1、
#include<iostream>
using namespace std;
int main()
{
char ch;
cout << "Enter text:\n";
while (cin.get(ch) && ch != '@')
{
if (isalpha(ch))
ch = tolower(ch);
if (isdigit(ch))
continue;
cout << ch;
}
}
2、
#include<iostream>
#include<array>
using namespace std;
const int Max = 10;
int main()
{
array<double, Max> donation;
int i = 0, count = 0;
double sum = 0;
cout << "Enter a series of double(number up to 10 and terminate with non-number):\n";
while ((cin >> donation[i]) and i < Max)
{
count++;
sum += donation[i];
i++;
}
cout << count << " number has been read.\n";
double ave;
cout << "The average is " << (ave = sum / count) << endl;
int largers = 0;
i = 0;
while (i++ < count)
{
if (donation[i] > ave)
largers++;
}
cout << largers <<" donations are larger than average.\n";
}
3、
#include<iostream>
#include<array>
using namespace std;
const int Max = 10;
int main()
{
cout << "Please enter one of the following choice:\n";
cout << "a)alpha\t\tc)carnivore\np)pianist\t\tt)tree\ng)game\n";
char ch;
while (cin.get(ch) && !('a' == ch || 'c' == ch || 'p' == ch || 't' == ch || 'g' == ch))
{
cout << "Please enter a, c, p, t or g: ";
}
cout << "A sample is a ";
switch (ch)
{
case 'a': cout << "alpha\n"; break;
case 'c': cout << "carnivore\n"; break;
case 'p': cout << "pianist\n"; break;
case 't': cout << "tree\n"; break;
case 'g': cout << "game\n"; break;
default: "error"; break;
}
}
4、
#include<iostream>
using namespace std;
const int strsize = 20;
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
};
void printInfo(bop*, int, bool, bool, bool, bool);
void printInfoCond(bop*, int);
int main()
{
bop members[5] =
{
{"Wimp Macho", "manager", "WM", 0},
{"Raki Rhodes", "programmer001", "RR", 0},
{"Celia Laiter", "programmer002", "CL", 0},
{"Hoppy Hipman", "programmer003", "HH", 0},
{"Pat Hand", "programmer004", "PH", 0}
};
cout << "Benevolent Order of Programmers Report\n";
cout << "a. display by name\t\tb. display by title\nc. display by bopname\t\td.diaplay by preference\nq.quit\n";
cout << "Enter your choice: ";
char choice;
while (!(cin >> choice) || (choice != 'a' && choice != 'b' && choice != 'c' && choice != 'd' && choice != 'q'))
{
cout << "Enter a valid choice with a, b, c, d or q: ";
}
bool isa, isb, isc, isq;
isa = isb = isc = isq = false;
switch (choice)
{
case 'a': isa = true; break;
case 'b': isb = true; break;
case 'c': isc = true; break;
case 'q': isq = true; break;
default: break;
}
printInfo(members, 5, isq, isa, isb, isc);
}
void printInfo(bop* members, int n, bool isq, bool isa, bool isb, bool isc)
{
if (isq)
{
cout << "Quit!\n";
return;
}
bop* member = members;
if (isa)
{
for (int i = 0; i < n; i++)
cout << member++->fullname << endl;
}
else if (isb)
{
for (int i = 0; i < n; i++)
cout << member++->title << endl;
}
else if (isc)
{
for (int i = 0; i < n; i++)
cout << member++->bopname << endl;
}
else
{
for (int i = 0; i < n; i++)
{
printInfoCond(member, member->preference);
member++;
}
}
}
void printInfoCond(bop* member, int pref)
{
switch (pref)
{
case 0: cout << member->fullname << endl; break;
case 1: cout << member->title << endl; break;
case 2: cout << member->bopname << endl; break;
default: cout << "Preference " << pref << " doesn't match any information!\n"; break;
}
}
5、
#include<iostream>
using namespace std;
double incomeTax(double);
int main()
{
double earning;
cout << "Enter the earning int tvarps: ";
while (cin >> earning && earning >= 0)
{
cout << "Tax is " << incomeTax(earning) << " for earning " << earning << " tvarps\n";
cout << "Enter the earning int tvarps: ";
}
}
double incomeTax(double income)
{
double tax;
if (income <= 5000)
tax = 0;
else if (income <= 15000)
tax = (income - 5000) * 0.1;
else if (income <= 35000)
tax = (income - 15000) * 0.15 + 10000 * 0.1;
else
tax = (income - 35000) * 0.2 + 20000 * 0.15 + 10000 * 0.1;
return tax;
}
6、
#include<iostream>
#include<string>
using namespace std;
const int StrSize = 20;
struct contri
{
char name[StrSize];
double fund;
};
int main()
{
int n;
cout << "Please enter the number of contributers: ";
(cin >> n).get();
contri* contributors = new contri[n];
for (int i = 0; i < n; i++)
{
cout << "\nContributor #" << i + 1 << endl;
cout << "Name: ";
cin.getline(contributors[i].name, StrSize);
cout << "fund: ";
(cin >> contributors[i].fund).get();
}
bool grandPatrons = false;
cout << "Grand Patrons:\n";
for (int i = 0; i < n; i++)
{
if (contributors[i].fund >= 10000)
{
grandPatrons = true;
cout << "Name: " << contributors[i].name << ", fund: $" << contributors[i].fund << endl;
}
}
if (!grandPatrons)
cout << "none\n";
//Other Patrons
bool otherPatrons = false;
cout << "Other Patrons:\n";
for (int i = 0; i < n; i++)
{
if (contributors[i].fund < 10000)
{
otherPatrons = true;
cout << "Name: " << contributors[i].name << ", fund: $" << contributors[i].fund << endl;
}
}
if (not otherPatrons)
cout << "none\n";
}
7、
#include<iostream>
using namespace std;
const int WordMaxLen = 20;
int main()
{
char word[WordMaxLen];
cout << "Enter words (q to quit):\n";
int vowel = 0, consonant = 0, other = 0;
while (cin >> word && strcmp(word, "q"))
{
if (isalpha(word[0]))
{
switch (word[0] = tolower(word[0]))
{
case 'a':
case 'e':
case 'i':
case 'o':
case 'u': vowel++; break;
default: consonant++; break;
}
}
else
other++;
}
cout << vowel << " words beginning with vowels\n";
cout << consonant << " words beginning with consonant\n";
cout << other << " others\n";
}
8、
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
ifstream fin;
string filename = "chapter6question8.txt";
fin.open(filename);
if (!fin.is_open())
{
cout << filename << " doesn't exits! Programming exiting unexpectedly.\n";
}
char ch;
int count = 0;
while ((fin.get(ch)).good())
{
cout << ch;
count++;
}
cout << count << " characters readed.\n";
}
9、
#include<iostream>
#include<string>
#include<fstream>
using namespace std;
const int StrSize = 40;
struct contri
{
char name[StrSize];
double fund;
};
int main()
{
ifstream fin;
char filename[StrSize] = "chapter6question9.txt";
fin.open(filename);
if (!fin.is_open())
{
cout << "File " << filename << " doesn't exists, program exiting unexpectedly!\n";
exit(EXIT_FAILURE);
}
int n;
(fin >> n).get();
contri* contributors = new contri[n];
cout << "Reading files:";
for (int i = 0; i < n; i++)
{
cout << "\nContributor #" << i + 1 << endl;
fin.getline(contributors[i].name, StrSize);
cout << "Name: " << contributors[i].name << endl;
(fin >> contributors[i].fund).get();
cout << "fund: " << contributors[i].fund << endl;
}
cout << "Reading over.\n";
// Grand Patrons
bool grandPatrons = false;
cout << "\nGrand Patrons:\n";
for (int i = 0; i < n; i++)
{
if (contributors[i].fund >= 10000)
{
grandPatrons = true;
cout << "Name: " << contributors[i].name << ", fund: $" << contributors[i].fund << endl;
}
}
if (!grandPatrons)
cout << "none\n";
// Other Patrons
bool otherPatrons = false;
cout << "\nOther Patrons:\n";
for (int i = 0; i < n; i++)
{
if (contributors[i].fund < 10000)
{
otherPatrons = true;
cout << "Name: " << contributors[i].name << ", fund: $" << contributors[i].fund << endl;
}
}
if (not otherPatrons)
cout << "none\n";
}
chapter6question9.txt
4 Sam Stone 2000 Freida Flass 100500 Tammy Tubs 5000 Rich Raptor 55000
注意最后一行有个回车。
标签：std,main,PrimerPlus,cout,int,C++,第六版,using,include From： https://www.cnblogs.com/xinmind/p/16887734.html