填空题
设文件temp.txt 已存在,则以下的打印结果是 【15】
#include <iostream>
#include <fstream>
using namespace std;
int main()
ofstream outf ("temp.txt",ios base: :trunC) ;
outf<<"How you doing";
outf.close();
ifstream inf("temp.txt");
char str[20];
inf>>str;
inf.close();
cout<<str;
return 0;
【参考答案】
How
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有以下程序: #include <iostream> using namespace std; class Base private: int a,b; public: Base(int x, int y) a=x; b=y; void Show() cout<<a<< ’,’ <<b<<end1; ; class Derived : public Base private: int c; public: Derived(int x, int y, int z) : Base(x,y),c(z) void Show() cout<<c<<end1; ; int main() Base b(50,50),*pb; Derived d(10,20,30); pb=&d; pb->Show(); return 0; 运行后的打印结果为 【14】