第二章

#include<iostream>

using namespace std;

int main()
{
    cout << "My name is Jiantong Chen." << endl << "I‘m a student in the Xi‘an University.";
    cin.get();
    return 0;
}

#include<iostream>
using namespace std;

int main()
{
    int a;
    cout << "Please enter a number of the long:";
    cin >> a;
    cout << endl << "The ma of it is:" << (a*220);
    cin.get();
    cin.get();
    return 0;
}

#include<iostream>
void print_1(void);
void print_2(void);

using namespace std;

int main()
{
    print_1();
    print_1();
    print_2();
    print_2();
    cin.get();
    return 0;
}

void print_1(void)
{
    cout << "Three blind mice" << endl;
}

void print_2(void)
{
    cout << "See how they run" << endl;
}

#include<iostream>

using namespace std;

int main()
{
    int age;
    cout << "Enter you age:";
    cin >> age;
    cout << endl << "This age contains " << (age*12) << " months.";
    cin.get();
    cin.get();
    return 0;
}

#include<iostream>
using namespace std;
double convert(double);

int main()
{
    int Celsius;
    double Fahrenheit;
    cout << "Please enter a Celsius value: ";
    cin >> Celsius;
    Fahrenheit = convert(Celsius);
    cout << endl << Celsius << " degrees Celsius is " << Fahrenheit << " degrees Fahrenheit.";
    cin.get();
    cin.get();
    return 0;
}

double convert(double Celsius)
{
    double Fahrenheit;
    Fahrenheit = 1.8*Celsius + 32.0;
    return Fahrenheit;
}

#include<iostream>
using namespace std;
double convert(double);

int main()
{
    double in_put;
    double out_put;
    cout << "Enter the number of light years: ";
    cin >> in_put;
    out_put = convert(in_put);
    cout << endl << in_put << " light years = " << out_put << " astronomical units.";
    cin.get();
    cin.get();
    return 0;
}

double convert(double in_put)
{
    double out_put;
    out_put = in_put * 63240;
    return out_put;
}

#include<iostream>
using namespace std;
void display(int, int);

int main()
{
    int hours;
    int minutes;

    cout << "Enter the number of hours : ";
    cin >> hours;
    cout << "Enter the number of minutes : ";
    cin >> minutes;

    display(hours, minutes);
    cin.get();
    cin.get();
    return 0;
}

void display(int a,int b)
{
    cout << "Time: " << a << ":" << b;
}