Which is the correct syntax to declare constant pointer?

To declare a constant pointer in C or C++, you can use the following syntax:

type * const pointerName;

```

Here, `type` is the data type of the value that the pointer points to, and `pointerName` is the name of the pointer. The `const` keyword indicates that the pointer itself cannot be modified to point to a different address after it has been initialized. However, the value at the address pointed to can still be modified unless that value's type is also declared as `const`.

For example:

```c

int * const ptr = &someVariable;

In this example, `ptr` is a constant pointer to an integer.