In C, what is the result of declaring a pointer as int *ptr; without initialization?

When you declare a pointer in C like this: int *ptr; without initialization, the pointer ptr gets a garbage value, or more specifically, it points to some arbitrary memory location. This can lead to undefined behavior if you try to access or manipulate the memory location that ptr points to without properly initializing it first. It's generally a good practice to initialize a pointer to NULL if you don't have a suitable address to assign it at the time of declaration. This way, you can easily check whether the pointer has been properly initialized or not later in your code.