Quick Sort in C

Published on 28 April 2022 (Updated: 25 September 2022)

Quick Sort in C

Welcome to the Quick Sort in C page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

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

long long get_val(int tmp[],int len){
    long long value=0,mult=1;
    for(int i=len-1;i>-1;--i){
        if(tmp[i]==' '-'0'){
            printf("Usage: please provide a list of at least two integers to sort in the format \"1, 2, 3, 4, 5\"\n");
            exit(0);
        }
        value+=tmp[i]*mult;
        mult*=10;
    }
    return value;
}


void swap(long long* a, long long* b) 
{ 
    int t = *a; 
    *a = *b; 
    *b = t; 
} 

int partition (long long arr[], int low, int high) 
{ 
    long long pivot = arr[high];    
    int i = low-1;

    for (int j = low; j <= high- 1; j++) 
    { 
        if (arr[j] < pivot) 
        { 
            i++;
            swap(&arr[i], &arr[j]); 
        } 
    } 
    swap(&arr[i + 1], &arr[high]); 
    return i+1; 
} 

void quickSort(long long arr[], int low, int high) 
{ 
    if (low < high) 
    { 
        int pi = partition(arr, low, high); 
        quickSort(arr, low, pi - 1); 
        quickSort(arr, pi + 1, high); 
    } 
} 

void print(long long arr[], int size) 
{ 
    for (int i=0; i < size; i++) 
    {
        printf("%lld", arr[i]); 
        if(i!=size-1)printf(", ");
    }
        
    printf("\n"); 
} 

int main(int argc,char **argv)
{
    while(argv[1]==NULL||strlen(argv[1])==0){
        printf("Usage: please provide a list of at least two integers to sort in the format \"1, 2, 3, 4, 5\"\n");
        return 0;
    }
    int len = strlen(argv[1]);
    int tmp[10];
    int ind=0;
    int pos=0;
    long long arr[100000];

    for(int i=0;i<len;++i){
        if(argv[1][i]==','){
            long long val = get_val(tmp,ind);
            ind=0;
            i++;
            arr[pos++]=val;
            continue;
        }
        tmp[ind++]=argv[1][i]-'0';
    }
    arr[pos++]=get_val(tmp,ind);
    if(pos==1){
        printf("Usage: please provide a list of at least two integers to sort in the format \"1, 2, 3, 4, 5\"\n");
        return 0;
    }


    quickSort(arr,0,pos-1);
    print(arr,pos);
}

Quick Sort in C was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 20 2019 11:38:09. The solution was first committed on Oct 20 2019 00:38:43. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.