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A pointer can point to address of another pointer. consider the example
int x=456, *p1, **p2;p1 = &x;p2 = &p1;
Copyright Einstein College of EngineeringDepartment of Civil Engineering
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printf("%d", *p1); will display value of x 456.printf("%d", *p2); will also display value of x 456. This is because p2 point p1, and p1 points x.Therefore p2 reads the value of x through pointer p1. Since one pointer is points towards anotherpointer it is called chain pointer. Chain pointer must be declared with ** as in **p2
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