【C++語法】關鍵字
阿新 • • 發佈:2021-08-09
https://tlanyan.pp.ua/cpp-function-modifier-summary/
#include <bits/stdc++.h> using namespace std; #define PI 3.14 typedef int myint int main(){ const int sz = get_size(); //const objects: must be initialized when created. Not a const expression constexpr int num = 315; //constant expression: value canbe evaluated at complie time int arr[num]; //array dimension (as part of the array's type) must be know at compile time /* array ** int a2[] = a1; //error: cannot initialize one array with another ** int *ptr[10]; //array of ten pointers to int ** int (*Ptr)[10] = &arr //point to an array of ten ints */ return 0; }
Static與Const的區別
C++ static、const 和 static const 型別成員變數宣告以及初始化
const
- const 成員變數也不能在類定義處初始化,只能通過建構函式初始化列表進行,並且必須有建構函式
static
from Chu
- outside the class, do not repeat the
static
keyword;static member functions
do not havethis
pointer, may not be declared asconst
;static data members
are not initialized by the constructors, they are usually defined and initialized outside the class body. (const integral type can be initialized inside the class body)static data members
can be the class, whereas nonstatic data members must be declared as pointers or references to the class;static data members
can be used as default argument