C++Primerplus编程练习 第三章

第三章

1

#include <iostream>int main()
{using namespace std;cout << "请输入你的身高(英寸)____\b\b\b\b";int feet;cin >> feet;const int factor=12;cout << "你的身高为 "<< feet/factor<< "英尺 " << feet%factor << "英寸\n";    return 0;
}

2

#include <iostream>int main()
{using namespace std;const int footToInch=12;const float inchToMeter=0.0254;const float poundToKG = 1/2.2;float feet;float inches;float weight;cout << "请输入你的身高,按英尺 英寸的形式输入: ";cin>>feet;cin>>inches;cout<< "请输入你的体重(磅): ";cin >> weight;float meter = (feet*footToInch+inches)*inchToMeter;float kg = weight*poundToKG;                                                 cout << "你的BMI为 "<< kg/(meter*meter)<<endl;return 0;
}

3

#include <iostream>int main()
{using namespace std;double degrees;double minutes;double seconds;const int degreeToMinute = 60; const int minuteToSecond = 60; cout << "Enter a  latitude in degrees, minutes, and seconds: "<<endl;cout << "First, enter the degrees: ";cin >> degrees;cout << "Next, enter the minutes of arc: ";cin >> minutes;cout << "Finally, enter the seconds of arc: ";cin >> seconds;cout << degrees << " degrees, "<<minutes<<" minutes, "<<seconds;cout << " seconds = "<< degrees+(minutes+seconds*(1./minuteToSecond))*(return 0;
}

4

#include <iostream>int main()
{using namespace std;const int dayToHour = 24; const int hourToMinute = 60; const int minuteToSecond = 60; long long seconds;cout << "Enter the number of seconds: ";cin >> seconds;cout << seconds << " seconds = ";                                      int days = seconds/(dayToHour*hourToMinute*minuteToSecond);seconds =  seconds - days*dayToHour*hourToMinute*minuteToSecond;int hours = seconds/(hourToMinute*minuteToSecond);seconds = seconds - hours*hourToMinute*minuteToSecond;int minutes = seconds/(minuteToSecond);seconds = seconds - minutes*minuteToSecond;cout << days << " days, ";cout << hours << " hours, "<< minutes<<" minutes, ";cout << seconds <<" seconds\n";return 0;
}

5

#include <iostream>int main()
{using namespace std;long long worldPopulation;long long usPopulation;cout << "Enter the world's population: ";cin >> worldPopulation;cout << "Enter the population of the US: ";cin >> usPopulation;cout << "The population of the US is " << 100.0*usPopulation/worldPopulcout << "% of the world population.\n";                                return 0;
}

6

#include <iostream>int main()
{using namespace std;double distance;double gasoline;cout << "请输入距离(公里): ";cin >> distance;cout << "请输入消耗汽油量: ";cin >> gasoline;cout << "每100公里消耗 " << gasoline/distance*100 << " 升汽油"<<endl;return 0;
}

7

#include <iostream>int main()
{using namespace std;double fuelConsumption;const double kilometer100ToMiles = 62.14;const double gallonToLiter = 3.875;cout << "请输入你的百公里耗油量: ";cin >> fuelConsumption;cout << "相当于 " << kilometer100ToMiles/(fuelConsumption/gallonToLiterreturn 0;
}