Question

How to sort a range of int array using qsort in C

Answer 1

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

#define LEN 7

void sortRange(int arr[], int start, int len);
void print_array(int arr[], int len);
int compare(const void *a, const void *b);

int main(void)
{
    int arr[LEN] = {8, 3, 5, 2, 0, 1, 7};
   
    sortRange(arr, 2, 4);
    print_array(arr, LEN);
   
    return 0;
}

void sortRange(int arr[], int start, int len)
{
    qsort(arr + start, len, sizeof(int), compare);
}

int compare(const void *a, const void *b)
{
   return ( *(int*)a - *(int*)b );
}
 
void print_array(int arr[], int len)
{
    int i;
      
    for (i = 0; i < len; i++) printf("%4d", arr[i]);
}

/*
run:
   
  8   3   0   1   2   5   7

*/

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