C++在堆上申請和釋放記憶體 - new & delete

// 動态申請記憶體， 指向一個未初始化的整型 int *pi = new int;

// pi指向一個整型值，初始化為0 int *pi = new int();

// value of i is 1024 int i(1024);

// pi指向1024 int *pi = new int(1024);

// value of  s is "99999" string s(5, '9');

// *ps is "999999" string *ps = new string(6, '9');

/*  隻有使用new申請的記憶體，才能用delete來釋放 */

int i = 100; int *pi = &i; double *pd = new double(100);

// error: pi 指向一個局部變量，沒有使用new來申請記憶體 delete pi;

// ok delete pd;