Program crashes in Dev C++ when I compile and run - c

Question

When I run this program in Dev C++, it executes until "enter the no of elements u want in an array" and when I give 5 numbers as input it crashes.
Can anyone help me out?
here is an implementation of quick sort using c
#include<stdio.h>
#include<stdlib.h>
void swap(int *a,int *b)//function to swap array
{
int temp;
temp=*a;
*a=*b;
*b=temp;
}
void quicksort(int arr[],int start,int end)//function for performig quicksort
{
if(start>=end)
{
return;
}
else
{
int pindex= partition(arr,start,end);
quicksort(arr,start,pindex-1);
quicksort(arr,pindex+1,end);
}
}
int partition(int arr[],int start,int end)//function to partition the array
{
int i;
int pivot=arr[end];//always making the last element in the array as pivot
int pindex=arr[start];
for(i=0;i<end;i++)
{
if(arr[i]<=pivot)
{
swap(&arr[i],&arr[pindex]);
}
swap(&arr[pindex],&arr[end]);
}
}
void display(int arr[],int n)//function to display the sorted array
{
int i=0;
for(i=0;i<n;i++)
{
printf("%d",arr[i]);
}
}
void main() // main function initializing here
{
int n,i,arr[20];
printf("enter the no of elements u want in an array");
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d",&arr[i]);
printf("\n");
}
quicksort(arr,0,n);
display(arr,n);
getch();
}
This is my complete code of quick sort program.i used different functions for different displaying output,swapping numbers partitioning etc.

Answer 1

the posted code does not even come close to compiling.
strongly suggest compiling with all warnings enabled
(for gcc at a minimum use: -Wall -Wextra -pedantic to enable warnings
Fix the warnings.
Then re-post the code
Just for your information:
use: int main( void ) or int main( int argc, char *argv[] )
place a prototype for each function, other than main(),
at the beginning of the file, just after the #include statements
the conio.h header file is not portable (so should not be used)
suggest using stdlib.h
any function that is not a void return type must have a
return value; statement
the function: getch() is not portable (so should not be used)
suggest using getchar()
in general, for code layout, use:
'#include' statements
blank line
'#define' statements
blank line
'static' file scope variables
blank line
prototypes for all functions except main()
blank line
'int main()' function
blank line
each sub function, separated by a blank line

Answer 2

given this code:
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d",&arr[i]);
printf("\n");
}
the user will see a prompt for the initial input, then only a blinking cursor.
A second prompt for the actual values, along with the directive to only enter one value per line would be good coding practice.
When calling scanf() (and family of functions) always check the returned value (not the parameter value) to assure the input operation was successful.
Suggest, in the existing prompt to the user, add the max value (20) and check in the code that the user entered value is less than 21.
Suggest, for the initial scanf() to change the format specifier to "%u" to assure the user cannot enter a negative value.
Suggest, checking the user did not enter 0 for the number of elements
Since the user will be entering values in any of several different ways, what if they entered:
5 1 2 3 4 5
The call to printf() in the middle of the input loop will result in 5 blank lines being inserted into the terminal. This would not be desirable.
Suggest removing the current printf() from the input loop