/*2014,01.10 Arby*/
/*编程练习6.11*/
/*输入字符串，并检测到@进行结束操作*/
#include <iostream>
using namespace std;
int main()
{
/*初始化*/
char key_input[50];
int i = 0;
/*操作*/
cout << "please enter words: "<< endl;
cin.getline(key_input, 50);
int length = strlen(key_input);
while(i < length && key_input[i] != '@')
{
cout << key_input[i];
i++;
}
cin.get();
cin.get();
return 0;
}
2.
/*2014,01.10 Arby*/
/*编程练习6.11*/
/*读取数字的循环，遇到错误输入情况的解决之道*/
#include <iostream>
using namespace std;
int main()
{
/*初始化*/
const int double_size = 10;
double donations[double_size];
int i = 0;
double donations_sum = 0, donations_average = 0;
int count = 0;
/*操作*/
cout << "enter the " << i+1 << " number: ";
while((i < double_size) && (cin >> donations[i]))
{
donations_sum = donations_sum + donations[i];
i++;
cout << "enter the " << i+1 << "number: ";
}
while(!(cin >> donations[i])) /*删除错误输入*/
{
cin.clear();
while(cin.get() != '\n')
continue;
break;
}
/*必须全部输入10个数时，有错误时应该进行修改才可以*/
/*
1. 重置cin以接受新的输入
2.删除错误输入
3.提示用户再输入
*/
/* for(i = 0; i < double_size; i++)
{
cout << "enter the " << i+1 << " number: ";
while(!(cin >> donations[i]))
{
cin.clear();
while(cin.get() != '\n') */ /*这里是作为错误提醒用的还是输入的是10个数字*/
/* continue;
cout << "please enter a number: ";
}
}
*/
donations_average = donations_sum / i;
while((--i) >= 0)
{
if(donations[i] > donations_average)
count ++;
}
/*输出*/
cout << "the average is:" << donations_average << endl;
cout <<"And the count which bigger the average numbers is: " << count << endl;
cin.get();
cin.get();
return 0;
}
3.
/*2014,01.10 Arby*/
/*编程练习6.11*/
/*switch 语句的使用 */
#include <iostream>
using namespace std;
int main()
{
/*初始化*/
char ch_enter;
/*操作*/
cout << "please enter one of the following choices: " <<endl;
cout << "c) carnivore p)pianist" <<endl;
cout << "t) tree g)game" << endl;
cin>>ch_enter;
while(ch_enter != 'c' && ch_enter != 'p' && ch_enter != 't' && ch_enter != 'g')
{
cout << "please enter a c, p, t, or g:";
cin >> ch_enter;
}
switch(ch_enter)
{
case 'c' :
cout << "a maple is a carnivore" <<endl;
break;
case 'p' :
cout << "a maple is a pianist" <<endl;
break;
case 't' :
cout << "a maple is a tree" <<endl;
break;
case 'g' :
cout << "a maple is a game" <<endl;
break;
default: ;
}
cin.get();
cin.get();
return 0;
}
4.
/*2014,01.10 Arby*/
/*编程练习6.11*/
/*switch 语句的使用, 结构的使用 */
#include <iostream>
using namespace std;
const int strsize = 20;
struct bop
{
char fullname[strsize];
char title[strsize];
char bopname[strsize];
int preference; //0 = fullname, 1 = title, 2 = bopname
};
void display_preference(bop mem, int pre);
int main()
{
/*初始化*/
const int structsize = 3;
bop member_infor[structsize] = {
{"xiaohe", "hexiao", "hehe", 0},
{"xiaoke", "kexiao", "keke", 1},
{"xiaoyou", "youxiao", "youyou", 2}
};
char ch;
int i = 0;
/*操作*/
cout << "Benevolent order of programmers report" << endl;
cout << "a. display by name b.display by title" << endl;
cout << "c. display by bopname d.display by preference" << endl;
cout << "q.quit" <<endl;
cout << "enter your choice:";
cin >> ch;
while(ch != 'q')
{
switch(ch)
{
case 'a':
for(i = 0; i < structsize; i++)
{
cout << member_infor[i].fullname << endl;
}
break;
case 'b':
for(i = 0; i < structsize; i++)
{
cout << member_infor[i].title << endl;
}
break;
case 'c':
for(i = 0; i < structsize; i++)
{
cout << member_infor[i].bopname << endl;
}
break;
case 'd':
for(i = 0; i < structsize; i++)
{
display_preference(member_infor[i], member_infor[i].preference);
}
break;
default:
;
}
cout << "next choice: ";
cin>>ch;
}
cout << "Bye!" << endl;
cin.get();
cin.get();
return 0;
}
void display_preference(bop mem, int pre)
{
switch(pre)
{
case 0:
cout << mem.fullname << endl;
break;
case 1:
cout << mem.title << endl;
break;
case 2:
cout << mem.bopname << endl;
break;
default:
;
}
}
6.
/*2014,01.10 Arby*/
/*编程练习6.11*/
/*结构，if else */
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
struct donate
{
string strname;
double money;
};
int main()
{
/*初始化*/
int number = 0;
int i = 0;
int count = 0;
/*操作*/
cout << "please enter the number of the donators: ";
cin >> number;
cin.get(); //输入数字和字符串要注意的
donate *member = new donate[number];
for(i = 0; i < number; i++)
{
cout << "please enter the name:";
getline(cin, member[i].strname);
cout << "please enter the money:";
cin >> member[i].money;
cin.get();
if(member[i].money > 1000)
count++;
}
if(count == 0)
cout<< "none" << endl;
else if(count > 0)
{
cout << "grand patrons is a important donator." << endl;
for(i = 0; i< number; i++)
if(member[i].money > 1000)
cout << member[i].strname << " " << member[i].money << endl;
}
if(count == number)
{
cout << "none" <<endl;
}
else
{
cout << "patrons" << endl;
for(i = 0; i< number; i++)
if(member[i].money <= 1000)
cout << member[i].strname << " " <<setw(6)<< member[i].money << endl;
}
cin.get();
cin.get();
return 0;
}
7.
/*2014,01.10 Arby*/
/*编程练习6.11*/
/*结构，if else */
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
/*初始化*/
const int char_size = 20;
char words[char_size];
int yuan_count = 0, fu_count = 0, other_count = 0;
/*操作*/
cout << "enter words" << endl;
cin>>words;
while(strcmp(words ,"q"))
{
if(isalpha(words[0]))
{
if(words[0] == 'a' || words[0] == 'e' || words[0] == 'i' || words[0] == 'o' || words[0] == 'u')
yuan_count++;
else
fu_count++;
}
else
other_count++;
cin>>words;
}
/*输出*/
cout << yuan_count << "words beginning with vowels" <<endl;
cout << fu_count << "words beginning with consonants" << endl;
cout << other_count << "others" <<endl;
cin.get();
cin.get();
return 0;
}
9.
/*2014,01.10 Arby*/
/*编程练习6.11*/
/*文件中信息读取，这里其实可以检测\n来进行检验的 */
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;
struct donate
{
string strname;
double money;
};
int main()
{
/*初始化*/
ifstream in_file;
int number = 0;
int i =0;
int count = 0;
/*操作*/
in_file.open("file.txt");
if(!in_file.is_open())
{
cout << "could not open the file" << endl;
cout << "promming terminating" << endl;
exit(EXIT_FAILURE);
}
in_file >> number;
in_file.get();
donate *member = new donate[number];
for(i = 0; i < number; i++)
{
getline(in_file, member[i].strname);
in_file>>member[i].money;
in_file.get();
if(member[i].money > 1000)
count++;
}
/*输出*/
if(count == 0)
cout<< "none" << endl;
else if(count > 0)
{
cout << "grand patrons is a important donator." << endl;
for(i = 0; i< number; i++)
if(member[i].money > 1000)
cout << member[i].strname << " " << member[i].money << endl;
}
if(count == number)
{
cout << "none" <<endl;
}
else
{
cout << "patrons" << endl;
for(i = 0; i< number; i++)
if(member[i].money <= 1000)
cout << member[i].strname << " " << member[i].money << endl;
}
cin.get();
cin.get();
return 0;
}