The difference between int* p=new int[N] and int* p=new int(N)

int *p = new int(N);

This statement allocates a section of memory, initializes an object of type int by value, and returns its pointer to the defined p. The initial value of int pointed to by p is 0.

 int *p = new int[N];

The meaning of this statement is: allocate a piece of memory and store N int objects continuously like an array, these ints are initialized by default. For the int type, its initial value is uncertain. Return the pointer of the first int to p.