Filter Sort

This is a discussion on Filter Sort within the C Programming forums, part of the General Programming Boards category; Right I have a 2D array and stored in one of the elements... is the values 1 / 0........ What ...

  1. #1
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    Filter Sort

    Right I have a 2D array and stored in one of the elements... is the values 1 / 0........ What I want to be able to do is the print the array if the value is 1 ////////////// and have another sort to print the array if the value is ==0 ......... Any ideas at the moment I am running 3 other qsorts in the same program. along the lings of this
    switch(sort) {

    case 'a':

    case 'A':

    qsort(a, n, sizeof(SLIST), sort_id);

    }

    the information for this required sort stated above is stored in

    scanf("%d",&a[i].sex);

    thanks for your time

  2. #2
    the hat of redundancy hat nvoigt's Avatar
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    For such a filtering, I wouldn't sort the array. If you need it otherwise, sort it, but for filtering go through the array in a loop and query each element with a simple if. No sort will ever match the speed of one 'if' per record.
    hth
    -nv

    She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate."

    When in doubt, read the FAQ.
    Then ask a smart question.

  3. #3
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    didn't really answer my question

    printf("\n\rOnly females, print d");
    printf("\n\rOnly males, print e\n\r");


    How can I do that when the data is stored in here

    scanf("%d",&a[i].sex);
    ???

    thanks

    greg

  4. #4
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    PLZ help !!!

  5. #5
    and the hat of wrongness Salem's Avatar
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    sorting rearrages the records into some order (say all females before all males)

    filtering is just selection, like so
    Code:
    printf("\n\rOnly females, print d"); 
    for ( i = 0 ; i < n ; i++ ) {
      if ( a[i].sex == 0 ) {
        // print the record
      }
    }
    And please don't bump your thread

  6. #6
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    just tired that and

    #include<stdio.h>

    #include <stdlib.h>

    #include <string.h>



    typedef struct surv_list SLIST;

    struct surv_list {

    int id;

    int wage;

    int age;

    int sex;

    };



    int sort_id(const void *v1, const void *v2) {

    SLIST *a1=(SLIST *)v1;

    SLIST *a2=(SLIST *)v2;



    return (a1->id - a2->id);

    }

    int sort_wage(const void *v1, const void *v2) {

    SLIST *a1=(SLIST *)v1;

    SLIST *a2=(SLIST *)v2;



    return (a1->wage - a2->wage);

    }

    int sort_age(const void *v1, const void *v2) {

    SLIST *a1=(SLIST *)v1;

    SLIST *a2=(SLIST *)v2;



    return (a1->age - a2->age);

    }

    int main()

    {

    int t;

    char sort;

    int /* PersonID,Wage,Sex,Age, */ n, i;

    SLIST a[10], *aptr=a;

    printf("please enter the amount of people you will use \n");

    scanf("%d",&n);

    printf("\n=%d\n\n", n);

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

    {

    printf("please enter the Person ID (person %d)\n", i);

    scanf("%d",&a[i].id);

    printf("please enter the Wage (person %d)\n", i);

    scanf("%d",&a[i].wage);

    printf("please enter the Age(person %d)\n", i);

    scanf("%d",&a[i].age);

    printf("please enter the Sex use 1 for male and 0 for female(person %d)\n", i);

    scanf("%d",&a[i].sex);

    }



    printf("\t Survey Data:\n");

    printf("\t~~~~~~~~~~~~~~~~~~~\n");

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

    {

    printf("Person %d\t", i);

    printf("ID: %d\t", a[i].id);

    printf("Wage: %d\t", a[i].wage);

    printf("Sex: %d\t", a[i].sex);

    printf("Age: %d\t\n", a[i].age);
    }



    t=1;

    while (t==1)

    {

    printf("\n\rHow do you want the data to be sorted ?");

    printf("\n\rAscending by Person ID,type a");

    printf("\n\rAscending by Wage, type b");

    printf("\n\rAscending by Age, type c");

    printf("\n\rOnly females, print d");

    printf("\n\rOnly males, print e\n\r");

    scanf("\n%c",&sort);
    switch(sort) {

    case 'a':

    case 'A':

    qsort(a, n, sizeof(SLIST), sort_id);

    }
    switch(sort) {

    case 'b':

    case 'B':

    qsort(a, n, sizeof(SLIST), sort_wage);

    }
    switch(sort) {

    case 'c':

    case 'C':

    qsort(a, n, sizeof(SLIST), sort_age);

    }
    if(sort='d')

    {
    for ( i = 0 ; i < n ; i++ ) {
    if ( a[i].sex == 0 ) {

    printf("\t Survey Data:\n");

    printf("\t~~~~~~~~~~~~~~~~~~~\n");

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

    {

    printf("Person %d\t", i);

    printf("ID: %d\t", a[i].id);

    printf("Wage: %d\t", a[i].wage);

    printf("Sex: %d\t", a[i].sex);

    printf("Age: %d\t\n", a[i].age);
    }


    }
    if(sort='e')

    {
    for ( i = 0 ; i < n ; i++ ) {
    if ( a[i].sex == 1 ) {

    printf("\t Survey Data:\n");

    printf("\t~~~~~~~~~~~~~~~~~~~\n");

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

    {

    printf("Person %d\t", i);

    printf("ID: %d\t", a[i].id);

    printf("Wage: %d\t", a[i].wage);

    printf("Sex: %d\t", a[i].sex);

    printf("Age: %d\t\n", a[i].age);
    }


    }
    printf("\t Survey Data:\n");

    printf("\t~~~~~~~~~~~~~~~~~~~\n");

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

    {

    printf("Person %d\t", i);

    printf("ID: %d\t", a[i].id);

    printf("Wage: %d\t", a[i].wage);

    printf("Sex: %d\t", a[i].sex);

    printf("Age: %d\t\n", a[i].age);
    }



    printf("Would you like to sort the data again Yes = 1 No = 0 \n");

    scanf("%d",&t);
    }
    }
    }
    }
    }


    }






    HMMM doesn't work Salem ...... have I done something wrong ???

  7. #7
    and the hat of wrongness Salem's Avatar
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    > have I done something wrong ???
    Continual failure to read
    http://www.cprogramming.com/cboard/m...bbcode#buttons
    and figuring out that
    &#91;code]
    // paste code here
    &#91;/code]
    is a good idea

    > if(sort='d')
    should be
    if(sort=='d')

    Ditto for 'e'

    Which compiler are you using?
    Most modern compilers will warn you of this, if you turn on enough warning enabling flags.

    For instance, with gcc - you would use the -Wall flag
    gcc -Wall prog.c

  8. #8
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    I am using visual studio 6 ......... didn't solve anything unfortunately V_V

  9. #9
    and the hat of wrongness Salem's Avatar
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    Code:
    /* You have this */
    if(sort=='d') { 
        for(i = 0 ; i < n ; i++) { 
            if(a[i].sex == 0) { 
                printf( "\t Survey Data:\n" ); 
                printf( "\t~~~~~~~~~~~~~~~~~~~\n" ); 
                for(i=0; i<n; i++) { 
                    printf( "Person %d\t", i ); 
                    printf( "ID: %d\t", a[i].id ); 
                    printf( "Wage: %d\t", a[i].wage ); 
                    printf( "Sex: %d\t", a[i].sex ); 
                    printf( "Age: %d\t\n", a[i].age ); 
                }
            }
        }
    }
    
    /* you should try this */
    if(sort=='d') { 
        printf( "\t Survey Data:\n" ); 
        printf( "\t~~~~~~~~~~~~~~~~~~~\n" ); 
        for(i = 0 ; i < n ; i++) { 
            if(a[i].sex == 0) { 
                printf( "Person %d\t", i ); 
                printf( "ID: %d\t", a[i].id ); 
                printf( "Wage: %d\t", a[i].wage ); 
                printf( "Sex: %d\t", a[i].sex ); 
                printf( "Age: %d\t\n", a[i].age ); 
            }
        }
    }

  10. #10
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    thanks your a life saver !!!!!!!!!!!!!!!

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