INTERVIEW QUESTIONS C STRUCTURES IN C DETAILS

Question: How would you qsort() function to sort an array of structures?

Answer:

Source: CoolInterview.com

#include<stdio.h>
#include<stdlib.h>

typedef struct emp_list {
int id;
char name[10];
}EMP;

int sorting_mech( const void *ele1 , const void *ele2) {

int a,b;
a = *((int *)ele1);
b = *((int *)ele2);

if( a > b) {
return 1;
}
if(a < b ) {
return -1;
}
return 0;
}





int sorting_mech_emp( const void *ele1 , const void *ele2) {

EMP a,b;
a = *((EMP *)ele1);
b = *((EMP * )ele2);

if(a.id > b.id ) {
return 1;
}
else {
return -1;
}
return 0;
}
int main() {

int numbers[6] = {1,2,6,5,8,3};
EMP list[3] = { {10,"prash"} , {8,"praz"} , {1,"pra"} };
int i = 0;
int tot_ele;
int struct_array_elements;
tot_ele = sizeof(numbers) / sizeof(int);
struct_array_elements = sizeof(list) /sizeof(EMP);
printf("before sorting
");
for(i=0 ; i<tot_ele;i++ ) {
printf("%d ",numbers[i]);
printf("
");
}
qsort(( void * )numbers , tot_ele , sizeof(int) , sorting_mech );
printf("after the sorting !!
");
for(i=0 ; i<tot_ele;i++ ) {
printf("%d ",numbers[i]);
printf("
");
}
/* added currently*/


printf("before the sorting !!
");

for(i=0;i<struct_array_elements;i++ ) {
printf(" id: %d
name: %s",list[i].id,list[i].name);
printf("

");
}

qsort((void *)list,struct_array_elements,sizeof(EMP),sorting_mech_emp);

printf("after the sorting !!!
");
for(i=0;i<struct_array_elements;i++ ) {
printf(" id: %d
name: %s",list[i].id,list[i].name);
printf("

");

}

return 0;
}


Source: CoolInterview.com

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