C++ Primer第九章课后编程问题

1、



代码：
头文件golf.h代码：

const int Len = 40;
struct golf
{
char fullname[Len];
int handicap;
};
void setgolf(golf & g, const char * name, int hc);
int setgolf(golf & g);
void handicap(golf & g, int hc);
void showgolf(const golf & g);

golf.cpp代码

#include<iostream>
#include<cstring>
#include "golf.h"
using namespace std;
void setgolf(golf & g, const char * name, int hc)
{
strcpy(g.fullname, name);
g.handicap = hc;
}
int setgolf(golf & g)
{
cout<< "请输入全名: ";
cin.getline(g.fullname, Len);
if (g.fullname[0] == '\0')
return 0;
cout << "Enter handicap value: ";
while (!(cin >> g.handicap))
{
cin.clear();
cout << "请输入整数:";
}
while (cin.get() != '\n')
continue;
return 1;
}
void handicap(golf & g, int hc)
{
g.handicap = hc;
}
void showgolf(const golf & g)
{
cout << "Golfer: " << g.fullname << "\n";
cout << "Handicap: " << g.handicap << "\n\n";
}
const int Mems = 5;
int main()
{
golf team[Mems];
cout << "输入 " << Mems << " 球队成员:\n";
int i;
for (i=0; i<Mems; i++)
if (setgolf(team[i]) == 0)
break;
for (int j=0; j<i; j++)
showgolf(team[j]);
setgolf(team[0], "Fred Norman", 5);
showgolf(team[0]);
handicap(team[0], 4);
showgolf(team[0]);
return 0;
}

执行结果：



2、改动程序清单9.8:用string对象取代字符数组.这样,该程序将不再须要检查输入的字符串是否过长,同一时候能够将输入字符串同字符串""进行比較,比推断是否为空行
代码：

#include<iostream>
#include<string>
using namespace std;
void strcount(const string &str);
int main()
{
string input;
cout << "Enter a line:\n";
getline(cin, input);
while ("" != input)
{
strcount(input);
cout << "Enter next line:";
getline(cin, input);
}
cout << "bey!\n";
}
void strcount(const string &str)
{
cout << "\"" << str << "\"： ";
int count = str.length();
cout << count << "  characters\n";
}

执行结果：



3、



代码：

#include<iostream>
#include<cstring>
struct chaff
{
char dross[20];
int slag;
};
int main()
{
using std::cout;
using std::endl;
chaff *p1;
int i;
p1 = new chaff[2];
std::strcpy(p1[0].dross, "Tiffany Zhao");
p1[0].slag=13;
std::strcpy(p1[1].dross, "guugle");
p1[1].slag=-23;
for(i=0; i<2; i++)
cout << p1[i].dross << ": " << p1[i].slag <<endl;
delete [] p1;
return 0;
}

执行结果：