c++ primer plus 第六版编程练习答案第二章

2.1

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{
	char name[5],address[15];
	cout << "enter your name\n";
	cin >> name;
	cout <<"enter your address\n";
	cin >> address;
	cout << "your name is " << name << endl << "your address is " << address<<endl;
	return 0;

} 

注：cin、cout可以用于字符数组的输入输出且只需使用数组变量名即可，注意：cin将空格、换行等字符默认为输入字符数组结束标志

2.2

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{
	int transe(int dis);
	int dis,dis_t;
	cout << "enter the distence";
	cin >> dis;
	dis_t = transe(dis);
	cout << "the transform distance is " << dis_t << endl;
	return 0;
}
	int transe(int dis)
	{
		int dis_t;
		dis_t = -dis;
		return dis_t;
	}

注意：在主函数中进行函数声明

2.3

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{
	void fun1();
	void fun2();
	fun1();
	fun1();
	fun2();
	fun2();
	return 0;
}
void fun1()
{
	cout << "Three blind mice" << endl;
}
void fun2()
{
	cout << "see how they run" << endl;
}

2.4

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{
	int year, month;
	cout << "enter your age:";
	cin >> year;
	month = year * 12;
	cout << "the month of your age is:" << month;
	return 0;
}

2.5

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{
	double transf(double degree);
	double fahrent, dgree;
	cout << "please enter a Celsius value:";
	cin >> dgree;
	fahrent=transf(dgree);
	cout << dgree << " dgree Celsius is " << fahrent << " dgree Fahrenheit" << endl;
	return 0;
}

double transf(double degree)
{
	double fahren;
	fahren = 1.8*degree + 32.0;
	return fahren;
}

2.6

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{
	double transf(double degree);
	double liy, astu;
	cout << "enter the number of light year:";
	cin >> liy;
	astu=transf(liy);
	cout << liy<< " light year =  " << astu << " astronomical units" << endl;
	return 0;
}

double transf(double liy)
{
	double ast;
	ast = liy * 63240;
	return ast;
}

2.7

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()

{

	void display(int h, int m);
	int hour, minute;
	cout << "Enter the number of huors:";
	cin >> hour;
	cout << "Enter the number of minutes:";
	cin >> minute;
	display(hour, minute);
	return 0;
}

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