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What is a pointer on a pointer in C programming language?

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What is a pointer on a pointer in C programming language?

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A pointer variable that contains the address of another pointer variable is called pointer on a pointer. This concept de-refers twice to point to the data held by a pointer variable.

int a = 5; *x=&a, **y=&x;

In this example **y returns the value of the variable a.

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