单项选择题

有如下程序：
#include 〈iostream〉
using namespace std;
class Base
private:
char c;
public:
Base(char n) :c(n)
～Base ( )

cout〈〈c;

;
class Derived : public Base
private:
char c;
public:
Derived(char n) :Base(n+1),c(n)
～Derived ()

cout〈〈c;

;
int main ( )
Derived obj (’x’);
return 0;
执行上面的程序将输出( )。

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