C program to delete particular index in an array

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

int main()
{
    int i,num;
    printf("Enter the size of the arrays  :");
    scanf("%d", &num);

    int arr1[num], arr2[num], arr3[num] ;

    printf("enter elements in the array1 : ");

    for(i=0; i<num ; i++)
    {
        scanf("%d", &arr1[i]);
    }

    int k;
    printf("enter the index to delete:" );
    scanf("%d", &k);

    for (i=k ; i<num-1 ; i++)
    {
        arr1[i]=arr1[i+1];
    }

    num=num-1 ;

    printf("Array after deleting the element : ");


    for(i=0; i<num; i++)
    {
        printf("%d\t", arr1[i]);
    }



    return 0;

}