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C > Sorting Searching Code Examples

Qcksort, quick sort [array]

Qcksort, quick sort [array]

#include <stdio.h>

#define MAXARRAY 10

void quicksort(int arr[], int low, int high);

int main(void) {
 int array[MAXARRAY] = {0};
 int i = 0;

 /* load some random values into the array */
 for(i = 0; i < MAXARRAY; i++)
  array[i] = rand() % 100; 

 /* print the original array */
 printf("Before quicksort: ");
 for(i = 0; i < MAXARRAY; i++) {
  printf(" %d ", array[i]); 
 }
 printf("\n");

 quicksort(array, 0, (MAXARRAY - 1));

 /* print the `quicksorted' array */
 printf("After  quicksort: ");
 for(i = 0; i < MAXARRAY; i++) {
  printf(" %d ", array[i]); 
 }
 printf("\n");

 return 0;
}

/* sort everything inbetween `low' <-> `high' */
void quicksort(int arr[], int low, int high) {
 int i = low;
 int j = high;
 int y = 0;
 /* compare value */
 int z = arr[(low + high) / 2];

 /* partition */
 do {
  /* find member above ... */
  while(arr[i] < z) i++;

  /* find element below ... */
  while(arr[j] > z) j--;

  if(i <= j) {
   /* swap two elements */
   y = arr[i];
   arr[i] = arr[j]; 
   arr[j] = y;
   i++; 
   j--;
  }
 } while(i <= j);

 /* recurse */
 if(low < j) 
  quicksort(arr, low, j);

 if(i < high) 
  quicksort(arr, i, high); 
}

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