标签：using cal 英文 sig har mes float address namespace
a. char actors[30];
b. short betsie[100];
c. float chunk[13];
d. long double dipsea[64];
a. array<char, 30> actors;
b. array<short, 100> betsie;
c. array<float, 13> chunk;
d. array<long double, 64> dipsea;
int oddly[5] = {1, 3, 5, 7, 9};
int even = oddly[0] + oddly[4];
cout << ideas[1] << "\n"; // or << endl;
char lunch[13] = "cheeseburger"; // number of characters + 1
or
char lunch[] = "cheeseburger"; // let the compiler count elements
string lunch = "Waldorf Salad";
or, if you don‘t have a using directive,
std::string lunch = "Waldorf Salad";
struct fish
{
char kind[20];
int weight;
float length;
};fish petes =
{
"trout",
12,
26.66
}enum Response {No, Yes, Maybe};
double * pd = &ted;
cout << *pd << "\n";float * pf = treacle; // or = &treacle[0]
cout << pf[0] << " " << pf[9] << "\n";
// or use *pf and *(pf + 9)This assumes that the iostream and vector header files have been included and that there is a using directive:
unsigned int size;
cout << "Enter a positive integer: ";
cin >> size;
int * dyn = new int [size];
vector<int> dv(size);Yes, it is valid. The expression "Home of the jolly bytes" is a string constant; hence it evaluates as the address of the beginning of the string. The cout object interprets the address of a char as an invitation to print a string, but the type cast (int *) converts the address to type pointer-to-int, which is then printed as an address. In short, the statement prints the address of the string, assuming the int type is wide enough to hold an address.
struct fish
{
char kind[20];
int weight;
float length;
};
fish * pole = new fish;
cout << "Enter kind of fish: ";
cin >> pole -> kind;Using cin >> address causes a program to skip over whitespace until it finds non-whitespace. It then reads characters until it encounters whitespace again. Thus, it will skip over the newline following the numeric input, avoiding that problem. On the other hand, it will read just a single word, not an entire line.
#include <string>
#include <vector>
#include <array>
const int Str_num {10}; // or = 10
...
std::vector<std::string> vstr(Str_num);
std::array<std::string, Str_num> astr;#include <iostream>
int main()
{
using namespace std;
cout << "What is your first name? ";
char first_name[20];
cin.getline(first_name, 20);
cout << "What is your last name? ";
char last_name[20];
cin.getline(last_name, 20);
cout << "What letter grade do you deserve? ";
char grade;
cin.get(grade);
cout << "What is your age? ";
int age;
cin >> age;
cout << "Name: " << last_name << ", " << first_name << endl
<< "Grade: " << grade << "\n"
<< "Age: " << age << endl;
return 0;
}#include <iostream>
#include <string>
int main()
{
using namespace std;
string name;
string dessert;
cout << "Enter your name: \n";
getline(cin, name);
cout << "Enter your favorite dessert: \n";
getline(cin, dessert);
cout << "I have some delicious " << dessert;
cout << " for you, " << name << ".\n";
return 0;
}#include <iostream>
#include <cstring>
int main()
{
using namespace std;
char first_name[20], last_name[20];
char combined[40];
cout << "Enter your first name: ";
cin >> first_name;
cout << "Enter your favorite last name: ";
cin >> last_name;
strcpy(combined, last_name);
strcat(combined, ", ");
strcat(combined, first_name);
cout << "Here's the information in a single string: " << combined << endl;
return 0;
}#include <iostream>
#include <string>
int main()
{
using namespace std;
string first_name, last_name, combined;
cout << "Enter your first name: ";
cin >> first_name;
cout << "Enter your favorite last name: ";
cin >> last_name;
combined = last_name + ", " + first_name;
cout << "Here's the information in a single string: " << combined << endl;
return 0;
}#include <iostream>
#include <string>
struct CandyBar
{
std::string brand;
float weight;
int calories;
};
int main()
{
using namespace std;
CandyBar snack = {"Mocha Munch", 2.3, 350};
cout << "Brand: " << snack.brand << "\nWeight: " << snack.weight
<< "\nCalories = " << snack.calories << endl;
return 0;
}#include <iostream>
#include <string>
struct CandyBar
{
std::string brand;
float weight;
int cal;
};
int main()
{
using namespace std;
CandyBar snack[3] = {{"Mocha Munch", 2.3, 350}, {"Wei Long", 0.5, 222}, {"crisps", 1.0, 500}};
cout << "Brand: " << snack[0].brand << endl
<< "Weight: " << snack[0].weight << endl
<< "Calories: " << snack[0].cal << endl << endl;
cout << "Brand: " << snack[1].brand << endl
<< "Weight: " << snack[1].weight << endl
<< "Calories: " << snack[1].cal << endl << endl;
cout << "Brand: " << snack[2].brand << endl
<< "Weight: " << snack[2].weight << endl
<< "Calories: " << snack[2].cal << endl << endl;
return 0;
}#include <iostream>
#include <string>
using namespace std;
struct Pizza
{
string company;
float diameter;
float weight;
};
int main()
{
Pizza piz;
cout << "Enter the pizza's company: ";
getline(cin, piz.company);
cout << "Enter the pizza's diameter(in CM): ";
cin >> piz.diameter;
cout << "Enter the pizza's weight(in Kg): ";
cin >> piz.weight;
cout << "Company: " << piz.company << endl;
cout << "Diameter: " << piz.diameter << " CM" << endl;
cout << "Weight: " << piz.weight << " Kg" << endl;
return 0;
}#include <iostream>
#include <string>
using namespace std;
struct Pizza
{
string company;
float diameter;
float weight;
};
int main()
{
Pizza * piz = new Pizza;
cout << "Enter the pizza's company: ";
getline(cin, piz -> company);
cout << "Enter the pizza's diameter(in CM): ";
cin >> piz -> diameter;
cout << "Enter the pizza's weight(in Kg): ";
cin >> piz -> weight;
cout << "Company: " << piz -> company << endl;
cout << "Diameter: " << piz -> diameter << " CM" << endl;
cout << "Weight: " << piz -> weight << " Kg" << endl;
return 0;
}#include <iostream>
#include <string>
struct CandyBar
{
std::string brand;
float weight;
int cal;
};
int main()
{
using namespace std;
CandyBar * snack = new CandyBar[3];
snack[0] = {"Mocha Munch", 2.3, 350};
snack[1] = {"Wei Long", 0.5, 222};
snack[2] = {"crisps", 1.0, 500};
cout << "Brand: " << snack[0].brand << endl
<< "Weight: " << snack[0].weight << endl
<< "Calories: " << snack[0].cal << endl << endl;
cout << "Brand: " << snack[1].brand << endl
<< "Weight: " << snack[1].weight << endl
<< "Calories: " << snack[1].cal << endl << endl;
cout << "Brand: " << snack[2].brand << endl
<< "Weight: " << snack[2].weight << endl
<< "Calories: " << snack[2].cal << endl << endl;
delete [] snack;
return 0;
}#include <iostream>
#include <array>
int main()
{
using namespace std;
cout << "Enter your three 40-yard runnings' scores: ";
array<float, 3> scores;
cin >> scores[0] >> scores[1] >> scores[2];
cout << "Average: " << (scores[0] + scores[1] + scores[2]) / 3.0 << endl;
return 0;
}《C++ primer plus 英文版 第六版》Chapter 4
标签：using cal 英文 sig har mes float address namespace
原文地址：https://www.cnblogs.com/narisu/p/8970995.html
