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Oct 23rd, 2006

how to compare stings in linked list

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i have this line of code and want to compare the word from the linked list with the one supplied by user.

the code is:

C Syntax (Toggle Plain Text)
 if (strcmp(p->word,word)==0)
 if (strcmp(p->word,word)==0)

and i am having this error:

passing `char' to argument 2 of `strcmp(const char *, const char *)' lacks a cast

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tirivamwe

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Oct 23rd, 2006

Re: how to compare stings in linked list

post the declaration of variable word. It should be

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char word[some_value];
 
or
char *word;
char word[some_value];

or
char *word;

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Oct 23rd, 2006

Re: how to compare stings in linked list

post your code

andor

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Oct 23rd, 2006

Re: how to compare stings in linked list

herer is the code of the list:

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struct doc_words
       {
        char words[30];
        struct doc_words *next;
       };
struct doc_words
       {
        char words[30];
        struct doc_words *next;
       };

and the code of the function:

C Syntax (Toggle Plain Text)
int getCount(char word)
    {
 
     int count=0;
     struct doc_words *p = head;
     while (p!=NULL)
           {
            if (strcmp(p->words,word)==0)
               {
                count++;
                p=p->next;
               }
            else
                {
                  p=p->next;
                }
     }
     return(count);
    }
int getCount(char word)
    {

     int count=0;
     struct doc_words *p = head;
     while (p!=NULL)
           {
            if (strcmp(p->words,word)==0)
               {
                count++;
                p=p->next;
               }
            else
                {
                  p=p->next;
                }
     }
     return(count);
    }

tirivamwe

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Oct 23rd, 2006

Re: how to compare stings in linked list

word is a single char and strcmp takes char *. So you need to pas strcmp(p->words,&word) as second parameter. Are you shore:
int getCount(char word) is right. Becouse there are more sense if it was int getCount(char * word)

Last edited by andor; Oct 23rd, 2006 at 9:50 am.

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Oct 23rd, 2006

Re: how to compare stings in linked list

>>int getCount(char word)

that should be like this

(Toggle Plain Text)

int getCount(char*  word)

>>strcmp(p->words,&word)
that won't work either. strcmp() expects a null-terminated string. Just passing the address of word does not make it null-terminated.

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Oct 23rd, 2006

Re: how to compare stings in linked list

Quote ...

that won't work either. strcmp() expects a null-terminated string. Just passing the address of word does not make it null-terminated.

I agree, my mistake. I didn't think just saw that strcmp accepts pointer to char. But how did he pass the whole string inside one char?!?
Ah I know the answer, he didn't.

Last edited by andor; Oct 23rd, 2006 at 10:19 am.

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Re: how to compare stings in linked list

>>Ah I know the answer, he didn't.
Your probably right -- he has not written a function that calls getCount() yet.

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Oct 23rd, 2006

Re: how to compare stings in linked list

i finally got it right my mistake was here:

C Syntax (Toggle Plain Text)
int getCount(char word)
int getCount(char word)

it should be:

C Syntax (Toggle Plain Text)
int getCount(char word[30])
int getCount(char word[30])

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