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

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.

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

PLZ help !!!

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

#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 ???

> 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

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

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 );
        }
    }
}

---

thanks your a life saver !!!!!!!!!!!!!!!