第2章

题目

程序

2.1：

#include <iostream>

int main()
{
	using namespace std;
	cout<<"My name is : mxh."<<endl;
	cout<<"My address is : university."<<endl;
	return 0;
}

2.2:

#include <iostream>

int main()
{
	using namespace std;
	cout<<"How long is it: ";
	int l;
	cin>>l;
	cout<<"It is "<<l*220<<" 码."<<endl;
	return 0;
}

2.3:

#include <iostream>
using namespace std;
void animal();
void learn();


int main()
{
	animal();
	animal();
	learn();
	learn();
	return 0;
}

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

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

2.4:

#include <iostream>

int main()
{
	using namespace std;
	cout<<"Enter your age: ";
	int age;
	cin>>age;
	cout<<"It contains "<<age*12<<" months."<<endl;
	
	return 0;
}

2.5:

#include <iostream>
using namespace std;
int trans(int c);

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

int trans(int c)
{
	int f=1.8*c+32.0;
	return f;
}

2.6:

#include <iostream>
using namespace std;
int trans(double light);

int main()
{
	cout<<"light years: ";
	double light;
	cin>>light;
	int ast=trans(light);
	cout<<light<<" light years = "<<ast<<" astronomical units."<<endl;
	return 0;
}

int trans(double light)
{
	int ast = 63240*light;
	return ast;
}

2.7:

#include <iostream>
using namespace std;
void time(int h,int m);

int main()
{
	int h,m;
	time(h,m);
	return 0;
}

void time(int h,int m)
{
	cout<<"Enter the number of hours: ";
	cin>>h;
	cout<<"Enter the number of minutes: ";
	cin>>m;
	cout<<"Time: "<<h<<" : "<<m<<endl;
}

第3章

题目：

程序：

3.1:

#include <iostream>

int main()
{
	using namespace std;
	int tall;
	const int n=12;
	cout<<"How tall are you(inch):____\b\b\b\b";
	cin>>tall;
	cout<<"It is "<<tall/n<<" feet and "<<tall%n<<" inch.\n";	
	return 0;
}

3.2:

#include <iostream>

int main()
{
	using namespace std;
	int feet,inch,weight;
	const int m=12;
	const double n=0.0254;
	const double w=2.2;
	
	cout<<"Your height: ";
	cin>>feet>>inch;
	cout<<feet<<" feet and "<<inch<<" inch."<<endl;
	cout<<"Your weight: ";
	cin>>weight;
	
	double h=(feet*m+inch)*n;
	double W=weight*w;
	double BMI=W/(h*h);
	
	cout<<"The BMI is: "<<BMI<<endl;
	return 0;
}

3.3:

#include <iostream>

int main()
{
	using namespace std;
	int deg,min,sec;
	const double m=60;
	const double n=60;
	
	cout<<"Enter degrees,minutes, and seconds :";
	cout<<"First,enter the degrees:";
	cin>>deg;
	cout<<"The minutes:";
	cin>>min;
	cout<<"The seconds:";
	cin>>sec;
	double d=deg+min/m+sec/m/n;
	cout<<deg<<"degrees,"<<min<<"minutes,"<<sec<<"seconds="<<d<<"degrees";
	return 0;
}

3.4:

#include <iostream>

int main()
{
	using namespace std;
	int d,h,m,s;
	long sec;
	const int dTh=24;
	const int hTm=60;
	const int mTs=60;
	
	cout<<"Enter the seconds:";
	cin>>sec;
	
	s=sec%mTs;
	m=sec/mTs;
	h=m/hTm;
	m=m%hTm;
	d=h/dTh;
	h=h%dTh;
	
	cout<<sec<<" second s = "<<d<<" days, "<<h<<" hours, "<<m<<" minutes, "<<s<<" seconds";
	
	return 0;
}

3.5:

#include <iostream>

int main()
{
	using namespace std;
	long long gp,ap;
	double p;
	
	cout<<"The world's population: ";
	cin>>gp;
	cout<<"The US population: ";
	cin>>ap;
	p=double(ap)/double(gp)*100;
	cout<<"The US is "<<p<<"% of the world.";
	
	return 0;
}

3.7:

#include <iostream>

int main()
{
	using namespace std;
	double e,a;
	const double l=62.14, c=3.875;
	
	
	cout<<"The European fuel consumption: ";
	cin>>e;
	a=c*l/e;
	cout<<"The US fuel consumption: "<<a<<endl;
	
	return 0;
}