Quicksort Program in c

#include<stdio.h>

void quick_sort(int arr_num[25],int first,int last){

int temp,i, j, pivot;

if(first<last){

pivot=first;

i=first;

j=last;

while(i<j){

while(arr_num[i]<=arr_num[pivot]&&i<last)

i++;

while(arr_num[j]>arr_num[pivot])

j--;

if(i<j){

temp=arr_num[i];

arr_num[i]=arr_num[j];

arr_num[j]=temp;

}

}

temp=arr_num[pivot];

arr_num[pivot]=arr_num[j];

arr_num[j]=temp;

quick_sort(arr_num,first,j-1);

quick_sort(arr_num,j+1,last);

}

}

int main(){

int i, size,arr_num[25];

printf("How many number of elements going to enter?: ");

scanf("%d",&size);

printf("Enter %d elements: ", size);

for(i=0;i<size;i++)

scanf("%d",&arr_num[i]);

quick_sort(arr_num,0,size-1);

printf("Sorted elements order are: ");

for(i=0;i<size;i++)

printf(" %d",arr_num[i]);

return0;

}