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    Let’s understand the concept of double pointers with the help of a diagram: As per the diagram, pr2 is a normal pointer that holds the address of an integer variable num. There is another pointer pr1 in the diagram that holds the address of another pointer pr2, the pointer pr1 here is a pointer-to-pointer (or double pointer).
    First a pointer is a variable, like any other variable, but that holds the address of a variable. A pointer to a pointer is a variable, like any other variable, but that holds the address of a variable. That variable just happens to be a pointer. When would you use them?
    pointers to pointers should not to be confused with arrays of rank2, eg int x where you write x you access the value in the array. This is only an example where a void** is appropriate. A pointer to pointer is only a pointer that points to, well, a pointer. How it works: It is a variable that can store another pointer.
    Output: A pointer-to-a-pointer is used when a reference to a pointer is required. For example, when you wish to modify the value (address pointed to) of a pointer variable declared in a calling function's scope inside a called function.
  5. Dansk Pointer Klub

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  7. How do pointer-to-pointers work in C? (and when might you use …

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  10. C - Pointer to Pointer (Double Pointer) with example

    WebWhen a pointer holds the address of another pointer then such type of pointer is known as pointer-to-pointer or double pointer. In this guide, we will learn what is a double pointer, how to declare them and how to use …

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