Pointers and Constants

以下內容摘自The C++ Programming Language

void f1(char *p){
  char s[] = "Gorm";

  const char *pc = s;
  pc[3] = 'g';    // error: pc points to constant
    pc = p;         // ok

  char *const cp = s;
  cp[3] = 'a';    // ok
    cp = p;         // error: cp is constant

  const char *const cpc = s;
  cpc[3] = 'a';   // error: cpc points to constant
    cpc = p;        // error: cpc is constant
}

char *const cp;  //const pointer to char
char const* pc;  //pointer to const char
const char* pc2; //pointer to const char

to read each such declarations right-to-left. ex: "cp is a const pointer
to a char" and "pc2 is a pointer to a char const".

void f4(){
  int a = 1;
  const int c = 2;
  const int *pl = &c; // ok

    const int *p2 = &a; // ok
    int *p3 = &c;   // error: initialization of int* with const int*
    *p3 = 7;
}