Campus Nikalo: Explain Pointers to Pointers with example

Explain Pointers to Pointers with example

We introduced the concept of a pointer to a pointer previously. You can have a pointer to a pointer of any type.
Consider the following:
char ch; /* a character */
char *pch; /* a pointer to a character */
char **ppch; /* a pointer to a pointer to a character */
We can visualise this in following Figure. Here we can see that **ppch refers to memory address of *pch which refers to the memory address of the variable ch. But what does this mean in practice?
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Fig. Pointers to pointers Recall that char * refers to a (NULL terminated string. So one common and convenient notion is to declare a pointer to a pointer to a string as in following fig.

Fig. Pointer to String

Taking this one stage further we can have several strings being pointed to by the pointer as in following fig

Fig. Pointer to Several Strings We can refer to individual strings by ppch[0], ppch[1], ..... Thus this is identical to declaring char *ppch[].
One common occurrence of this type is in C command line argument input which we now consider.