Answer:
int widthOfBox; //declaration
int widthOfBook; // declaration
if (widthOfBox%widthOfBook!=0){
}
Explanation:
This expression will evaluate to true if the value of widthOfBox is not divisible by widthOfBook.
The modulo operator (%) is used for this evaluation since widthOfBox %widthOfBook will evaluate to zero if the widthOfBox is divisible by widthOfBook