C++ primer Plus(第六版)课后编程题

C++ primer Plus(第六版)课后编程题

第二章

2-1

#include<iostream>
using namespace std;

int main(){
        cout<<"My name is Xin Tang,and I come from Zhangzhou,Henan."<<endl;
}

2-2

#include<iostream>
using namespace std;

double furtoyd(double furlong);

int main(void){
        double furlong;
        cout<<"Please enter the distance measured by furlong units: ";
        cin>>furlong;
        cout<<endl<<furlong<<"  furlong is "<<furtoyd(furlong) <<" yd.";
        return 0;
}
double furtoyd(double furlong){
    return 220*furlong;
}

2-3

#include<iostream>
using namespace std;

void pri1(void);
void pri2(void);

int main(void){
        pri1();
        pri1();
        pri2();
        pri2();
        return 0;
}
void pri1(void){
    cout<<"Three blind mice"<<endl;
    }
void pri2(void){
    cout<<"See how they run"<<endl;
}

2-4

#include<iostream>
using namespace std;
int yeartomonth(int year);
int main(void){
    int age;
    cout<<"Please enter you age:";
    cin>>age;
    cout<<"Your age is "<<yeartomonth(age)<<" months.";
    return 0;
}

int yeartomonth(int year){
    return 12*year;
    }

2-5

#include<iostream>
using namespace std;

double celtoFahren(double celsius);

int main(void){
    double celsius;
    cout<<"Please enter a Celsius value:";
    cin>>celsius;
    cout<<celsius<<"degrees Celsius is "<<celtoFahren(celsius)<<" degree Fahreheit.";
    return 0;
}

double celtoFahren(double celsius){
    return 1.8*celsius+32.0;
    }

2-6

#include<iostream>
using namespace std;

double lightyeartoastro(double lightyear);

int main(void){
    double lightyear;
    cout<<"Please enter the number o light years : ";
    cin>>lightyear;
    cout<<lightyear<<" light years =  "<<lightyeartoastro(lightyear)<<" astronimical units.";
    return 0;
}

double lightyeartoastro(double lightyear){
    return lightyear*63240;
}

2-7

#include<iostream>
using namespace std;

int main(void){
    int hours;
    int minutes;
    cout<<"Enter the number of hours : ";
    cin>>hours;
    cout<<"Enter the number of minutes : ";
    cin>>minutes;
    cout<<"Time : "<<hours<<" : "<<minutes<<endl;
    return 0;
}

第三章

3-1

#include<iostream>
//const 常量，1英尺=12英寸
const int inch_per_feet=12;
int main(void){
    using namespace std;
    int ht_inch;
    cout<<"Enter your height_inch : ___\b\b\b ";
    cin>>ht_inch;
    cout<<"Your height_feet is  : " <<ht_inch/inch_to_feet<<" feet and "<<ht_inch%inch_to_feet<<" inch.";
     return 0;
}

3-2

#include<iostream>
//const 常量，1英尺=12英寸
const int inch_per_feet=12;
//1英寸=0.0254米
const double meter_per_inch=0.0254;
//1磅=2.2千克
const double pound_per_kilogram=2.2;
int main(void){
    using namespace std;
    int ht_inch,ht_feet;
    double wt_pound;
    cout<<"Enter your height : \n";
    cout<<"First enter your height of feet part : _\b ";
    cin>>ht_feet;
    cout<<"First enter your height of inch part : _\b" ;
    cin>>ht_inch;
    cout<<"Then enter your weight in pound : ___\b\b\b";
    cin>>wt_pound;
    double ht_meter;
    ht_meter=meter_per_inch*(ht_inch+ht_feet*inch_per_feet);
    cout<<"身高为："<<ht_meter<<" 米。\n";
    double weight_kilo;
    weight_kilo=pound_per_kilogram*wt_pound;
    cout<<"体重为："<<ht_meter<<" 千克。\n";
    double BMI;
    BMI=weight_kilo/(ht_meter*ht_meter);
    cout<<"BMI为："<<BMI;
     return 0;
}

3-3

#include<iostream>
//1度=60分
const int minutes_per_degree=60;
//1分=60秒
const int seconds_per_minute=60;
int main(void){
    using namespace std;
    int degrees,minutes,seconds;
    double degree_all;
    cout<<"Enter a latitude in degrees ,minutes, and seconds: \n";
    cout<<"First enter the degree: _\b ";
    cin>>degrees;
    cout<<"Next, enter the minutes of arc: _\b ";
    cin>>minutes;
    cout<<"Finally, enter the seconds of arc: _\b ";
    cin>>seconds;
    cout<<degrees<<"  degrees ，"<<minutes<<" minutes，"<<seconds<<" seconds = "<<(double)degrees+(double)minutes/minutes_per_degree+(double)seconds_per_minute/minutes_per_degree/seconds_per_minute<<" degrees.";
     return 0;
}

3-4

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#include<iostream>
const int hours_per_day=24;
const int minutes_per_hours=60;
const int seconds_per_minute=60;
int main(void){
    using namespace std;
    int days,hours,minutes,seconds,second;
    cout<<"Enter the number of seconds:_____\b\b\b\b\b ";
    cin>>seconds;
    days=seconds/seconds_per_minute/minutes_per_hours/hours_per_day;
    hours=seconds/seconds_per_minute/minutes_per_hours%hours_per_day;
    minutes=seconds/seconds_per_minute%minutes_per_hours;
    second=seconds%seconds_per_minute;
    cout<<seconds<<"  seconds = "
            <<days<<" days , "<<hours<<" hours , "<<minutes<<" minutes , "<<second<<" seconds .";
     return 0;
}

3-5

#include<iostream>
int main(void){
    using namespace std;
    long long world_pop,Ame_pop;
    double percentage;
    cout<<"Enter the world's population:_____\b\b\b\b\b ";
    cin>>world_pop;
    cout<<"Enter the  population of the US:_____\b\b\b\b\b ";
    cin>>Ame_pop;
    percentage=(double)Ame_pop/world_pop*100;
    cout<<"The population of the US is "<<percentage<<" % of the world population. ";
     return 0;
}

3-6

#include<iostream>
int main(void){
    using namespace std;
    double m_distance,m_gasoline,k_distance,k_gasoline;
    cout<<"Enter the miles of distance you have driven:___\b\b\b ";
    cin>>m_distance;
    cout<<"Enter the gallons of gasoline you have used:___\b\b\b ";
    cin>>m_gasoline;
    cout<<"Your car can run "<<m_distance/m_gasoline<<" miles per gallon.\n";
     cout<<"Enter the kilograms of distance you have driven:___\b\b\b ";
    cin>>k_distance;
    cout<<"Enter the petrol in liters you have used:___\b\b\b ";
    cin>>k_gasoline;
    cout<<"In European : Your car can run "<<100*k_gasoline/k_distance<<" liter of petrol per 100 kilometer.\n";
     return 0;
}

3-7

#include<iostream>
int main(void){
    using namespace std;
    double u_style,m_style;
    cout<<"Enter the fuel consumption in European(L/km):___\b\b\b ";
    cin>>u_style;
    cout<<"converts to US_Style(miles per gallon) "<<u_style<<" L/km = "<<3.875*62.14/u_style<<" mpg.\n";
     return 0;
}

第四章

待更新