What will happen if C++ Pointer variable is increment?

Question

If i increment an int type of pointer variable then what will increment? The value that it point to? Or the memory size? Answr Please!

Example :

int a=5;
int *ptr;
ptr=&a;
ptr++;
cout<<*ptr;

What will be the value of " *ptr " and How ????

Answer 1

just next memory

and then cout <<*ptr;
will print garbage value out
since the next address of ptr isn't assigned yet