C++ Primer Plus第二章习题

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1 篇文章

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本文提供了多个C++编程示例，包括基本输出、输入处理、函数调用等，适合初学者练习掌握C++语法。

2.1

#include<iostream>
using std::cout;
using std::endl;
int main()
{
    cout<<"My Name is :"<<endl<<"My address is:"<<endl;
    return 0;
}

2.2

#include<iostream>
using std::cout;
using std::endl;
using std::cin;

int main()
{
    double l;
    int yard = 22;
    cin>>l;
    cout<<yard * l << endl;
    return 0;
}

2.3

#include<iostream>
using std::cout;
using std::endl;


void Print1()
{
    cout<<"Three blind mice"<<endl;
}


void Print2()
{
    cout<<"See how they run"<<endl;
}


int main()
{
    Print1();
    Print1();
    Print2();
    Print2();
    return 0;
}

2.4

#include<iostream>
using std::cin;
using std::cout;
using std::endl;

int main()
{
    int age, months;
    cout<<"Enter your age: ";
    cin>>age;
    months = age * 12;
    cout<<months<<endl;
    return 0;
}

2.5

#include<iostream>
#include<iomanip>
using std::cout;
using std::cin;
using std::endl;
using std::ios;
using std::setprecision;
double f(double C)
{
    return 1.8 * C + 32.0;
}
int main()
{
    double C, F;
    cout.setf(ios::fixed);
    cout<<"Please Enter a Celsius value: ";
    cin>>C;
    cout<<setprecision(1)<<C<<" degrees Celsius is "<<setprecision(1)<<f(C)<<" degrees  Fahrenheit"<<endl;

    return 0;
}

2.6

#include<iostream>
#include<iomanip>
using std::cout;
using std::cin;
using std::endl;
using std::ios;
using std::setprecision;
double f(double C)
{
    return C * 63240;
}
int main()
{
    double LightYear, F;
    cout.setf(ios::fixed);
    cout<<"Enter the number of light years: ";
    cin>>LightYear;
    cout<<setprecision(1)<<LightYear<<" light years is "<<f(LightYear)<<" astronomical units"<<endl;
    return 0;
}

2.7

#include<iostream>
using std::cout;
using std::cin;
using std::endl;

void Time(int h, int m)
{
    cout<<"Time: "<<h<<":"<<m<<endl;
}


int main()
{
    int h, m;
    cin>>h>>m;
    Time(h, m);
    return 0;
}