C++ Primer Plus Chapter3

C++ Primer Plus Chapter3

//3.1  #include<iostream>  int main(){using namespace std;int height, feet, inches;cout << "Enter your height(inches) ____\b\b\b\b";cin >> height;const int con_fac = 12;feet = height / con_fac;inches = height % con_fac;cout << "Your heght is " << feet << " feet and " << inches << " inches" << endl;return 0;}

//3.2  #include<iostream>  int main(){using namespace std;int feet, inches;double weight;cout << "Enter your height's feet,inches and weight(pound)" << endl;cin >> feet >> inches >> weight;const int con_fac_h = 12;const double con_fac_i = 0.0254;const double con_fac_w = 2.2;double height = feet * con_fac_h + inches;height = con_fac_i*height;weight = weight / con_fac_w;double BMI = weight / (height*height);cout << "BMI=" << BMI << endl;return 0;}

//3.3#include<iostream>int main(){using namespace std;int degrees, minutes, seconds;const double con_fac = 60;//转换因子cout << "Enter a latitude in degrees,minutes,and seconds:" << endl;cout << "First, enter the degrees:___\b\b\b";cin >> degrees;cout << "Next, enter the minutes of arc:___\b\b\b";cin >> minutes;cout << "Finally, enter the seconds of arc:___\b\b\b";cin >> seconds;cout << degrees << " degrees, " << minutes << " minutes, " << seconds << " seconds = ";        cout << degrees * 1 + minutes / con_fac + seconds / con_fac / con_fac << "degrees." << endl;return 0;}

//3.4  #include<iostream>  int main()  {      using namespace std;      long seconds;      cout << "Enter the number of seconds:";      const int con_day = 24, con_hour = 60, con_minutes = 60;      cin >> seconds;      int second = seconds % con_minutes;      int minutes = seconds / con_minutes%con_hour;      int hours = seconds / con_minutes / con_hour%con_day;      int days = seconds / con_minutes / con_hour / con_day;      cout << seconds << "seconds = " << days << " days, " << hours << " hours, ";    cout << minutes << " minutes, " << second << " second." << endl;      return 0;  }  

//3.5#include<iostream>int main(){using namespace std;float wor, ame;cout << "Enter the world's population:";cin >> wor;cout << "Enter the population of the US:";cin >> ame;float per = ame / wor;cout << "The population of the US is " << per*100 << "% of the world population." << endl;return 0;}

//3.6#include<iostream>int main(){using namespace std;float km, l;cout << "Enter the distance of driving(Km):";cin >> km;cout << "Enter the gasoline usage(L):";cin >> l;cout << "The fuel consumption per 100 kilometers is " << km / l / 100;return 0;}