C program to print second largest and second smallest value in

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

int main()
{
    int i,a,j, counter;

    printf("Enter the size of array: ");
    scanf("%d",&a);

    int arr[a];
    for (i=0; i<a; i++)
    {
        scanf("%d",&arr[i]);
    }
    for( i=0; i<a; i++)
    {
        for(j=i+1; j<a; j++)
        {
            if (arr[i]>arr[j])
            {
                counter=arr[i];
                arr[j]=counter;
                arr[i]=arr[j];
            }
        }
    }

    printf("The second largest value is : %d\n",arr[a-2]);

    printf("The second smallest value is : %d\n", arr[1]);

    return 0;

}