1
/*2014. 01. 14 by Arby*/
/*c++ primer 第八章编程练习*/
/*默认参数*/
#include <iostream>
using namespace std;
void ShowStr(const char *str, int n = 0);
int main()
{
/*初始化*/
int count = 0;
const int str_size = 10;
char str[str_size] = "xiaoke";
/*操作*/
cout << "enter the times you want to show: " << endl;
cin >> count;
while(count > 0)
{
ShowStr(str, count);
count--;
}
cin.get();
cin.get();
return 0;
}
void ShowStr(const char *str, int n)
{
cout << str << " ";
}
2.
/*2014. 01. 14 by Arby*/
/*c++ primer 第八章编程练习*/
/*结构的引用*/
#include <iostream>
#include <cstring>
using namespace std;
struct CandyBar
{
char *candy_bar_name;
double weight;
int hot;
};
const CandyBar &SetValue(CandyBar &sour, char *str, double weight_value, int hot_value);
int main()
{
/*初始化*/
char name[10] = "xiaoke";
double weight_value = 23.5;
int hot_value = 10;
CandyBar candy_bar;
/*操作*/
CandyBar candy = SetValue(candy_bar, name, weight_value, hot_value);
cout <<"the inform of the candy is: "<< endl;
cout << candy_bar.candy_bar_name <<" " << candy_bar.weight << " " << candy_bar.hot << &candy_bar << endl;
cout << candy.candy_bar_name << " " << candy.weight << " " << candy.hot << &candy << endl;
delete [] candy.candy_bar_name;
cin.get();
cin.get();
return 0;
}
/*结构的引用进行赋值，各个参量的赋值作用*/
const CandyBar &SetValue(CandyBar &sour, char *str, double weight_value, int hot_value)
{
int len = strlen(str);
int i = 0;
sour.candy_bar_name = new char[len+1];
for(i = 0; i < len; i++)
{
sour.candy_bar_name[i] = str[i];
}
sour.candy_bar_name[i] = '\0';
sour.weight = weight_value;
sour.hot = hot_value;
return sour;
}
3
/*2014. 01. 14 by Arby*/
/*c++ primer 第八章编程练习*/
/*string的引用*/
#include <iostream>
#include <string>
using namespace std;
string &ExchangeChar(string &str);
int main()
{
/*初始化*/
string str;
/*操作*/
cout << "Enter a string (q to quit): ";
getline(cin, str);
while(str != "q")
{
cout << ExchangeChar(str) << endl;
cout << "next string: ";
getline(cin, str);
}
cout << "bye";
cin.get();
cin.get();
return 0;
}
string &ExchangeChar(string &str)
{
int strlength = str.length();
char *ps = &str[0];
for(int i = 0; i <strlength; i++)
{
*ps = toupper(*ps);
ps++;
}
return str;
}
4.
/*2014. 01. 14 by Arby*/
/*c++ primer 第八章编程练习*/
/*const 使用*/
#include <iostream>
#include <cstring>
using namespace std;
struct stringy
{
char *str;
int ct;
};
void set(stringy &inform, char *str);
void show(const stringy &inform, int n = 1);
void show(const char *ch, int n = 1);
int main()
{
/*初始化*/
stringy beany;
char testing[] = "Reality isn't what it used to be.";
/*操作*/
set(beany, testing);
show(beany);
show(beany, 2);
testing[0] = 'D';
testing[1] = 'u';
show(testing);
show(testing, 3);
show("Done! ");
cin.get();
cin.get();
return 0;
}
void set(stringy &inform, char *str)
{
int len = strlen(str);
int i = 0;
inform.str = new char[len+1];
for(i = 0;i < len;i++)
{
inform.str[i] = str[i];
}
inform.str[i] = '\0';
inform.ct = i;
}
void show(const stringy &inform, int n)
{
for(int i = 0; i < n;i++)
{
cout << "For stringy " << i+1 << " : ";
cout << inform.str << " " << inform.ct << endl;
}
}
void show(const char *ch, int n)
{
for(int i = 0; i < n; i++)
{
cout << "For ch "<< i+1<< " : ";
cout << ch << endl;
}
}
5.
/*2014. 01. 14 by Arby*/
/*c++ primer 第八章编程练习*/
/*数组模板 使用 形式 Type max5(Type a[]) */
#include <iostream>
using namespace std;
template <typename Type>
Type max5(Type a[]);
int main()
{
/*初始化*/
int arr1[5] = {1, 3, 4, 5, 23};
int arr1_max = 0;
double arr2[5] = {323.34, 43.4, 32.44, 434.34, 334.4};
double arr2_max = 0;
/*操作*/
arr1_max = max5(arr1);
arr2_max = max5(arr2);
cout << "int array max is: " << arr1_max << endl;
cout << "double array max is: " << arr2_max << endl;
cin.get();
cin.get();
return 0;
}
template <typename Type>
Type max5(Type a[])
{
Type max = a[0];
for(int i = 0; i < 5; i++)
{
if(a[i] > max)
{
max = a[i];
}
}
return max;
}
8
/*2014. 01. 14 by Arby*/
/*c++ primer 第八章编程练习*/
/*模板及具体化，这里只能用早期的具体化来实现 */
#include <iostream>
#include <cstring>
using namespace std;
template <typename Type>
Type max6(Type a[], int n);
char *max6(char *arr[], int &size);
int main()
{
/*初始化*/
int arr1[6] = {1, 3, 4, 5, 23, 54};
int arr1_max = 0;
double arr2[5] = {323.34, 43.4, 32.44, 434.34, 334.4};
double arr2_max = 0;
char *arr[5] = {"xiaoke", "xiaohe", "xiaoyou", "xiaohua", "xiaojian"};
char *arr_length;
int size = 5;
/*操作*/
arr1_max = max6(arr1, 6);
arr2_max = max6(arr2, 5);
cout << "int array max is: " << arr1_max << endl;
cout << "double array max is: " << arr2_max << endl;
arr_length = max6(arr, size); /*这里是引用，必须要进行变量的传递，不能是直接赋值*/
cout <<"char maxlength is: " << arr_length <<endl;
cin.get();
cin.get();
return 0;
}
template <typename Type>
Type max6(Type a[], int n)
{
if(n == 0)
return -1;
Type max = a[0];
for(int i = 0; i < n; i++)
{
if(a[i] > max)
{
max = a[i];
}
}
return max;
}
/*具体化, 只能用早期的具体化*/
char *max6(char *arr[], int &size)
{
int count = 0;
int max_length = 0;
for(int i = 0; i < size; i++)
{
if(strlen(arr[i]) > max_length)
max_length = strlen(arr[i]);
count = i;
}
return arr[count];
}