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C++: Pointers

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What is exactly a pointer in C?
What is the significance of a NULL pointer?

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Solution Summary

This solution explores the role of pointers in C, in the context of computer science.

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A pointer in C is a variable that holds an address as its value. Usually, when accessing a pointer variable's value you are more interested in the value at the address the variable holds rather than the address itself. For example, consider the following two variable declarations:

int x;
int* p;

The first creates a variable "x" that holds integer values. The second creates a variable "p" that holds ...

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