1.编写一个程序，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寸和英尺）。该程序使用下划线字符来指示输入位置。另外，使用一个const符号来表示转换因子。
自己写的
#include<iostream>
using namespace std;
int main() {
const int ft_per_in = 12;
int in;
cout << "Enter your height in inches:";
cin >> in;
int foot = in / ft_per_in;
int link = in % ft_per_in;
cout << in << " inches are " << foot << " foot, " << inch << " link(s).\n";
system("pause");
return 0;
}
网上的参考
#include<iostream>
using namespace std;
int main()
{
const int INCH_PER_FEET = 12;
int height;
cout << "Please enter your height in inch: ___\b\b\b";
cin >> height;
cout << "Your height is " << height / INCH_PER_FEET << " feet and ";
cout << height % INCH_PER_FEET << " inches." << endl;
return 0;
}
2.编写一个程序，要求以几英寸几英尺的方式输入身高，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(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英尺 = 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（1千克= 2.2磅）。最后，计算相应的BMI–体重（千克）除以身高（米）的平方。用符号常量表示各种转换因子。
自己写的
#include<iostream>
using namespace std;
int main() {
const int ft_per_in = 12;
cout << "Enter your height in XXfeet XXinch(es):" << endl;
double ft;
double in;
cout << "feet:";
cin >> ft;
cout << "inch(es)";
cin >> in;
cout << "Your height is:" << ft << " foot(s)," << in << " inch(es)" << endl;
double height = (ft * ft_per_in + in) * 0.0254;
cout << "Your height is:" << height << "m" << endl;
const double kg_per_ig = 2.2;
cout << "Enter your weight in pounds:";
double pounds;
cin >> pounds;
cout << "Your weight is:" << pounds <<" pounds"<< endl;
double weight = pounds / kg_per_ig;
cout << "Your weight is:"<< weight << "kg" << endl;
double BMI = weight / (height * height);
cout << "BMI = " << BMI << endl;
system("pause");
return 0;
}
网上的参考1
#include <iostream>
const int FOOT_TO_INCH = 12;
const float INCH_TO_METER = 0.0254;
const double KILLOGRAM_TO_POUND = 2.2;
int main(void)
{
using namespace std;
int height_foot, height_inch;
double weight_pound, height, weight, bmi;
cout << "Please enter your height foot: ";
cin >> height_foot;
cout << "Please enter your height inch:";
cin >> height_inch;
cout << "Please enter your weight in pounds:";
cin >> weight_pound;
height = (height_foot * FOOT_TO_INCH + height_inch) * INCH_TO_METER;
weight = weight_pound / KILLOGRAM_TO_POUND;
bmi = weight / (height * height);
cout << "Your bmi is " << bmi << endl;
return 0;
}
网上的参考2
#include <iostream>
using namespace std;
int main()
{
const int INCH_PER_FEET = 12; //1英尺为12英寸;
const double POUND_PER_KG = 2.2; //1千克为2.2磅;
const double METER_PER_INCH = 0.0254; //1英寸为0.0254米;
double height_feet, height_inch, weight, meter;
cout << "Please enter your height in feet and inch: ";
cin >> height_feet >> height_inch;
cout << "Please enter your weight in pound: ";
cin >> weight;
cout << "Your height is " << height_feet * INCH_PER_FEET + height_inch << " inches." << endl;
meter = (height_feet * INCH_PER_FEET + height_inch) * METER_PER_INCH;
cout << "Your BMI is " << (weight / POUND_PER_KG) / (meter * meter) << "." << endl;
return 0;
}
3.编写一个程序，要求用户以度分秒的方式输入一个纬度，然后以度为单位显示该纬度。1度为60分，1分为60秒，请以符号常量的方式表示这些值。对于每个输入量，应使用一个独立的变量存储它。下面是该程序运行时的情况：
Enter a latitude in degree ,minutes,and seconds;
First,enter the degree:37
Next,enter the minutes of arc:51
Finally,enter the seconds of arc:19
37 degree,51 minutes,19 seconds = 37.8553 degrees
自己写的
#include <iostream>
const int DEGREE_TO_MINUTE = 60;
const int DEGREE_TO_SECOND = 3600;
int main(void)
{
using namespace std;
int degree, minute, second;
double degree_style;
cout << "Enter a latitude in degrees,minutes,and seconds" << endl;
cout << "First，enter the degree: ";
cin >> degree;
cout << "Next,enter the minutes of arc:";
cin >> minute;
cout << "Finally,enter the seconds of arc:";
cin >> second;
degree_style = degree + (float)minute / DEGREE_TO_MINUTE + (double)second / DEGREE_TO_SECOND;
cout << degree << "degrees," << minute << " minutes, " << second << " seconds =" << degree_style << " degrees" << endl;
return 0;
}
网上的参考
#include <iostream>
using namespace std;
int main()
{
const double MINUTE_PER_DEGREE = 60.0;
const double SECOND_PER_MINUTE = 60.0;
double degree, minute, second, total;
cout << "Enter a latitude in degrees, minutes, and seconds:" << endl;
cout << "First, enter the degrees: ";
cin >> degree;
cout << "Next, enter the minutes of arc: ";
cin >> minute;
cout << "Finally, enter the seconds of arc: ";
cin >> second;
total = degree + (minute / MINUTE_PER_DEGREE) + (second / (MINUTE_PER_DEGREE * SECOND_PER_MINUTE));
cout << degree << " degrees, ";
cout << minute << " minutes, ";
cout << second << " seconds = ";
cout << total << " degrees" << endl;
return 0;
}
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。该程序的输出应与下面类似：
Enter the world’s population :6898758899
Enter the population of the US:310783781
The population of the us is 4.50492% of the world population
自己写的
#include <iostream>
using namespace std;
int main() {
float World_Population, Amercian_Population, Percentage;
cout << "Enter the world's population:";
cin >> World_Population;
cout << "Enter the population of the U.S.:";
cin >> Amercian_Population;
Percentage = (Amercian_Population / World_Population);
cout << Percentage << endl;
cout << "The population of the us is " << Percentage * 100
<< "% of the world population." << endl;
system("pause");
return 0;
}
网上的参考
#include <iostream>
using namespace std;
int main()
{
long long world_population;
long long china_population;
cout << "Enter the world's population: ";
cin >> world_population;
cout << "Enter the population of the China: ";
cin >> china_population;
cout << "The population of the China is ";
cout << double(china_population) / world_population * 100LL;
cout << "% of the world population." << endl;
return 0;
}
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一加仑的里程。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）
自己写的
#include <iostream>
using namespace std;
int main() {
long long yingli, jialun;
cout << "Enter the yinli:";
cin >> yingli;
cout << "Enter the jialun:";
cin >> jialun;
double meijialunlicheng =(double)yingli / jialun;
cout << "The haoyouliang is " << meijialunlicheng*100 << endl;
system("pause");
return 0;
}
网上的参考
#include <iostream>
using namespace std;
int main()
{
**加粗样式** double kilometer, liter;
cout << "Please enter your driving distance(km): ";
cin >> kilometer;
cout << "Please enter your gas consumption(liter): ";
cin >> liter;
cout << "You consume " << liter / kilometer * 100;
cout << " liter gas for driving per 100 km." << endl;
return 0;
}
7.编写一个程序，要求用户按欧洲分割输入汽车的耗油量（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）与欧洲方法（燃料/距离）相反。100公里等于62.14英里，1加仑等于3.785升。因此，19mpg大约合12.4l/100km,27mpg大约合8.71/100km。
自己写的
#include <iostream>
using namespace std;
int main()
{
double kilometer, liter, mile, gallon;
const double kilometer_per_mile = 0.6214;
const double gallon_per_liter = 3.785;
cout << "每100公里消耗的汽油量（升）：" << endl;
cin >> liter;
gallon = liter / gallon_per_liter;
mile = 100 * kilometer_per_mile;
cout << "每加仑可以跑" << mile / gallon << "英里" << endl;
system("pause");
return 0;
}
网上的参考
#include <iostream>
using namespace std;
int main()
{
const double MILE_PER_KM = 0.6214; //1公里是0.6214英里;
const double LITER_PER_GALLON = 3.875; //1加仑是3.875升;
double kilometer, liter;
cout << "Please enter your driving distance(km): ";
cin >> kilometer;
cout << "Please enter your gas consumption(liter): ";
cin >> liter;
cout << "You consume " << liter / kilometer * 100;
cout << " liter gas for driving per 100 km (European style)." << endl;
cout << "You drive " << kilometer * MILE_PER_KM / liter * LITER_PER_GALLON;
cout << " miles for per gallon (American style)." << endl;
return 0;
}
