Rotating array anti-clockwise, unexpected debug output in one step

I'm using the simplest approach to rotate array anti-clockwise i.e by storing elements from index=0 to index=number of rotating positions required, in a temporary array and finally inserting these elements int he end of another array. Here's the code:

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int *a, *temp, i, j=0, n,np,*b;
    printf("Enter no. of elements in arr:\n");
    scanf("%d",&n);
    a=(int*) malloc(n*sizeof(int));//Primary array
    b=(int*) malloc(n*sizeof(int));//Final array that would be printed in the end
    printf("Enter elements:\n");
    for(i=0;i<n;i++)
        scanf("%d",&a[i]);
    printf("Enter positions to be rotated anti-clockwise:\n");
    scanf("%d",&np);
    temp=(int*) malloc(np*sizeof(int));//storing elements left of index=0
    for(i=0;i<np;i++,j++)
    {
        //printf("hi\n");
        temp[j]=a[i];
        printf("temp[%d]=%d\n",j,temp[j]);
    }
    j=0;
    printf("After rotating:\n");
    for(i=n-1;i>=0;i--)
    {
        printf("i=%d ",i);
        b[i-np]=a[i];
        printf("b[%d]=%d\n",i-np,b[i]); /*Here is 1 unexpected thing happening, the program is not picking up correct value of array a at index i.*/
    }
    for(i=np-1;i<n;i++,j++)
        b[i]=temp[j];//storing temp elements in final array

    printf("Finally matrix is\n");

    for(i=0;i<n;i++)
        printf("%d\n",b[i]);

    getch();
    return 0;
}