How to search an array within a structure using bsearch in c

Question

Please help I don't understand why I can't search an element in an array within a structure to another array within another structure. Thank you for your help guys would really appreciate it.

#include<stdio.h>
#include<stdlib.h>
#define MAX 10

typedef struct{
    int elements[MAX];
    int count;
}SET;

int cmpfunc(const void * a, const void * b) {
   return (*(int*)a > *(int*)b) - (*(int*)a < *(int*)b);
}

void print(SET *s1, SET *s2){
    int *p;
    p = bsearch(&s2->elements[1],&s1->elements,s1->count,sizeof(s1->elements),cmpfunc);
    printf("%p",p);

    return;
}

int main () {
    SET s1 = {{5,20,29,32,63},5};
    SET s2 = {{1,29,3,5},4};

    print(&s1,&s2);

   return(0);
}

you should enhance your question with expected result and maybe explain in more detail. — MattOpen, Mar 12 '20 at 08:11

Vlad from Moscow · Accepted Answer · 2020-03-12T08:22:41.207

0

You need to use

sizeof(*s1->elements)

that is the same as

sizeof( int )

instead of

sizeof(s1->elements)

in the call of bsearch.

Also instead of

&s1->elements

use

s1->elements

The call will look like

bsearch( &s2->elements[1], s1->elements, s1->count, sizeof(*s1->elements), cmpfunc );

Pay attention to that the conversion specifier %x may not be used with pointers. Use either %p or dereference the found pointer and use %x provided that the target value is found.

edited Mar 12 '20 at 08:22

answered Mar 12 '20 at 08:15

Vlad from Moscow

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Thank you very much sir @Vlad it just solved my problem. ^_^ – java.begginer Mar 12 '20 at 08:22

How to search an array within a structure using bsearch in c

1 Answers1