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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,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。
#include <iostream>
using namespace std;
int main(void)
{
const int zhuan = 12;
cout << "Please enter your hight with inch:_____\b\b\b\b\b";
int inch;
cin >> inch;
int feet = inch / zhuan;
int inch1 = inch % zhuan;
cout << "Your hight is " << feet << " feet(s) and " << inch1 << " inch(s)." << endl;
return 0;
}
2.编写一个程序,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(一英尺为十二英寸),并将以英寸为单位的身高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。
#include <iostream>
using namespace std;
int main()
{
const double inch_pre_feet = 12,
mi_pre_inch = 0.0254,
kilo_pre_pun = 2.2;
cout << "Please enter your height of feet:___\b\b\b";
int feet;
cin >> feet;
cout << "Please enter your height of inch:___\b\b\b";
int inch;
cin >> inch;
cout << "Please enter your weight of pun:___\b\b\b";
int pun;
cin >> pun;
double height = (inch_pre_feet * feet + inch )* mi_pre_inch ;
double weight = kilo_pre_pun * pun;
double BMI = weight / (height * height);
cout << "Your BMI is " << BMI << 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分等于60秒,请以符号常量的方式表示这些值。对于每个输入值,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 degrees,minutes,and seconds:
First,enter the degrees:37
Next,enter the minutes of arc:51
Finally,enter the seconds of arc:19
37 degrees,51 minutes,19 seconds =37.8553 degrees
#include <iostream>
using namespace std;
int main()
{
const int TS = 24, SF = 60, FM = 60;
cout << "Enter the number of seconds: ";
long long seconds;
cin >> seconds;
int a = seconds / (TS * SF * FM);
int b = (seconds % (TS * SF * FM)) / (SF * FM);
int c = seconds % (SF * FM) / FM;
int d = seconds % FM;
cout << seconds << " seconds= " << a << " days, " << b << " hours, " << c << " minutes, " << d << " seconds";
return 0;
}
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变量存储),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。该程序的输出应与下面类似:
Enter the number of seconds:3160000
3160000 seconds = 365 days,17 hours,46 minutes,40 seconds
#include <iostream>
using namespace std;
const int Sec_per_min = 60;
const int Min_per_hour = 60;
const int Hour_per_day = 24;
int main()
{
cout << "Enter the number of seconds:";
long long total_sec;
cin >> total_sec;
int sec = total_sec%Sec_per_min;
int total_min = total_sec / Sec_per_min;
int min = total_min%Min_per_hour;
int total_hour = total_min / Min_per_hour;
int hour= total_hour%Hour_per_day;
int day = total_hour / Hour_per_day;
cout << total_sec << " seconds = " << day << " days," << hour << " hours," << min << " minutes," << sec << " seconds";
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.
#include <iostream>
using namespace std;
int main()
{
cout << "Enter the world's population: ";
long long WP;
cin >> WP;
cout << "Enter the population of the US: ";
long long UP;
cin >> UP;
double UP1 = UP, WP1 = WP;
double P = UP1 / WP1;
cout << "The population of the US is " << P*100 << "% of the world population.";
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)。
#include <iostream>
using namespace std;
int main()
{
const double a = 62.14, b = 3.875;
double P = 1 / (a * b);
cout << "Please enter the EU fuel-consumption:";
double c;
cin >> c;
cout << "It's " << c * P << " gal/mile";
return 0;
}
7.编写一个程序,要求每个用户按欧洲风格输入汽车的耗油量(每100公里消耗汽油量(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3.875升。因此,19mpg大约合12.41/100km,127mpg大约合8.71/100km。
#include <iostream>
using namespace std;
int main()
{
cout << "Please enter fuel consumption per 100 km(UN):";
double UN;
cin >> UN;
cout <<" Gallons per mile(US) : "<< 1 / UN*62.14*3.875;
system("pause");
return 0;
}
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