參考文獻與指針

Question

我認爲它是關於時間我學會了區別。我已經看到如何使用這些，但教程有點模糊。我對語法以及如何在很小程度上使用它們有非常基本的瞭解。指針總是顯得有點嚇人和混亂。我聽說，一旦你學會使用它們，它們是偉大的，我想要一些偉大的:)。那麼，我應該如何使用這些以及我應該在什麼時候使用它們？還有一件事，我正在使用C++。

謝謝！

Answer 1

即使我在這裏鳴叫鴨小樣本可能闡明同意：

int nValue = 5; 
/* 
* &rfValue is a reference type, and the & means reference to. 
* references must be given a value upon decleration. 
* (shortcut like behaviour) 
* it's better to use reference type when referencing a valriable, 
* since it always has to point to a valid object it can never 
* point to a null memory. 
*/ 
int &rfValue = nValue; 

/* This is wrong! reference must point to a value. it cannot be 
* null. 
*/ 
//int &rfOtherValue; /* wrong!*/ 

/* same effect as above. It's a const pointer, meaning pValue 
* cannot point to a different value after initialization. 
*/ 
int *const pValue = &nValue; //same as above 

rfValue++; //nValue and rfValue is 6 
nValue++; //nValue and rfValue is 7 
cout << rfValue << " & " << *pValue << " should be 7" << endl;