C Program for Quick Sort

How to write a C Program to Sort Array using Quick Sort with a practical example?.

C Program for Quick Sort Example

This quick sort program allows the user to enter the array size and the row elements of an Array. Next, we are using Nested For Loop to order or arrange the array elements using a quick sort.

Here, in this example, we separated the logic using Functions and Pointers. The function will swap and quick sort the Array elements.

#include <stdio.h>
void Swap(int *x, int *y) {
    int Temp;
    Temp = *x;
    *x = *y;
    *y = Temp;
}
void quickSort(int a[], int first, int last) {
    int pivot, i, j;
    if(first < last) {
        pivot = first;
        i = first;
        j = last;
        while (i < j) {
            while(a[i] <= a[pivot] && i < last)
                i++;
            while(a[j] > a[pivot])
                j--;
            if(i < j) {
                Swap(&a[i], &a[j]);
            }
        }
        Swap(&a[pivot], &a[j]);
        quickSort(a, first, j - 1);
        quickSort(a, j + 1, last);
    }
}
int main() {
    int a[100], number, i;
    printf("\n Please Enter the total Number of Elements  :  ");
    scanf("%d", &number);
    printf("\n Please Enter the Array Elements  :  ");
    for(i = 0; i < number; i++)
        scanf("%d", &a[i]);
    
    quickSort(a, 0, number - 1);
    printf("\n Selection Sort Result : ");
    for(i = 0; i < number; i++)  {
        printf(" %d \t", a[i]);
    }
    printf("\n");
    return 0;
}

Refer to C programs, Functions, Pointers, swap, and Array articles in C Programming.