C expert programming note 4

Chapter 4 shocking fact: arrays and pointers are different
Many C-language books are vague about the time when arrays and pointers are the same and when they are different. The topic that should be elaborated on here is just a few things;

A declaration is equivalent to a general declaration: it describes the object created elsewhere rather than itself;

Definition is equivalent to a special declaration: it allocates memory for the object;

X = y;

In this context, the meaning of symbol x is the address represented by x, and the meaning of symbol y is the content of the address represented by y;

The array name must be left but not left;

[Cpp]
# Include <stdio. h>
Int main ()
{
Char * p = "012345 ";
Char a [19] = "01234 ";
// Float * pi = 3.14;
Printf ("% c", p [1]);
// P [1] = ch;
Printf ("% c", a [1]);
A [1] = 'a ';
Printf ("% c", a [1]);

Return 0;
};

Code verification: 1. Only a String constant can be initialized in the definition; 2. a String constant with char * is defined as read-only; 3. a String constant defined with char a [] can be modified;

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