#include <iostream>
using namespace std;
int main()
{
int f, f1 = 0, f2 = 1;
for (int i = 3; i <= 6; i++)
{
f = f1 + f2;
f1 = f2; f2 = f;
}
cout << f << endl;
return 0;
}

运行时的输出结果是______。

①cout << 'A'<<setfill('*') << left << setw(7) << 'B' << endl;
②cout << setfill('*') << left << setw(7) << 'A' << 'B' << endl;
③cout << 'A' << setfill('*') << right << setw(7) << 'B' << endl;
④cout << setfill('*') << right << setw(7) << 'A' << 'B' << endl;

其中能显示A∗∗∗∗∗∗B的是______。

题目内容：

#include<iostream>
using namespace std;
class basel
{
public:
basel(int d) { cout << d; }
~basel() {}
};
class base2
{
public:
base2(int d) { cout << d; }
~base2() {}
};
class derived : public basel, base2
{
public:
derived(int a, int b, int c, int d) :basel(b), base2(a), b1(d), b2(c) {}
private:
int b1;
int b2;
};
int main()
{
derived d(1, 2, 3, 4);
return 0;
}

执行这个程序的输出结果是______。

题目内容：

#include <iostream>
using namespace std;
int main() {
int a = 10, b = 20, c = 30;
if (a > b)
c = a;
a = b;
b = c;
cout << "a = " << a << ", b = " << b << endl;
return 0;
}

#include <iostream>
using namespace std;
int main() {
int i = 0, sum = 0;
while (i < 5) {
sum += i;
i++;
}
cout << sum << endl;
return 0;
}