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/*************************************************************************** | |
Sort a struct array in C using qsort function | |
****************************************************************************/ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
struct Student { | |
char name[30]; | |
int id; | |
int age; | |
}; | |
//int ( * comparator ) ( const void *, const void * ) | |
int comp_by_age(const void *a, const void * b) | |
{ | |
struct Student *s1 = (struct Student *) a; | |
struct Student *s2 = (struct Student *) b; | |
return (int) (s1->age - s2->age); // ascending order by age | |
// return (int) (s1->age - s2->age); // descending order by age | |
} | |
int main() | |
{ | |
struct Student a[3]; | |
// Student 1 | |
strcpy(a[0].name, "Mehadi"); | |
a[0].id = 10; | |
a[0].age = 25 ; | |
// Student 2 | |
strcpy(a[1].name, "Hasan"); | |
a[1].id = 5; | |
a[1].age = 24 ; | |
// Student 3 | |
strcpy(a[2].name, "Menon"); | |
a[2].id = 100; | |
a[2].age = 30 ; | |
printf("%s\n", a[0].name); | |
printf("%s\n", a[1].name); | |
printf("%s\n", a[2].name); | |
//void qsort (void * base, size_t num, size_t size, int (* comparator) (const void *, const void * )); | |
qsort(a, 3, sizeof(struct Student), comp_by_age); | |
printf("\nAfter Sorting: \n"); | |
printf("%s\n", a[0].name); | |
printf("%s\n", a[1].name); | |
printf("%s\n", a[2].name); | |
return 0; | |
} |
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