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。
注:1英尺=12英寸。
#include<iostream>
using namespace std;
const int Factor = 12;
int main() {
int height;
cout << "Please enter the height (in inches):___\b\b\b ";
cin >> height;
cout << "Your height is " << height / 12 << " inches " <<
height % 12 << " feets." << endl;
system("pause");
return 0;
}
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(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;
const int Feet_inches = 12;
const float Inches_meter = 0.0254;
const float Kg_pound = 2.2;
int main() {
float feets, inches, pounds;
cout << "Please enter your height(feets and inches):";
cin >> feets >> inches;
cout << "Please enter your weight(pounds): ";
cin >> pounds;
float total_inches, meter, kg, BMI;
total_inches = feets * Feet_inches + inches;
meter = total_inches * Inches_meter;
kg = pounds * Kg_pound;
BMI = kg / (meter * meter);
cout << "Your BMI is " << BMI << endl;
system("pause");
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 , 51minutes , 19 seconds = 37.8553 degrees
#include<iostream>
using namespace std;
const int Deg_min = 60;
const int Min_sec = 60;
int main() {
cout << "Enter a latitude in degrees, minutes, and seconds:\n";
float degrees, minutes, seconds;
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 << " seconds = "
<< (degrees + minutes / Deg_min + seconds / Min_sec / Deg_min) << " degrees\n";
system("pause");
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、每小时有多少分钟一集每分钟有多少秒。该程序的输出应与下列类似:
Enter the number of seconds: 31600000
31600000 seconds = 365 days, 17 hours , 46 minutes , 40 seconds
#include<iostream>
using namespace std;
const int DAY_TO_HOUR = 24;
const int HOUR_TO_MINUTES = 60;
const int MINUTES_TO_SECONDS = 60;
int main() {
long number;
cout << "Enter the number of seconds: ";
cin >> number;
int days, hours, minutes, seconds;
int number_remain;
days = number / (MINUTES_TO_SECONDS * HOUR_TO_MINUTES * DAY_TO_HOUR);
number_remain = number % (MINUTES_TO_SECONDS * HOUR_TO_MINUTES * DAY_TO_HOUR);
hours = number_remain / (HOUR_TO_MINUTES * MINUTES_TO_SECONDS);
number_remain = number_remain % (HOUR_TO_MINUTES * MINUTES_TO_SECONDS);
minutes = number_remain / (MINUTES_TO_SECONDS);
seconds = number_remain % (MINUTES_TO_SECONDS);
cout << number << " seconds = " << days << " days, " << hours <<
" hours, " << minutes << " minutes, " << seconds << " secondes\n";
system("pause");
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.
#include<iostream>
using namespace std;
int main() {
long long world, us;
cout << "Enter the world's population: ";
cin >> world;
cout << "Enter the population of the US: ";
cin >> us;
cout << "The population of the US is " << (double(us) / double(world) * 100)
<< "% of the world population.\n";
system("pause");
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() {
float miles, gallons;
cout << "Please enter the distance(mile): ";
cin >> miles;
cout << "Please enter the gasoline amount(gallon): ";
cin >> gallons;
cout << "Wasting a gallon gasoline run " << miles / gallons << " miles.\n";
int number;
cout << "Do you want to know how much oil is consumed per 100 kilometers?"
" if you want, please enter 1: ";
cin >> number;
if (number == 1) {
float kilometers, liter;
cout << "Please enter the distance(kilometer):";
cin >> kilometers;
cout << "Please enter the gasoline amount(liter):";
cin >> liter;
cout << "Wasting gasoline per 100 kilometers is " << liter / kilometers * 100
<< " liters." << endl;
}
system("pause");
return 0;
}
7. 编写一个程序,要求用户按欧洲风格输入汽车的耗油量(每100公里消耗的汽油(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, 27mpg大约合8.71/100km。
注:该处127mpg大约合8.71/100km有问题,而是27mpg大约合8.71/100km。
#include<iostream>
using namespace std;
const float KILO100_TO_MILE = 62.14;
const float GALLON_TO_LITER = 3.875;
int main() {
float european;
cout << "Please enter European style fuel consumption: ";
cin >> european;
float gallon, miles;
gallon = european / GALLON_TO_LITER;
miles = KILO100_TO_MILE;
cout << miles / gallon << " mpg = " << european << "l/100km.\n";
system("pause");
return 0;
}