【第六章】C++ Primer plus 的编程练习题(选取部分)

/***********************************
2017年10月16日13:41:12
Athor：xiyuan255
Course：C++
Contain：review6.cpp
Reference: C++ Primer plus
说明：C++ Primer plus第六章的练习题(选取部分)
【 P200 】
*************************************/
// review6.cpp -- C++ Primer plus 第六章练习题

#include <iostream>

#include <string>  // exsampleNo2 field
#include <array>   // exsampleNo2 field

#include <fstream> // exsampleNo8/exsampleNo9 field  file I/O
#include <cstdlib> // exsampleNo8/exsampleNo9 field  EXIL_FAILURE

using namespace std;

void exampleNo1(void);
void exampleNo2(void);
void exampleNo3(void);
void exampleNo4(void);
void exampleNo5(void);
void exampleNo6(void);
void exampleNo7(void);
void exampleNo8(void);
void exampleNo9(void);

int main(void)
{
//exampleNo1();   // example 1 test
//exampleNo2();   // example 2 test
//exampleNo3();   // example 3 test
//exampleNo4();   // example 4 test
//exampleNo5();   // example 5 test
//exampleNo6();   // example 6 test
//exampleNo7();   // example 7 test
//exampleNo8();   // example 8 test
exampleNo9();   // example 9 test

return 0;
}

void exampleNo1(void)
{
cout << "请输入数据信息： \n";
char ch;
while (cin.get(ch) && ch != '@') {
if (islower(ch)) {
cout << (char)((ch-'a') + 'A');
} else if (isupper(ch)) {
cout << (char)((ch-'A') + 'a');
}
if (ch == '\n')
cout << endl;
}
cout << "\nDone.\n";
}
/**
输出结果：
[[ vjhvjsJSHDvjd237647JDFKJjdfk ]]
VJHVJSjshdVJDjdfkjJDFK
[[ vsdghdhv273HGJSDGJ@vdnvf8487DFHJ ]]
VSDGHDHVhgjsdgj
Done.
*/

void exampleNo2(void)
{
const int ArSize = 10;
array<double, ArSize> donstion_array;
cout << "请输入最多10个数的值(用回车键区分)：\n";
int input_count = 0;
double donstion;
while (cin >> donstion) {
donstion_array[input_count++] = donstion;
}
int i;
double sum = 0.0;
for (i = 0; i < input_count; i++) {
sum += donstion_array[i];
}
double average = sum / input_count;
int count = 0;
for (i = 0; i < input_count; i++) {
if (donstion_array[i] > average)
count++;
}
cout << "这" << input_count << "个数的平均值是："
<< average << ", 有" << count << "个数超过平均值。\n";
}
/**
输出结果：
请输入最多10个数的值(用回车键区分)：
12.5
32.4
23.5
26.4
32.5
5.6
8.952
ds
这7个数的平均值是：20.2646, 有4个数超过平均值。
*/

void exampleNo3(void)
{
cout << "Please enter one of the following choices: \n"
<< "c) carnivore          p) pianist\n"
<< "t) tree               g) game\n";
char ch;
cin.get(ch);
while (cin.get(ch)) {
switch (ch) {
case 'c': cout << "A tiger.\n";
break;
case 'p': cout << "Beethoven is a pianist.\n";
break;
case 't': cout << "A maple is tree.\n";
break;
case 'g': cout << "The league of heroes is game.\n";
break;
default:
if ('\n' == ch)
cout << "Please enter a c, p, t, or g:";
break;
}
if ('a' == ch || 'c' == ch || 'p' == ch || 't' == ch || 'g' == ch)
break;
}
}
/**
输出结果：
Please enter one of the following choices:
c) carnivore          p) pianist
t) tree               g) game
f
Please enter a c, p, t, or g:q
Please enter a c, p, t, or g:t
A maple is tree.
*/

void exampleNo4(void)
{
const int strsize = 20;
const int SIZE = 5;
// Benevolent Order of Programers name structure
struct bop {
char fullname[strsize];  // real name
char title[strsize];     // job title
char bopname[strsize];   // secret BOP name
int preference;          // 0 = fullname, 1 = title, 2 = bopname
};
bop member[SIZE] = {
{"Wimp Macho", "C Programmer", "WMCP", 0},
{"Raki Rhodes", "Junior Programmer", "RRJP", 1},
{"Celia Laiter", "JAVA Programmer", "MIPS", 2},
{"Hoppy Hipman", "Analyst Trainee", "HHAT", 1},
{"Pat Hand", "C++ Programmer", "LOOPY", 2},
};
cout << "Please enter one of the following choices:\n"
<< "a. display by name     b. display by title\n"
<< "c. display by bopname  d. display by preference\n"
<< "q. quit \n";
char choice;
cout << "Enter your choice:";
while (cin.get(choice) && choice != 'q') {
for (int i = 0; i < SIZE; i++) {
if ('a' == choice) {
cout << member[i].fullname << endl;
} else if ('b' == choice) {
cout << member[i].title << endl;
} else if ('c' == choice) {
cout << member[i].bopname << endl;
} else if ('d' == choice) {
if (member[i].preference == 0) {
cout << member[i].fullname << endl;
} else if (member[i].preference == 1) {
cout << member[i].title << endl;
} else if (member[i].preference == 2) {
cout << member[i].bopname << endl;
}
}
}
if ('\n' == choice)
cout << "Next choice:";
}
cout << "Bye!\n";
}
/**
输出结果：
Please enter one of the following choices:
a. display by name     b. display by title
c. display by bopname  d. display by preference
q. quit
Enter your choice:a
Wimp Macho
Raki Rhodes
Celia Laiter
Hoppy Hipman
Pat Hand
Next choice:d
Wimp Macho
Junior Programmer
MIPS
Analyst Trainee
LOOPY
Next choice:q
Bye!
*/

void exampleNo5(void)
{
cout << "请输入你的收入：";
int income;
double sum_income;
while (cin >> income && income > 0) {
sum_income = 0.0;
if (income > 35000) {
sum_income += (income - 35000)*0.20;
income = 35000;
}
if (income > 15000) {
sum_income += (income - 15000)*0.15;
income = 15000;
}
if (income > 5000) {
sum_income += (income - 5000)*0.10;
income = 5000;
}
cout << "你的所得税为：" << sum_income << " tvarps.\n";
cout << "请输入你的收入：";
}
if (cin.fail())
cout << "输入类型不匹配！\n";

}
/**
输出结果：
请输入你的收入：38000
你的所得税为：4600 tvarps.
请输入你的收入：f
输入类型不匹配！
*/

void exampleNo6(void)
{
struct donor_msg {
string name;
double money;
};
cout << "Enter Donor Number: ";
int Number;
cin >> Number;
cin.get();
donor_msg* donor = new donor_msg[Number];
for (int i = 0; i < Number; i++) {
cout << "Enter the #" << i+1 << " donor name: ";
getline(cin, donor[i].name);
if (!donor[i].name.size())
donor[i].name = "none";
cout << "donor money: ";
cin >> donor[i].money;
cin.get();
}
cout << "\r- Grand Patrons -\n";
for (int i = 0; i < Number; i++) {
if (donor[i].money > 10000) {
cout << "Patrons: " << donor[i].name
<< ", Money: " << donor[i].money << endl;
}
}
cout << "\r- Patrons -\n";
for (int i = 0; i < Number; i++) {
cout << "Patrons: " << donor[i].name
<< ", Money: " << donor[i].money << endl;
}
}
/**
输出结果：
Enter Donor Number: 5
Enter the #1 donor name:
donor money: 12000
Enter the #2 donor name: zhangsan
donor money: 12036
Enter the #3 donor name: lishi
donor money: 9888
Enter the #4 donor name:
donor money: 12456
Enter the #5 donor name: wangwu
donor money: 12000
- Grand Patrons -
Patrons: none, Money: 12000
Patrons: zhangsan, Money: 12036
Patrons: none, Money: 12456
Patrons: wangwu, Money: 12000
- Patrons -
Patrons: none, Money: 12000
Patrons: zhangsan, Money: 12036
Patrons: lishi, Money: 9888
Patrons: none, Money: 12456
Patrons: wangwu, Money: 12000
*/

int IsVowel(char ch)
{
int isLowercaseVowel, isUppercaseVowel;
isLowercaseVowel = ('a' == ch || 'e' == ch || 'i' == ch || 'o' == ch || 'u' == ch);
isUppercaseVowel = ('A' == ch || 'E' == ch || 'I' == ch || 'O' == ch || 'U' == ch);
if (isLowercaseVowel || isUppercaseVowel)
return 1;  // 为元音字母
else
return 0;  // 为辅音字母
}

void exampleNo7(void)
{
cout << "Enter words (q to quit):\n";
int vpwels = 0, consonants= 0, others = 0;

// 方法一：
#if 0
string str = NULL;
while (cin >> str && str != "q") {
//cout << "str: " << str << endl;
if (isalpha(str[0])) {
if (IsVowel(str[0])) {
vpwels++;
}else {
consonants++;
}
} else {
others++;
}
}
#endif
// 方法二：
char ch[20] = {0, };
while (cin >> ch && strcmp(ch, "q")) {
//cout << "ch: " << ch << endl;
if (isalpha(ch[0])) {
if (IsVowel(ch[0])) {
vpwels++;
}else {
consonants++;
}
} else {
others++;
}
}
cout << vpwels << " words beginning with vowels\n"
<< consonants << " words beginning with consonants\n"
<< others << " others\n";

}
/**
输出结果：
Enter words (q to quit):
The 12 awesome oxen ambled
quietly across 15 meters of lawn. q
5 words beginning with vowels
4 words beginning with consonants
2 others
*/

void exampleNo8(void)
{
char filename[20];
cout << "Please enter filename for open: ";
cin >> filename;
ifstream inFile;
inFile.open(filename);

if (!inFile.is_open()) {
cout << "The file open error "
<< "Programming terminating.\n";
exit(EXIT_FAILURE);
}
char value;
int count = 0;
while (inFile >> value) {
//cout << value;
count++;
}
if (inFile.eof())
cout << "End of file reached.\n";
else if (inFile.fail())
cout << "Input terminated by data mismach.\n";
else
cout << "Input terminated for unknown reasom.\n";

if (0 == count)
cout << "No data processed.\n";
else
cout << "Input the " << count << " characters.\n";

inFile.close();
}
/**
输出结果：
Please enter filename for open: testdata.txt
End of file reached.
Input the 70 characters.
*/

void exampleNo9(void)
{
struct donor_msg {
string name;
double money;
};
//cout << "Enter Donor Number: ";
ifstream inFile;
inFile.open("donor.txt");
if (!inFile.is_open()) {
cout << "The file open error "
<< "Programming terminating.\n";
exit(EXIT_FAILURE);
}

int Number;
inFile >> Number;
inFile.get();
donor_msg* donor = new donor_msg[Number];
for (int i = 0; i < Number; i++) {
getline(inFile, donor[i].name);
if (!donor[i].name.size())
donor[i].name = "none";
cout << "Enter the #" << i+1 &
ac27
lt;< " donor name: "
<< donor[i].name << endl;
inFile >> donor[i].money;
cout << "donor money: " << donor[i].money << endl;
inFile.get();
}
cout << "\r- Grand Patrons -\n";
for (int i = 0; i < Number; i++) {
if (donor[i].money > 10000) {
cout << "Patrons: " << donor[i].name
<< ", Money: " << donor[i].money << endl;
}
}
cout << "\r- Patrons -\n";
for (int i = 0; i < Number; i++) {
cout << "Patrons: " << donor[i].name
<< ", Money: " << donor[i].money << endl;
}
}
/**
输出结果：
Enter the #1 donor name: Sam Stone
donor money: 2000
Enter the #2 donor name: Freida Flass
donor money: 100500
Enter the #3 donor name: Tammy Tubbs
donor money: 5000
Enter the #4 donor name: Rich Raptor
donor money: 50000
- Grand Patrons -
Patrons: Freida Flass, Money: 100500
Patrons: Rich Raptor, Money: 50000
- Patrons -
Patrons: Sam Stone, Money: 2000
Patrons: Freida Flass, Money: 100500
Patrons: Tammy Tubbs, Money: 5000
Patrons: Rich Raptor, Money: 50000
*/

// donor.txt
4
Sam Stone
2000
Freida Flass
100500
Tammy Tubbs
5000
Rich Raptor
50000

// testdata.txt
This is test data feil:
A, B, C, D, E, F, G, H, I, J, K, L, M, N,
O, P, Q, R, S, T, U, V, W, X, Y, Z