Dividing a string to words

bahada · 04-20-2009, 01:04 AM

Hi, I want divide a string (which is composed of words), to words, and I want to keep these words somewhere in memory. To be more clear there is a sentence like:

Code:

weather is so warm today

I need to take each word one by one, and I need to edit them. I can't use any functions from libraries except "stdio.h".

Could you give me an idea how can I do that?
Thanks

bahada

bithub · 04-20-2009, 01:17 AM

Well, you need to parse through the string looking for the spaces so that you can split up the string. You can start by just iterating through the string printing out the characters:

Code:

#include <stdio.h>

int main(void)
{
    char sentence[] = "weather is so warm today";
    // Put code here to print out the string.  Print it out letter by letter with the putchar() function
    return 0;
}

bahada · 04-20-2009, 01:31 AM

I'm sorrry but I couldn't understand why would I use putchar(), I don't want to print them as they are, I need to edit them before. Can you give me an idea how can I parse them. Thanks.

bithub · 04-20-2009, 01:35 AM

The point is not to print the characters. The point is to access them individually so that you can parse the string. Asking you to print them out with putchar() is just so you know you are parsing through each of the characters.

I can just give you the code to do it, but that wouldn't teach you anything. Think about the problem for a few minutes. How could you access each character individually? I'll give you another hint:

Code:

#include <stdio.h>

int main(void)
{
    char sentence[] = "weather is so warm today";
    char* p = sentence;
    printf("The first character in the string is: %c\n", *p);
    // Put code here to print out the string.  Print it out letter by letter with the putchar() function
    return 0;
}

vart · 04-20-2009, 03:39 AM

sscanf is from stdio.h

%s will give a word %n will give position where parsing stopped, so next sscanf could continue from it

bahada · 04-20-2009, 01:20 PM

Well, can any of you show me that how can I hold only first letters of these words, tabs and backspaces can exist between words:

like this is the string:
weather is so warm today

and i want to print w, i, s, w, t

thanks

bithub · 04-20-2009, 02:14 PM

Have you made an attempt to solve this yet? If so, post your code and we will help you. No one here is going to do your homework assignment for you though.

slingerland3g · 04-20-2009, 02:30 PM

Do you know that a string in c is really an array of chars. So how would you access an element within an array?

shiryu3 · 04-20-2009, 05:16 PM

This is just silly

Code:

#include <stdio.h>
void main()
{
        char str[80] = "weather is so warm today" ;
        char *m = str ;
        char word[30] ;
        int x ;

        while ( sscanf(m,"%s %n",word,&x) != EOF )
        {
                printf("%s\n", word) ;
                m+=x ;
        }
}

/*  Output

$ ./a.out
weather
is
so
warm
today

/*

quzah · 04-20-2009, 05:23 PM

Way to go moron. Do you see that big list of posts ahead of yours where we DIDN'T DO THEIR HOMEWORK FOR THEM?

PS: main returns an int.

Quzah.

shiryu3 · 04-20-2009, 05:38 PM

Quote:

Originally Posted by quzah

Way to go moron. Do you see that big list of posts ahead of yours where we DIDN'T DO THEIR HOMEWORK FOR THEM?

PS: main returns an int.

Quzah.

Well main() returns whatever I want to. I've seen it commonly fly both ways as void and int in various books.

As for posting a solution I wanted to try it out for myself, I didn't know about the %n trick. The requester can make a choice on learning the programming of turning in something copied. I do recommend learning approach as its tough to advance into the follow up classes copying your way through.

quzah · 04-20-2009, 05:48 PM

Quote:

Originally Posted by shiryu3

Well main() returns whatever I want to. I've seen it commonly fly both ways as void and int in various books.

I've seen people drive through red lights. It doesn't make it the right way to drive.

Quzah.

shiryu3 · 04-20-2009, 07:08 PM

On my planet a drivers handbook clearly tells us to stop at stop signs and red lights, unless otherwise instructed by a law enforcement officer. However in many C programming books little midget demo programs like 'Hello World' or the code printed above do not have a need to return an int with main()

bithub · 04-20-2009, 07:33 PM

Quote:

Originally Posted by shiryu3

On my planet a drivers handbook clearly tells us to stop at stop signs and red lights, unless otherwise instructed by a law enforcement officer. However in many C programming books little midget demo programs like 'Hello World' or the code printed above do not have a need to return an int with main()

In the C world, we also have a little handbook (called the C standard) which tells us what we can and what we cannot do. That standard tells us main can be defined 2 different ways:

Code:

int main(void);
int main(int argc, char* argv[]);

bahada · 04-21-2009, 03:53 AM

I tried something but I couldn't succeed and printing only first letters is really not a homework of me I just wondered how to do it. I am sorry If I broke the rules and thanks for helping.

04-20-2009, 01:04 AM	#1
bahada Registered User Join Date: Apr 2009 Posts: 10	Dividing a string to words Hi, I want divide a string (which is composed of words), to words, and I want to keep these words somewhere in memory. To be more clear there is a sentence like: Code: weather is so warm today I need to take each word one by one, and I need to edit them. I can't use any functions from libraries except "stdio.h". Could you give me an idea how can I do that? Thanks bahada
bahada is offline

04-20-2009, 01:17 AM	#2
bithub Registered User Join Date: Sep 2004 Location: California Posts: 2,845	Well, you need to parse through the string looking for the spaces so that you can split up the string. You can start by just iterating through the string printing out the characters: Code: #include <stdio.h> int main(void) { char sentence[] = "weather is so warm today"; // Put code here to print out the string. Print it out letter by letter with the putchar() function return 0; }
bithub is offline

04-20-2009, 01:31 AM	#3
bahada Registered User Join Date: Apr 2009 Posts: 10	I'm sorrry but I couldn't understand why would I use putchar(), I don't want to print them as they are, I need to edit them before. Can you give me an idea how can I parse them. Thanks.
bahada is offline

04-20-2009, 01:35 AM	#4
bithub Registered User Join Date: Sep 2004 Location: California Posts: 2,845	The point is not to print the characters. The point is to access them individually so that you can parse the string. Asking you to print them out with putchar() is just so you know you are parsing through each of the characters. I can just give you the code to do it, but that wouldn't teach you anything. Think about the problem for a few minutes. How could you access each character individually? I'll give you another hint: Code: #include <stdio.h> int main(void) { char sentence[] = "weather is so warm today"; char* p = sentence; printf("The first character in the string is: %c\n", *p); // Put code here to print out the string. Print it out letter by letter with the putchar() function return 0; }
bithub is offline

04-20-2009, 03:39 AM	#5
vart CSharpener Join Date: Oct 2006 Posts: 5,242	sscanf is from stdio.h %s will give a word %n will give position where parsing stopped, so next sscanf could continue from it __________________ If I have eight hours for cutting wood, I spend six sharpening my axe.
vart is offline

04-20-2009, 01:20 PM	#6
bahada Registered User Join Date: Apr 2009 Posts: 10	Well, can any of you show me that how can I hold only first letters of these words, tabs and backspaces can exist between words: like this is the string: weather is so warm today and i want to print w, i, s, w, t thanks
bahada is offline

04-20-2009, 02:14 PM	#7
bithub Registered User Join Date: Sep 2004 Location: California Posts: 2,845	Have you made an attempt to solve this yet? If so, post your code and we will help you. No one here is going to do your homework assignment for you though.
bithub is offline

04-20-2009, 02:30 PM	#8
slingerland3g Registered User Join Date: Jan 2008 Location: Seattle Posts: 476	Do you know that a string in c is really an array of chars. So how would you access an element within an array?
slingerland3g is offline

04-20-2009, 05:23 PM	#10
quzah +++ OK NO CARRIER Join Date: Oct 2001 Posts: 10,262	Way to go moron. Do you see that big list of posts ahead of yours where we DIDN'T DO THEIR HOMEWORK FOR THEM? PS: main returns an int. Quzah. __________________ Hundreds of thousands of dipshits can't be wrong. Are you up for the suck?
quzah is offline

04-20-2009, 07:08 PM	#13
shiryu3 Registered User Join Date: Mar 2009 Posts: 19	On my planet a drivers handbook clearly tells us to stop at stop signs and red lights, unless otherwise instructed by a law enforcement officer. However in many C programming books little midget demo programs like 'Hello World' or the code printed above do not have a need to return an int with main()
shiryu3 is offline

04-21-2009, 03:53 AM	#15
bahada Registered User Join Date: Apr 2009 Posts: 10	I tried something but I couldn't succeed and printing only first letters is really not a homework of me I just wondered how to do it. I am sorry If I broke the rules and thanks for helping.
bahada is offline

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