Split numbers and alpha

This is a discussion on Split numbers and alpha within the C Programming forums, part of the General Programming Boards category; need help!! how can i split digit from alpha from user input I want to extract numbers and place them ...

  1. #1
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    Angry Split numbers and alpha

    need help!! how can i split digit from alpha from user input

    I want to extract numbers and place them into char digit and print all numbers then do the same thing for alpha and print alpha separatly .

    I am a biginner c student .

    here is what i did so far.

    #include <stdio.h>
    #include <stdlib.h>
    #include <ctype.h>
    #include <string.h>
    int main(void)
    {
    char t[80];
    char line[80];
    char alpha[80];
    char digit[80];
    int k;

    printf("enter something: ");
    gets(line);

    strcpy(t,line);
    puts(t);
    for (k=0;k<strlen(t);k++)
    {

    if (isalpha(t[k]));
    strcpy(alpha,t[k]);

    if (isdigit(t[k]));
    strcpy(digit,t[k]);
    }
    puts(alpha);
    puts(digit);
    return 0;
    }

  2. #2
    ATH0 quzah's Avatar
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    Code:
    while( string[x] )
    {
        if( isdigit( string[x] ) )
        {
            digit[y++] = string[x];
        }
        else
        if( isalpha( string[x] ) )
        {
            alpha[z++] = string[x];
        }
        x++;
    }
    Assuming this is what you want, here's an easy implementation.

    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    Unregistered
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    Smile

    thanks...It works a bit sluggish but it is much better from what I came up with...

  4. #4
    ATH0 quzah's Avatar
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    How exactly is it sluggish? Even if you were using strchr and then copying chunks out at a time, you still have to go through a single character at a time. Sluggish? I think not. This is probably *THE FASTEST* implementation you're going to get. There is nothing sluggish about it.

    You have no overhead from unneeded function calls. You have at most 4 checks per loop and one assignment. I'd like to see it implemented faster. The only way to speed this up would be to replace the 'isdigit' / 'isalpha' checks with simple mathmatic comparisons.

    Quzah.
    Hope is the first step on the road to disappointment.

  5. #5
    Has a Masters in B.S.
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    the only way i see quzah to speed this up other than mentioned is some(possiblly complicated) pointer arithmetic, but the speed gain would for the most part be negligible.
    ADVISORY: This users posts are rated CP-MA, for Mature Audiences only.

  6. #6
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    Guest
    sorry dude...but perhaps sluggish was not the right word.
    what i meant is that the program keeps on putting the number 2 after I print alpha. ex: fhdgshjk2

  7. #7
    ATH0 quzah's Avatar
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    Originally posted by Unregistered
    sorry dude...but perhaps sluggish was not the right word.
    what i meant is that the program keeps on putting the number 2 after I print alpha. ex: fhdgshjk2
    Well then you're doing it wrong.

    char alpha[BUFZIS] = {0};
    char digit[BUFSIZ] = {0};
    char string[BUFSIZ] = {0};

    ... read ...
    ... loop ...

    printf("Alpha: %s\n", alpha );
    printf("Digit: %s\n", digit );

    If you're calling all of this in a loop, then you need to zero value your strings when you're done with them. Use memset or something similar.

    Quzah.
    Hope is the first step on the road to disappointment.

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