Print middle of a given list

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  1. #1
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    Print middle of a given list

    How can i print the middle of given list?
    example:
    Input: aaa bbb ccc ddd eee
    Output: ccc

    how can this code to be done?

  2. #2
    C++ Witch laserlight's Avatar
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    Just get the element and print it

    Exactly how to do this depends on the specifics, e.g., a linked list?
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  3. #3
    and the hat of wrongness Salem's Avatar
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    You mean the middle of a linked list?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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    yup. example i input a sentence: hello my name is alex. so i will get the output: name <-- middle in the list.

  5. #5
    C++ Witch laserlight's Avatar
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    Indeed. What ideas do you have to solve this?
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    actually this is my tomorrow lab test question. i really can't figure out this coding. how can we calculate the middle of the string?

  7. #7
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    The middle of the string? I thought you want the middle of a linked list? You need to be clear as to the problem that you are trying to solve.
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    whats the different between string and linked list? cause i thought we have input a sentence after that look for middle word of the sentence.
    Code:
     char str[50]
            printf("\n\n\t Enter A Sentence: ");
            gets(str);

  9. #9
    and the hat of wrongness Salem's Avatar
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    I guess you're supposed to use your experience gained from your previous assignment
    Count word in a string.

    Once you know what N is, you do the loop again and stop at N/2
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    Oh thanks. Okay i take a try first.

  11. #11
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    Erm. Can someone help me on the coding? so example the loop is ( int i =0; i<=n; i++) how can i stop the loop at middle?

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    Most likely it should be

    for (int i=0; i < n; i++)

    If n is the number of words there are, and say there are 9 words for example, and i counts how many words you have seen so far, then as soon as i == 4, the "current word" must be the middle word of your text.

    To get the result of 4, of course you do integer division: n/2

    You must first be able to detect where words are... you asked about this in the other thread.

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    can someone check with my coding?
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <ctype.h>
    #include <conio.h>
    
    int main()
    {
    
    char ip[]="Input string";
    int size=strlen(ip);
    char *word[size];
    int loop;
    word[0]=strtok(ip," ");
        for(loop=0;loop<size;loop++)
       {
        word[loop]=strtok(NULL," ");
        if(word[loop]==NULL)
          break;
    }
    
    // to print the middle element
    
    int mid=size/2;
    printf("word is %s.\n",word[mid]);
    
    getch();
    return 0;
    }

  14. #14
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    See comments in the code:
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <ctype.h>
    #include <conio.h>
    
    int main()
    {
    
    char ip[]="Input string";
    int size=strlen(ip);          // size is the number of characters in ip (12)
    char *word[size];
    int loop;
    word[0]=strtok(ip," ");        // here word[0] points to the first word in ip ("Input")
        for(loop=0;loop<size;loop++)
       {
        word[loop]=strtok(NULL," ");   //  loop == 0 at the first iteration,
                                       //  thus you overwrite the value of word[0]
        if(word[loop]==NULL)
          break;
    }
    
    // to print the middle element
    
    int mid=size/2;          // size is still the number of characters (12)
                             // thus mid == 6
    printf("word is %s.\n",word[mid]);     // word[6] is uninitialised and very
                                           // likely pointing to garbage
                                         
    getch();            // why not the standard getchar()?
    return 0;
    }
    You should count the number of words in the string and not the characters if you want to find the middle word.

    Bye, Andreas

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