Split a string into two parts and save as two variables

Ali.B · 08-11-2009, 02:29 PM

hello guys...

I need to split the following string and save each part as a separate variable.

Code:

"00500+00611"

there string always will have 5 digits, a Plus (+) sign in the middle and 5 digits on the other side. so its always following the same structure.

i want to save "00500" as char xcoord, and "00611" as char ycoord. how would i do that? i tired strtok() but i could only extract one digit, here's my code:

Code:

int main()
{
	char Text[80] = {0};
	char * line = "GET /send.htm?Text=START+00500+11611 HTTP/1.1";
	char *s,*t;
	char * xcoord;
	char * ycoord;

	if(s = strchr(line, '+')) 
	{
		if(t = strchr(s, ' '))
			strncpy(Text, s+1, t-s);
	}
        // at this point Text will be 00500+11611
	//xcoord = strtok (Text, "+");
	printf("%s\n", xcoord);
        //at this point xcoord will be 00500
	printf("%s\n", Text);
}

thanking you in advance

Dino · 08-11-2009, 02:39 PM

Find the address of the plus sign using strchr(). Then, add 1 to that address and that's the address of the 2nd half. You already have the address of the first. memcpy() would work fine.

nonoob · 08-11-2009, 02:43 PM

Since your xcoord and ycoord are char pointers would you be satisfied with assigning these?

Code:

xcoord = s + 1;
ycoord = xcoord + 6;

... probably not. You want the numbers converted to integers?

Code:

sscanf(xcoord, "%d", &ixcoord);
sscanf(ycoord, "%d", &iycoord);

Something like that. I haven't tested.

Ali.B · 08-11-2009, 03:19 PM

Quote:

xcoord = s + 1;
ycoord = xcoord + 6;

this didn' work for me , I don't need to convert those to integers, just save them as two char variables. how would i do that?

tabstop · 08-11-2009, 03:28 PM

Quote:

Originally Posted by Ali.B

this didn' work for me , I don't need to convert those to integers, just save them as two char variables. how would i do that?

You can't store a string as a char variable, because a char variable can only hold one char, not six as needed here.

MK27 · 08-11-2009, 03:57 PM

Quote:

Originally Posted by Ali.B

this didn' work for me , I don't need to convert those to integers, just save them as two char variables. how would i do that?

This was not intend to convert them to integers, it's pointer arithmetic:

Code:

char x[] = "00500+00611";
/*          012345   */
char *plus = x + 5;

To extract the second digit with strtok:

Code:

char x[]="00500+00611", *tok1=strtok(x,"+"), *tok2=strtok(NULL,"+");
printf("%s\n%s\n",tok1,tok2);

Ali.B · 08-11-2009, 04:02 PM

Quote:

Originally Posted by tabstop

You can't store a string as a char variable, because a char variable can only hold one char, not six as needed here.

right, i meant to store is as string, like "00611" as one string and "00500" as another string... how could i do that?

MK27 · 08-11-2009, 04:03 PM

Quote:

Originally Posted by Ali.B

right, i meant to store is as string, like "00611" as one string and "00500" as another string... how could i do that?

You can use strtok, you just did not do it properly, I presume (see my last post).

You could do the same thing as strtok this way:

Code:

	char x[]="00500+00611", *y=x+6;
	x[5]=0;
	printf("%s\n%s\n",x,y);

tabstop · 08-11-2009, 04:05 PM

Quote:

Originally Posted by Ali.B

right, i meant to store is as string, like "00611" as one string and "00500" as another string... how could i do that?

Probably as

Code:

xcoord = Text;
/* You may want to do:
   xcoord[5] = '\0';
   so that you don't print the y with the x, but this will change Text as well
*/
ycoord = Text+6;

Ali.B · 08-11-2009, 04:08 PM

yes... problem solved...
thanks MK27... i didn't see your first post.... it workd perfectly and i could exctract both parts

many thanks

08-11-2009, 02:29 PM	#1
Ali.B Registered User Join Date: Jan 2009 Posts: 37	Split a string into two parts and save as two variables hello guys... I need to split the following string and save each part as a separate variable. Code: "00500+00611" there string always will have 5 digits, a Plus (+) sign in the middle and 5 digits on the other side. so its always following the same structure. i want to save "00500" as char xcoord, and "00611" as char ycoord. how would i do that? i tired strtok() but i could only extract one digit, here's my code: Code: int main() { char Text[80] = {0}; char * line = "GET /send.htm?Text=START+00500+11611 HTTP/1.1"; char s,t; char * xcoord; char * ycoord; if(s = strchr(line, '+')) { if(t = strchr(s, ' ')) strncpy(Text, s+1, t-s); } // at this point Text will be 00500+11611 //xcoord = strtok (Text, "+"); printf("%s\n", xcoord); //at this point xcoord will be 00500 printf("%s\n", Text); } thanking you in advance
Ali.B is offline

08-11-2009, 02:39 PM	#2
Dino Jack of many languages Join Date: Nov 2007 Location: Katy, Texas Posts: 1,929	Find the address of the plus sign using strchr(). Then, add 1 to that address and that's the address of the 2nd half. You already have the address of the first. memcpy() would work fine. __________________ Mac and Windows cross platform programmer. Ruby lover. Memorable Quotes From Recent Posts: I can't remember.
Dino is offline

08-11-2009, 02:43 PM	#3
nonoob Registered User Join Date: Sep 2008 Location: Toronto, Canada Posts: 507	Since your xcoord and ycoord are char pointers would you be satisfied with assigning these? Code: xcoord = s + 1; ycoord = xcoord + 6; ... probably not. You want the numbers converted to integers? Code: sscanf(xcoord, "%d", &ixcoord); sscanf(ycoord, "%d", &iycoord); Something like that. I haven't tested.
nonoob is offline

08-11-2009, 04:08 PM	#10
Ali.B Registered User Join Date: Jan 2009 Posts: 37	yes... problem solved... thanks MK27... i didn't see your first post.... it workd perfectly and i could exctract both parts many thanks
Ali.B is offline

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Passing an array into a function	Ryston	C++ Programming	4	08-29-2006 05:20 AM
Access Violation?	rwmarsh	C++ Programming	6	05-04-2006 10:56 AM
Binary Search Trees Part III	Prelude	A Brief History of Cprogramming.com	16	10-02-2004 03:00 PM
Can someone help me understand this example program	Guti14	C Programming	6	09-06-2004 12:19 PM
Request for comments	Prelude	A Brief History of Cprogramming.com	15	01-02-2004 10:33 AM