evaluate a sentence.

Discussion in 'C' started by Brett.h, Dec 18, 2009.

  1. Brett.h

    Brett.h New Member

    Joined:
    Dec 18, 2009
    Messages:
    5
    Likes Received:
    0
    Trophy Points:
    0
    I am writing a program where the user inputs a string, and then that string is evaluated by the program word by word, but there is one problem, how do I break it down word by word, (i am also going to use vectors),

    -Brett
     
  2. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
    Messages:
    15,365
    Likes Received:
    385
    Trophy Points:
    83
    Split it based on the spaces, comma, and fullstop
     
  3. dhakshinamoorthy

    dhakshinamoorthy New Member

    Joined:
    Dec 17, 2009
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    0
    Look at man pages for this function for extracting tokens from string

    strtok, strtok_r

    the sytax is
    char *strtok(char *str, const char *delim);



     
  4. Brett.h

    Brett.h New Member

    Joined:
    Dec 18, 2009
    Messages:
    5
    Likes Received:
    0
    Trophy Points:
    0
    Yes, this does work, but, how do I get Input from a user and evaluate that, not just a given statement already in the code?
    #include <stdio.h>
    #include <string.h>

    int main ()
    {
    char str[] ="- This, a sample string.";
    char * pch;
    printf ("Splitting string \"%s\" into tokens:\n",str);
    pch = strtok (str," ,.-");
    while (pch != NULL)
    {
    printf ("%s\n",pch);
    pch = strtok (NULL, " ,.-");
    }
    return 0;
    }
     
  5. dhakshinamoorthy

    dhakshinamoorthy New Member

    Joined:
    Dec 17, 2009
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    0
    try this function

    fgets()


    ....
    this gets a string from user........
     
  6. learn3r

    learn3r New Member

    Joined:
    Dec 19, 2009
    Messages:
    5
    Likes Received:
    0
    Trophy Points:
    0
    Occupation:
    student
    Location:
    /root
    Home Page:
    http://www.nepsecvulns.blogspot.com
    the prototype of fgets() is:
    char *fgets( char *str, int num, FILE *stream );
    you should do:
    char buffer[100];
    .............
    fgets(buffer,sizeof(buffer),stdin);
    to take input from user.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice