{
double numerator = strtod(argv[1], (char **) NULL);
double denominator = strtod(argv[2], (char **) NULL);
>

OK John right here. Instead of the char** cast could I just use as
main's parameter,

int argc, double* argv[]) ? Does it have to be a pointer to pointer to char
?

Bill

[Bill Cunningham]

Re: main (int argc,char *argv[])

Hi Bill-
Consider that stdlib declares..
>
typedef struct {
int quot;
int rem;
} div_t;
>
#include <stdio.h>
#include <stdlib.h>
>
int main(void) {
int x = 15, y = 3;
div_t dv = div(x, y);
printf("%d %d\n", dv.quot, dv.rem);
return 0;
}
>

Oh Thanks Joe. Here's what I was doing and it was obviously wrong.

div_t dv;
dv=div(15,3);
printf("%d%d",d v(15,3),dv.quot ,dv.rem);

I see now.

Bill

[Joe Wright]

Re: main (int argc,char *argv[])

Bill Cunningham wrote:

>Hi Bill-
>Consider that stdlib declares..
>>
> typedef struct {
> int quot;
> int rem;
> } div_t;
>>
>#include <stdio.h>
>#include <stdlib.h>
>>
>int main(void) {
> int x = 15, y = 3;
> div_t dv = div(x, y);
> printf("%d %d\n", dv.quot, dv.rem);
> return 0;
>}
>>

Oh Thanks Joe. Here's what I was doing and it was obviously wrong.
>
div_t dv;
dv=div(15,3);
printf("%d%d",d v(15,3),dv.quot ,dv.rem);
>
I see now.
>
Bill
>
>

Glad to be of help. I know you have a Space bar because you used it once
in the above snippet. If you use it more often your code might be as
pretty as mine. :-)

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---