quick sort implementation code example

Example 1: quick sort program in c

#include<stdio.h>
void quicksort(int number[25],int first,int last){
   int i, j, pivot, temp;

   if(first<last){
      pivot=first;
      i=first;
      j=last;

      while(i<j){
         while(number[i]<=number[pivot]&&i<last)
            i++;
         while(number[j]>number[pivot])
            j--;
         if(i<j){
            temp=number[i];
            number[i]=number[j];
            number[j]=temp;
         }
      }

      temp=number[pivot];
      number[pivot]=number[j];
      number[j]=temp;
      quicksort(number,first,j-1);
      quicksort(number,j+1,last);

   }
}

int main(){
   int i, count, number[25];

   printf("How many elements are u going to enter?: ");
   scanf("%d",&count);

   printf("Enter %d elements: ", count);
   for(i=0;i<count;i++)
      scanf("%d",&number[i]);

   quicksort(number,0,count-1);

   printf("Order of Sorted elements: ");
   for(i=0;i<count;i++)
      printf(" %d",number[i]);

   return 0;
}

Example 2: quick sort

#include<stdio.h>
int partition(int arr[], int low, int high) {
  int temp;
  int pivot = arr[high];
  int i = (low - 1); 
  for (int j = low; j <= high - 1; j++) {
    if (arr[j] <= pivot) { 
      i++; 
      temp = arr[i];
      arr[i] = arr[j];
      arr[j] = temp;
    } 
  } 
  temp = arr[i + 1];
  arr[i + 1] = arr[high];
  arr[high] = temp;
  return (i + 1); 
} 
void quick_sort(int arr[], int low, int high) { 
  if (low < high) {
    int pi = partition(arr, low, high); 
    quick_sort(arr, low, pi - 1); 
    quick_sort(arr, pi + 1, high); 
  } 
} 
int print(int arr[], int n) {
  for(int i = 0; i < n; i++) {
    printf("%d ", arr[i]);
  }
}

int main()
{
int n, i;
scanf("%d", &n);
int arr[n];
for(i = 0; i < n; i++)
{
scanf("%d", &arr[i]);
}
quick_sort(arr, 0, n - 1);
print(arr, n);
}