HackerRank C- Array Reversal

Given an array, of size n, reverse it.

Example: If array is arr=[1,2,3,4,5] , after reversing it, the array should be, arr=[5,4,3,2,1]

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

int main()
{
    int num, *arr,*rev_arr, i,j;
    scanf("%d", &num);
    arr = (int*) malloc(num * sizeof(int));
    rev_arr = (int*) malloc(num * sizeof(int));
    for(i = 0; i < num; i++) {
        scanf("%d", arr + i);
    }

    for(i = num-1,j=0; i>=0&&j<num; i--,j++){
      *(rev_arr+j)=*(arr+i);
    }
    for(int i=0;i<num;i++)
    {
        *(arr+i)=*(rev_arr+i);
        printf("%d ",*(arr+i));
    }
    return 0;
}