C++ primer plus第六版课后编程练习答案：8.4

#define  _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include<cstring>

using namespace std;

struct stringy{
char* str;
int ct;
};

void set(stringy& s1, const char* c1);
void show(const stringy& s2, int n = 1);//函数重载
void show(const char* t, int n = 1);

int main()
{
stringy beany;
char testing[] = "Reality isn't what it used to be.";

set(beany, testing);
int n = strlen(testing);
char* p1 = new char[n + 1];
show(beany);
show(beany,2);
delete[]beany.str;//原书是没有delete的，但是我不知道怎么在被调用函数里加进去，只好在这里加了。
testing[0] = 'D';
testing[1] = 'u';
show(testing);
show(testing, 3);
show("Done!");

return 0;
}

void set(stringy& s1, const char* c1)
{
int n = strlen(c1);
s1.str = new char[n + 1];
strcpy(s1.str, c1);
s1.ct = n;
//delete[] s1.str;
}

void show(const stringy& s2, int n)
{
for (int i = 0; i < n; i++)
cout << s2.str << endl;
}

void show(const char* t, int n)
{
for (int i = 0; i < n; i++)
cout << t << endl;
}