Tuesday, May 21, 2013

Having Trouble With The Strstr Function. - C And C++ | Dream.In.Code


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    1 Replies - 18 Views - Last Post: Today, 10:12 PM Rate Topic: -----

    #1 Flofinator ?Icon User is offline

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    • Posts: 4
    • Joined: 28-March 13

    Posted Today, 09:40 PM

    
#include <stdio.h> #include <string.h> #include <stdlib.h>  int main(void) {      char *strstr();     char sentence[80];     char search[80];     printf( "Enter a line of text: \n");     fgets(sentence, 80, stdin);     printf("Enter your search query: \n");     fgets(search, 80, stdin);     char *searchPtr;     searchPtr = strstr(sentence, search);     printf("%s\n", searchPtr); } 

    my output for -

    Enter a line of text:
    love love hotdogs /*sentence*/
    Enter your search query:
    love /*search*/
    (null)/*searchPtr*/

    but if I do this

    Enter a line of text:
    love/*sentence*/
    Enter your search query:
    love/*search*/
    love/*searchPtr*/

    obviously strstr is only pointing to the first 'string' in my array, or is only comparing my 2 strings to see if they are exact, but I am not sure why! This program is suppose to use the strstr function to point to a certain area of the sentence, and only read from that part of the sentence on. But it's hard when I can't get my pointer to point to anything!

    -Thanks, this may come down to my lack of understand of pointers, but god am I trying to get it!

    This post has been edited by jimblumberg: Today, 10:06 PM
    Reason for edit:: Added missing code tags. Please learn to use them properly.


    Is This A Good Question/Topic? 0

    Replies To: Having trouble with the strstr function.

    #2 jimblumberg ?Icon User is offline

    Reputation: 3048

    • Posts: 9,282
    • Joined: 25-December 09

    Re: Having trouble with the strstr function.

    Posted Today, 10:12 PM

    Please explain what you intend by the following snippet:
    
    char *strstr();

    Why are you trying to redefine a standard function?

    Next part of your problem is probably the new line character that is at the end of your strings. Remember that fgets() extracts the end of line character and places it into the string.

    Jim


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    Source: http://www.dreamincode.net/forums/topic/321491-having-trouble-with-the-strstr-function/

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