引用就是引用位址,給變量取個小名,這個都可以改變變量的數值。
代碼:
#include <iostream>
using namespace std;
int main ()
{
// 聲明簡單的變量
int i;
double d;
// 聲明引用變量
int& r = i;
double& s = d;
i = 5;
cout << "Value of i : " << i << endl;
cout << "Value of i reference : " << r << endl;
d = 11.7;
cout << "Value of d : " << d << endl;
cout << "Value of d reference : " << s << endl;
return 0;
}
結果::
Value of i : 5
Value of i reference : 5
Value of d : 11.7
Value of d reference : 11.7
指針也是一種存儲,隻不過存的是位址,用*取取出位址所對應的數值:
上代碼:
#include <iostream>
using namespace std;
int main ()
{
int var = 20; // 實際變量的聲明
int *ip; // 指針變量的聲明
ip = &var; // 在指針變量中存儲 var 的位址
cout << "Value of var variable: ";
cout << var << endl;
// 輸出在指針變量中存儲的位址
cout << "Address stored in ip variable: ";
cout << ip << endl;
// 通路指針中位址的值
cout << "Value of *ip variable: ";
cout << *ip << endl;
return 0;
}
代碼結果:
Value of var variable: 20
Address stored in ip variable: 0x7fff5bfda1d8
Value of *ip variable: 20