"Thinkinginc++" 52, static variables inside the function

/*** book: "thinkinginc++" * function: Static variable inside function * Time: September 17, 2014 18:06:33* Author: cutter_point*/#include ". /require.h "#include <iostream>using namespace Std;char onechar (const char* chararray=0) {    const static char* s ;   Automatically initialized to 0, this const indicates that the pointer is pointing to a pointer of type char,    //cannot become another pointer type or becomes a non-pointer, the address can be changed, the type cannot be changed, and this initializes only once    if (Chararray)    {        S=chararray;    The address can be arbitrarily assigned, but *s cannot be changed, and only one        return *s is initialized;    }    else        require (S, "un-initialized S");    if (*s = = ') '        return 0;    return *s++;} char* a= "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; int main () {    Onechar (a);    char c;    while ((C=onechar ()) = 0)   //back S is static or point to that place        cout<<c<<endl;    return 0;}

"Thinkinginc++" 52, static variables inside the function