在下面程序的下划线处填上正确的数据类型，保证程序具有如下输出结果：01717，17，17源程序如下：#include < iostream >using namespace std;class base{public : ______________num; base ( ) { } }; int base::hum = 0; void main( ) { cout << base::num << endl; _________________* p=&base : :num; *p=17; cout << base::num << end1; base a,b; cout << * p<<"," << a. hum << "," <