[考題] 100普考 計概
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
出處:如題
下列以C++程式語言撰寫之程式執行後的輸出為何？
#include <iostream>
using namespace std;
class P {
public:
void foo() { cout << 'P'; }
};
class C : public P {
public:
void foo() { cout << 'C'; }
};
int main()
{
P p; C c;
P *pc = &c;
P &rc = c;
p.foo();
c.foo();
pc->foo();
rc.foo();
return 0;
}
(A)PCPP (B)PPPP (C)PCCC (D)CCCC
答案是A
可是請問為什麼c.foo()是印出C ?而不是呼叫父類別P的foo() ?
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