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C++--primer-plus-(第6版)-中文版编程练习答案2

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第二章：开始学习C++//ex2.1--display your name and address#include<iostream>int main(void

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第二章：开始学习C++

//ex2.1--display your name and address

#include<iostream>

int main(void)

{

using namespace std;

cout<<"My name is liao chunguang and I live in hunan chenzhou.”；

}

//ex2.2--convert the furlong units to yard uints-把浪单位换位码单位

#include<iostream>

double fur2yd(double);

int main()

{

using namespace std;

cout<<"enter the distance measured by furlong units:";

double fur;

cin>>fur;

cout<<"convert the furlong to yard"<<endl;

double yd;

yd=fur2yd(fur);

cout<<fur<<" furlong is "<<yd<<" yard"<<endl;

return 0;

}

double fur2yd(double t)

{

return 220*t;

}

//ex2.3-每个函数都被调用两次

#include<iostream>

void mice();

void see();

using namespace std;

int main()

{

mice();

see();

return 0;

}

void mice()

{

cout<<"three blind mice"<<endl;

}

void see()

{

cout<<"see how they run"<<endl;

}

//ex2.4

#include<iostream>

int main()

{

using namespace std;

cout<<"Enter your age:";

int age;

cin>>age;

int month;

month=age*12;

cout<<age<<" years is "<<month<<" months"<<endl;

return 0;

}

//ex2.5---convert the Celsius valve to Fahrenheit value

#include<iostream>

double C2F(double);

int main()

{

using namespace std;

cout<<"please enter a Celsius value:";

double C;

cin>>C;

double F;

F=C2F(C);

cout<<C<<" degrees Celsius is "<<F<<" degrees Fahrenheit."<<endl;

return 0;

}

double C2F(double t)

{

return 1.8*t+32;

}

//ex2.6---convert the light years valve to astronomical units--把光年转换为天文单位

#include<iostream>

double convert(double);//函数原型

int main()

{

using namespace std;

cout<<"Enter the number of light years:";

double light_years;

cin>>light_years;

double astro_units;

astro_units=convert(light_years);

cout<<light_years<<" light_years = "<<astro_units<<" astronomical units."<<endl;

return 0;

}

double convert(double t)

{

return 63240*t;//1 光年=63240 天文单位

}

//ex2.7--显示用户输入的小时数和分钟数

#include<iostream>

void show();

main()

{

using namespace std;

show();

return 0;

}

void show()

{

using namespace std;

int h,m;

cout<<"enter the number of hours:";

cin>>h;

cout<<"enter the number of minutes:";

cin>>m;

cout<<"Time:"<<h<<":"<<m<<endl;

}

第三章：处理数据

//ex3.1—将身高用英尺(feet)和英寸(inch)表示

#include<iostream>

const int inch_per_feet=12;// const 常量--1feet=12inches--1 英尺=12 英寸

int main()

{

using namespace std;

cout<<"please enter your height in inches:___\b\b\b";// \b 表示为退格字符

int ht_inch;

cin>>ht_inch;

int ht_feet=ht_inch/inch_per_feet;//取商

int rm_inch=ht_inch%inch_per_feet;//取余

cout<<"your height is "<<ht_feet<<" feet,and "

<<rm_inch<<" inches\n";

return 0;

}

//ex3.2--计算相应的body mass index（体重指数）

#include<iostream>

const int inch_per_feet=12;

const double meter_per_inch=0.0254;

const double pound_per_kilogram=2.2;

int main()

{

using namespace std;

cout<<"Please enter your height:"<<endl;

cout<<"First,enter your height of feet part（输入你身高的英尺部分）:_\b";

int ht_feet;

cin>>ht_feet;

cout<<"Second,enter your height of inch part（输入你身高的英寸部分）:_\b";

int ht_inch;

cin>>ht_inch;

cout<<"Now,please enter your weight in pound:___\b\b\b";

double wt_pound;

cin>>wt_pound;

int inch;

inch=ht_feet*inch_per_feet+ht_inch;

double ht_meter;

ht_meter=inch*meter_per_inch;

double wt_kilogram;

wt_kilogram=wt_pound/pound_per_kilogram;

cout<<endl;

cout<<"Your pensonal body information as follows:"<<endl;

cout<<"身高:"<<inch<<"(英尺inch)\n"<<"身高:"<<ht_meter<<"(米meter)\n"

<<"体重:"<<wt_kilogram<<"(千克kilogram)\n";

double BMI;

BMI=wt_kilogram/(ht_meter*ht_meter);

cout<<"your Body Mass Index(体重指数) is "<<BMI<<endl;

return 0;

}

//ex3.3 以度，分，秒输入，以度输出

#include<iostream>

const int minutes_per_degree=60;

const int seconds_per_minute=60;

int main()

{

using namespace std;

cout<<"Enter a latitude in degrees,minutes,and seconds:\n";

cout<<"First,enter the degrees:";

int degree;

cin>>degree;

cout<<"Next,enter the minutes of arc:";

int minute;

cin>>minute;

cout<<"Fianlly,enter the seconds of arc:";

int second;

cin>>second;

double show_in_degree;

show_in_degree=(double)degree+(double)minute/minutes_per_degree+(double)second/mi

nutes_per_degree/seconds_per_minute;

cout<<degree<<" degrees,"<<minute<<" minutes,"<<second<<"seconds

="<<show_in_degree<<" degrees\n";

return 0;

}

//ex3.4

#include<iostream>

const int hours_per_day=24;

const int minutes_per_hour=60;

const int seconds_per_minute=60;

int main()

{

using namespace std;

cout<<"Enter the number of seconds:";

long seconds;

cin>>seconds;

int Day,Hour,Minute,Second;

Day=seconds/seconds_per_minute/minutes_per_hour/hours_per_day;

Hour=seconds/seconds_per_minute/minutes_per_hour%hours_per_day;

Minute=seconds/seconds_per_minute%minutes_per_hour;

Second=seconds%seconds_per_minute;

cout<<seconds<<"seconds = "<<Day<<" days,"<<Hour<<" hours,"<<Minute<<"

minutes,"<<Second<<" seconds\n";

return 0;

}

//ex3.5

#include<iostream>

int main()

{

using namespace std;

cout<<"Enter the world population:";

long long world_population;

cin>>world_population;

cout<<"Enter the population of the US:";

long long US_population;

cin>>US_population;

double percentage;

percentage=(double)US_population/world_population*100;

cout<<"The population of the US is "<<percentage<<"% of the world population.\n";

return 0;

}

//ex3.6 汽车耗油量-美国(mpg)or 欧洲风格(L/100Km)

#include<iostream>

int main()

{

using namespace std;

cout<<"Enter the miles of distance you have driven:";

double m_distance;

cin>>m_distance;

cout<<"Enter the gallons of gasoline you have used:";

double m_gasoline;

cin>>m_gasoline;

cout<<"Your car can run "<<m_distance/m_gasoline<<" miles per gallon\n";

cout<<"Computing by European style:\n";

cout<<"Enter the distance in kilometers:";

double k_distance;

cin>>k_distance;

cout<<"Enter the petrol in liters:";

double k_gasoline;

cin>>k_gasoline;

cout<<"In European style:"<<"your can used "<<100*k_gasoline/k_distance<<" liters of petrol

per 100 kilometers\n";

return 0;

}

//ex3.7 automobile gasoline consumption-耗油量--欧洲风格(L/100Km)转换成美国风格(mpg)

#include<iostream>

int main()

{

using namespace std;

cout<<"Enter the automobile gasoline consumption figure in\n"

<<"European style(liters per 100 kilometers):";

double Euro_style;

cin>>Euro_style;

cout<<"Converts to U.S. style(miles per gallon):"<<endl;

cout<<Euro_style<<" L/100Km = "<<62.14*3.875/Euro_style<<" mpg\n";

return 0;

}

// Note that 100 kilometers is 62.14 miles, and 1 gallon is 3.875 liters.

//Thus, 19 mpg is about 12.4 L/100Km, and 27 mpg is about 8.7 L/100Km.

Enter the automobile gasoline consumption figure in

European style(liters per 100 kilometers):12.4

Converts to U.S. style(miles per gallon):

12.4 L/100Km = 19.4187 mpg

Press any key to continue

// ex3.7 automobile gasoline consumption-耗油量--美国风格(mpg)转换成欧洲风格(L/100Km)

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