c++

rotating array to right side is working, but rotating to left side is not working with some numbers

how do i fix this with using below code

#include

using namespace std;

void rotate(int a[], int n, int k)

{

int i, b[n];

int np=-1;

if(k>=0)

{

for(i=0; i

{

b[(i+n+k)%n]=a[i];

}

}

else

{

for(i=0; i

{

b[(i+n+k)%n]=a[i];

}

}

for(i=0; i

{

cout<

}

}

int main()

{

int a[8]={0,1,2,3,4,5,6,7};

rotate(a, 8 ,-64);

return 0;

}