首页 > 代码库 > c++primerplus(第六版)编程题——第3章(数据类型)
c++primerplus(第六版)编程题——第3章(数据类型)
声明:作者为了调试方便,每一章的程序写在一个工程文件中,每一道编程练习题新建一个独立文件,在主函数中调用,我建议同我一样的初学者可以采用这种方式,调试起来会比较方便。
工程命名和文件命名可以命名成易识别的名字,当然你也可以随便自定义,只是作者本人偏好:
工程名:cprimerplus6th_chapter0_conten.pro文件名:cprimerplus6th_exercise_0_0( )
主函数:
int main( int argc, char **argv){ //cprimerplus6th_exercise3_7_1(); //cprimerplus6th_exercise3_7_2(); //cprimerplus6th_exercise_3_7_3(); //cprimerplus6th_exercise3_7_4(); //cprimerplus6th_exercise3_7_5(); //cprimerplus6th_exercise3_7_6(); cprimerplus6th_exercise3_7_7(); return 0; }
1.编写一个小程序,要求用户使用一个整数指出自己的身高(单位为英寸),然后将身高转换为英尺和英寸。该程序使用下划线字符来指示输入位置。另外,使用一个const 符号常量来表示转换因子。
#include <iostream>
using namespace std;
void cprimerplus6th_exercise3_7_1(){ const int inch_to_foot = 12; // 1 foot = 12 inchs
cout << "Please enter your height(inchs):___\b\b\b"; int height_inch; cin >> height_inch; int height_foot; height_foot = height_inch / inch_to_foot; height_inch = height_inch % inch_to_foot; cout << "your height is " << height_foot << " foot " << height_inch << " inch"; }
2.编写一个小程序,要求以几英尺几英寸的方式输入其身高,并以磅为单位输入其体重。(使用3个变量来存储这些信息。)该程序报告其BMI(Body Mass Index,体重指数)。为了计算BMI,该程序以英寸的方式指出用户的身高(1英尺为12英寸),并将以英寸为单位的身高转换为以米为单位的身高(1英寸=0.0254米)。然后,将以磅为单位的体重转换为以千克为单位的体重(1kg=2.2磅)。最后,计算相应的BMI——体重(kg)除以身高(米)的平方。用符号常量表示各转换因子。
void cprimerplus_exercise3_7_2(){ const int inch_to_foot = 12; // 1 foot = 12 inchs const double meter_to_inch = 0.0254; // 1 inch = 0.0254 meters const double pound_to_kg = 2.2;// 1 kg = 2.2 pound int heigt_inch, height_foot; cout << "please enter your height(X foot X inchs):"<<endl; cout << "first enter your height in foot" << endl; cin >> height_foot; cout << "then enter your height in inch"<< endl; cin >> heigt_inch; cout << "your height is " << height_foot << " foot " << heigt_inch << "inches"<<endl; double height_meters; height_meters = (height_foot * inch_to_foot + heigt_inch) * meter_to_inch; double weight_pound; double weight_kg; cout << "Please enter your weight(pounds):" <<endl; cin >> weight_pound ; weight_kg = weight_pound * pound_to_kg; double body_mass_index; body_mass_index = weight_kg/(height_meters * height_meters); cout << ‘\n‘ << "your body mass index(BMI) is " << body_mass_index <<endl;}
3.编写一个程序,要求用户以度、分、秒的方式输入一个纬度,然后
void cprimerplus_exercise_3_7_3(){ const double minute_to_degree = 60.0; // 1 degree = 60 minutes const double second_to_minute = 60.0; // 1 minute = 60 seconds int degrees, minutes, seconds; cout << "Enter a latitude in degrees, minutes, and seconds:" << endl; cout << "enter the degrees:"; cin >> degrees; cout << "Next, enter the minutes of arc:" << endl; cin >> minutes; cout << "Finally, enter the seconds of arc:"; cin >> seconds; double total_degrees; total_degrees = degrees + minutes/minute_to_degree + seconds/(minute_to_degree * second_to_minute); cout << degrees << "degrees, " << minutes << "minutes, "<< seconds << "seconds = " << total_degrees << "degrees"<<endl;}
4.编写一个程序,要求用户以整数方式输入秒数(使用long或long long变量储存),然后以天、小时、分钟和秒的方式显示这段时间。使用符号常量来表示每天有多少小时、每小时有多少分钟以及每分钟有多少秒。
void cprimerplus_exercise3_7_4(){ const int second_to_minute = 60; // 1 minute = 60 seconds; const int minute_to_hour = 60; // 1 hour = 60 minutes const int hour_to_day = 24; // 1 day = 24 hours cout << "Enter the number of seconds:"; long seconds; cin >> seconds; int days, hours, minutes, second; days = seconds / (second_to_minute * minute_to_hour * hour_to_day); hours = (seconds % (second_to_minute * minute_to_hour * hour_to_day))/(second_to_minute * minute_to_hour); minutes = ((seconds % (second_to_minute * minute_to_hour * hour_to_day))%(second_to_minute * minute_to_hour)) / second_to_minute; second = ((seconds % (second_to_minute * minute_to_hour * hour_to_day))%(second_to_minute * minute_to_hour)) % second_to_minute; cout << seconds <<" seconds = "<< days << " days, " << hours <<" hours, " << minutes << " minutes, "<< second << " seconds"<< endl;}
5.编写一个程序,要求用户输入全球当前的人口和美国当前的人口(或其他国家的人口)。将这些信息存储在long long变量中,并让程序显示美国(或其他国家)的人口占全球人口的百分比。
void cprimerplus_exercise3_7_5(){ cout << "Enter the world‘s population:"; long long world_popu; cin >> world_popu; cout << "Enter the population of the US:"; long long us_popu; cin >> us_popu; double percentage; percentage = (us_popu * 100) / world_popu; cout << "The population of the US is " << percentage << "% of the world population!" << endl; //输出}
6.编写一个程序,要求用户输入驱车里程(英里)和使用汽油量(加仑),然后指出汽车耗油量为1加仑的里程。如果愿意,也可以让程序要求用户以公里为单位输入距离,并以升为单位输入汽油量,然后指出欧洲风格的结果—即每100公里的耗油量(升)。
void cprimerplus_exercise3_7_6(){ cout << "Enter your driven miles(miles):"; float miles; cin >> miles; cout << ‘\n‘ << "Enter your gallons of gasoline(gallons):"; float gallons; cin >> gallons; cout << ‘\n‘ << " your car got" << miles/gallons << "miles per gallon\n";}
7.编写一个程序,要求用户按欧洲的风格输入汽车的耗油量(每100公里消耗的汽油量(升)),然后将其转换为美国风格的耗油量---每加仑多少英里。注意:除了使用不同的单位计量外,美国方法(距离/燃料)与欧洲的方法(燃料/距离)相反。100公里 = 64.12英里,1加仑 = 3.875升。因此,19mpg大约和12.4l/100km,127mpg大约合8.7l/100km。
void cprimerplus_exercise3_7_7(){ const double km100_to_miles = 62.14; const double liters_per_galllon = 3.875; double euro_rating, us_rating; cout << "Enter fuel consumption in liters per 100km:" <<endl; cin >>euro_rating; us_rating = (km100_to_miles * liters_per_galllon)/euro_rating; cout << euro_rating << "liters pper 100km is" << us_rating << "miles per gallon.\n";}