C++ Primer Plus

#include <iostream>    // 预处理器编译指令#include

int main() {
    using namespace std;

    cout << "Come up and C++ me some time";
    cout << endl;
    cout << "You won‘t regret it!" << endl;

    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    int carrots;
    carrots = 25;
    cout << "I have ";
    cout << carrots;
    cout << " carrots.";
    cout << endl;
    carrots = carrots - 1;
    cout << "Crunch, crunch. Now I have " << carrots << " carrots." << endl;
    
    cin.get();
    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    int carrots;

    cout << "How many carrots do you have?" << endl;
    cin >> carrots;
    cout << "Here are two more.";
    carrots = carrots + 2;
    cout << "Now you have " << carrots << " carrots." << endl;

    cin.get();
    cin.get();
    return 0;
}

#include <iostream>
#include <cmath>

int main() {
    using namespace std;

    double area;
    cout << "Enter the floor area,in square feet,of your home: ";
    cin >> area;
    double side;
    side = sqrt(area);
    cout << "That‘s the equivalent of a square " << side
        << " feet to the side." << endl;
    cout << "How fascinating!" << endl;

    cin.get();
    cin.get();
    return 0;
}

#include <iostream>

void simon(int);

int main() {
    using namespace std;

    simon(3);
    cout << "Pick an integer: ";
    int count;
    cin >> count;
    simon(count);
    cout << "Done!" << endl;
    
    cin.get();
    cin.get();
    return 0;
}

void simon(int n) {
    using namespace std;
    cout << "Simon says touch your toes " << n << " times." << endl;
}

#include <iostream>

int stonetolb(int);

int main() {
    using namespace std;
    int stone;
    cout << "Enter the weight in stone: ";
    cin >> stone;
    int pounds = stonetolb(stone);
    cout << stone << " stone = ";
    cout << pounds << " pounds." << endl;

    cin.get();
    cin.get();

    return 0;
}

int stonetolb(int sts) {
    return 14 * sts;
}

#include <iostream>
#include <climits>

int main() {
    using namespace std;

    int n_int = INT_MAX;
    short n_short = SHRT_MAX;
    long n_long = LONG_MAX;
    long long n_llong = LLONG_MAX;

    cout << "int is " << sizeof(int) << " bytes." << endl;
    cout << "short is " << sizeof n_short << " bytes." << endl;
    cout << "long is " << sizeof n_long << " bytes." << endl;
    cout << "long long is " << sizeof n_llong << " bytes." << endl;
    cout << endl;

    cout << "Maximum values:" << endl;
    cout << "int: " << n_int << endl;
    cout << "short: " << n_short << endl;
    cout << "long: " << n_long << endl;
    cout << "long long: " << n_llong << endl << endl;
    cout << "Minimum value = " << INT_MIN << endl;
    cout << "Bits per byte = " << CHAR_BIT << endl;

    cin.get();

    return 0;
}

#include <iostream>
#define ZERO 0
#include <climits>

int main() {
    using namespace std;
    short sam = SHRT_MAX;
    unsigned short sue = sam;

    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited." << endl
        << "Add $1 to each account." << endl << "Now ";
    sam = sam + 1;
    sue = sue + 1;
    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited.\nPoor Sam!" << endl;
    sam = ZERO;
    sue = ZERO;
    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited." << endl;
    cout << "Take $1 from each account." << endl << "Now ";
    sam = sam - 1;
    sue = sue - 1;
    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited." << endl << "Lucky Sue!" << endl;


    cin.get();
    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    int chest = 42;
    int waist = 0x42;
    int inseam = 042;

    cout << "Monsieur cuts a striking figure!\n";
    cout << "chest = " << chest << " (42 in decimal)\n";
    cout << "waist = " << waist << " (0x42 in hex)\n";
    cout << "inseam = " << inseam << " (042 in octal)\n";

    cin.get();
    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    int chest = 42;
    int waist = 42;
    int inseam = 42;

    cout << "Monsieur cuts a striking figure!" << endl;
    cout << "chest = " << chest << " (decimal for 42)" << endl;
    cout << hex;
    cout << "waist = " << waist << " (hexadecimal for 42)" << endl;
    cout << oct;
    cout << "inseam = " << inseam << " (octal for 42)" << endl;

    cin.get();
    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    char ch;

    cout << "Enter a character: " << endl;
    cin >> ch;
    cout << "Hola! ";
    cout << "Thank you for the " << ch << " character." << endl;
    
    cin.get();
    cin.get();
    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    char ch = ‘M‘;
    int i = ch;
    cout << "The ASCII code for " << ch << " is " << i << endl;
    cout << "Add one to the character code:" << endl;

    ch = ch + 1;
    i = ch;
    cout << "The ASCII code for " << ch << " is " << i << endl;

    cout << "Displaying char ch using cout.put(ch): ";
    cout.put(ch);

    cout.put(‘!‘);
    cout << endl << "Done" << endl;

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    cout.setf(ios_base::fixed, ios_base::floatfield);    // fixed-point
    float tub = 10.0 / 3.0;    // good to about 6 places
    double mint = 10.0 / 3.0;    // good to about 15 places
    const float million = 1.0e6;

    cout << "tub = " << tub;
    cout << ", a million tubs = " << million * tub;
    cout << ",\nand ten million tubs = ";
    cout << 10 * million * tub << endl;

    cout << "mint = " << mint << " and a million mints = ";
    cout << million * mint << endl;

    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    float a = 2.34E+22f;
    float b = a + 1.0f;

    cout << "a = " << a << endl;
    cout << "b - a = " << b - a << endl;

    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;
    float hats, heads;

    cout.setf(ios_base::fixed, ios_base::floatfield);
    cout << "Enter a number: ";
    cin >> hats;
    cout << "Enter another number: ";
    cin >> heads;

    cout << "hats = " << hats << "; heads = " << heads << endl;
    cout << "hats + heads = " << hats + heads << endl;
    cout << "hats - heads = " << hats - heads << endl;
    cout << "hats * heads = " << hats * heads << endl;
    cout << "hats / heads = " << hats / heads << endl;


    cin.get();
    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    cout.setf(ios_base::fixed, ios_base::floatfield);
    cout << "Integer division: 9 / 5 = " << 9 / 5 << endl;
    cout << "Floating-point division: 9.0 / 5.0 = ";
    cout << 9.0 / 5.0 << endl;
    cout << "Mixed divison: 9.0 / 5 = " << 9.0 / 5 << endl;
    cout << "double constants: 1e7/9.0 = ";
    cout << 1.e7 / 9.0 << endl;
    cout << "float constants: 1e7f/ 9.0f = ";
    cout << 1.e7f / 9.0f << endl;

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    const int Lbs_per_stn = 14;
    int lbs;

    cout << "Enter your weight in pounds: ";
    cin >> lbs;
    int stone = lbs / Lbs_per_stn;
    int pounds = lbs % Lbs_per_stn;
    cout << lbs << " pound are " << stone
        << " stone, " << pounds << " pound(s).\n";

    cin.get();
    cin.get();
    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    cout.setf(ios_base::fixed, ios_base::floatfield);
    float tree = 3;    // int converted to float
    int guess(3.9832);    // double converted to int
    int debt = 7.2E12;    // result not defined in C++
    cout << "tree = " << tree << endl;
    cout << "guess = " << guess << endl;
    cout << "debt = " << debt << endl;

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;
    int auks, bats, coots;

    // the following statement adds the values as double,
    // then converts the result to int
    auks = 19.99 + 11.99;

    // these statements add values as int
    bats = (int)19.99 + (int)11.99;    // old C syntax
    coots = int(19.99) + int(11.99);    // new C++ syntax;
    cout << "auks = " << auks << ", bats = " << bats;
    cout << ", coots = " << coots << endl;

    char ch = ‘Z‘;
    cout << "The code for " << ch << " is ";    // print as char
    cout << int(ch) << endl;    // print as int
    cout << "Yes, the code is ";
    cout << static_cast<int>(ch) << endl;    // using static_cast

    cin.get();
    return 0;

}

#include <iostream>

int main() {
    using namespace std;
    int yams[3];
    yams[0] = 7;
    yams[1] = 8;
    yams[2] = 6;

    int yamcosts[3] = { 20,30,5 };

    cout << "Total yams = ";
    cout << yams[0] + yams[1] + yams[2] << endl;

    cout << "The package with " << yams[1] << " yams costs ";
    cout << yamcosts[1] << " cents per yam.\n";
    
    int total = yams[0] * yamcosts[0] + yams[1] * yamcosts[1];
    total = total + yams[2] * yamcosts[2];
    cout << "The total yam expense is " << total << " cents.\n";

    cout << "\nSize of yams array = " << sizeof yams;
    cout << " bytes.\n";
    cout << "Size of one element = " << sizeof yams[0];
    cout << " bytes.\n";

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>
#include <cstring>

int main() {
    using namespace std;

    const int Size = 15;
    char name1[Size];
    char name2[Size] = "C++owboy";

    cout << "Howdy! I‘m " << name2;
    cout << "! What‘s your name?\n";
    cin >> name1;
    cout << "Well, " << name1 << ", your name has ";
    cout << strlen(name1) << " letters and is stored\n";
    cout << "in an array of " << sizeof(name1) << " bytes.\n";
    cout << "Your initial is " << name1[0] << ".\n";
    name2[3] = ‘\0‘;
    cout << "Here are the first 3 characters of my name: ";
    cout << name2 << endl;

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    const int ArSize = 20;
    char name[ArSize];
    char dessert[ArSize];

    cout << "Enter your name:\n";
    cin >> name;
    cout << "Enter your favorite dessert:\n";
    cin >> dessert;
    cout << "I have some delicious " << dessert;
    cout << " for you, " << name << ".\n";

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    const int ArSize = 20;
    char name[ArSize];
    char dessert[ArSize];

    cout << "Enter your name:\n";
    cin.getline(name, ArSize);
    cout << "Enter your favorite dessert:\n";
    cin.getline(dessert, ArSize);
    cout << "I have some delicious " << dessert;
    cout << " for you, " << name << ".\n";

    cin.get();

    return 0;
}

#include <iostream>

int main() {
    using namespace std;

    const int ArSize = 20;
    char name[ArSize];
    char dessert[ArSize];

    cout << "Enter your name:\n";
    cin.get(name, ArSize).get();
    cout << "Enter your favorite dessert:\n";
    cin.get(dessert, ArSize).get();
    cout << "I have some delicious " << dessert;
    cout << " for you, " << name << ".\n";

    cin.get();

    return 0;
}

#include <iostream>
#include <string>

int main() {
    using namespace std;

    char charr1[20];
    char charr2[20] = "jaguar";
    string str1;
    string str2 = "panther";

    cout << "Enter a kind of feline: ";
    cin >> charr1;
    cout << "Enter another kind of feline: ";
    cin >> str1;
    cout << "Here are some felines:\n";
    cout << charr1 << " " << charr2 << " "
        << str1 << " " << str2
        << endl;
    cout << "The thrid letter in " << charr2 << " is "
        << charr2[2] << endl;
    cout << "The third letter in " << str2 << " is "
        << str2[2] << endl;

    cin.get();
    cin.get();

    return 0;
}

#include <iostream>
#include <string>

int main() {
    using namespace std;

    string s1 = "penguin";
    string s2, s3;

    cout << "You can assign one string object to another: s2 = s1\n";
    s2 = s1;
    cout << "s1: " << s1 << ", s2: " << s2 << endl;
    cout << "You can assign a C-style string to a string object.\n";
    cout << "s2 = \"buzzard\"\n";
    s2 = "buzzard";
    cout << "s2: " << s2 << endl;
    cout << "You can concatenate strings: s3 = s1 + s2\n";
    s3 = s1 + s2;
    cout << "s3: " << s3 << endl;
    cout << "You can append strings.\n";
    s1 += s2;
    cout << "s1 += s2 yields s1 = " << s1 << endl;
    s2 += " for a day";
    cout << "s2 += \" for a day\" yields s2 = " << s2 << endl;

    cin.get();
    cin.get();

    return 0;
}