dynamic array

[slok]

I have a program which takes in arguments.
The first argument is a string of legal characters
eg. myprog abcdef ..."a", "b", "c", "d" etc..
are all legal characters in this case.

how can I assign this string to a variable?

my main function is as follows:

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

}

 

[slok]

also, how can I extract the first character from the
1st argument?

will need to use the 1st character as a default entry
if user don't key in anything within a timeframe.

 

[SwapSawe]

Hey, try to be a bit more explanatory...however I couldn't get what you wish to do, I will answer two of ur question the way I have interpreted them.

to assign the argument accepted from user to string, say
#include <stdio.h>
#include <string.h>
int main(int argc, char argv[])
{
char *str;
char ch;
strcpy(str,argv[1]);
// to get the first character use
ch = argv[1][0];
printf(&quot;The string is : %s and character is %c&quot;,str,ch);
}

Hope that helps,
If u need something else try to give a sample code and better prob. def.
Regards,
SwapSawe.

 

[rbobbitt]

Swap, in this line you're copying into an uninitialized pointer:

char *str;

/* ... */

strcpy(str,argv[1]);

You have to allocate memory for str first:

#include <stdlib.h>
#include <string.h>

/* ... */

str=malloc(strlen(argv[1])+1);

if (str!=NULL) {
strcpy(str,argv[1]);
/* ... */

Or just set str to point to it:

str=argv[1];

Or you could just get this stuff without using separate variables:

printf(&quot;The string is : %s and character is %c&quot;,argv[1],argv[1][0]);

Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts