第三章第二十题（科学：风寒温度）(Science: wind-chill temperature)
*3.20（科学：风寒温度）编程练习题2.17给出计算风寒温度的公式。这个公式适用于温度在华氏度-58度到41度之间。并且风速大于或等于2的情况。编写一个程序，提示用户输入一个温度值和一个风速值。如果输入值是合法的，那么显示风寒温度，否则显示一条消息，表明温度或风速是不合法数值。 *3.20(Science: wind-chill temperature)(Science: wind-chill temperature) Programming Exercise 2.17 gives a formula to compute the wind-chill temperature. The formula is valid for temperatures in the range between -58°F and 41°F and wind speed greater than or equal to 2. Write a program that prompts the user to enter a temperature and a wind speed. The program displays the wind-chill temperature if the input is valid; otherwise, it displays a message indicating whether the temperature and/or wind speed is invalid.参考代码：
package chapter03;
import java.util.Scanner;
public class Code_20 {
public static void main(String[] args){
double OutDoorTemperature,WindSpeed,WindChillIndex;
System.out.print("Enter the temperature in Fahrenheit"
+ " between -58 and 41 : ");
Scanner TemperInput = new Scanner(System.in);
OutDoorTemperature = TemperInput.nextDouble();
System.out.print("Enter the wind speed (>= 2) in miles per hour : ");
Scanner WindSpeedInput = new Scanner(System.in);
WindSpeed = WindSpeedInput.nextDouble();
if((OutDoorTemperature > -58 && OutDoorTemperature < 41) && WindSpeed >= 2)
{
WindChillIndex = 35.74 + 0.6215 * OutDoorTemperature
- 35.75 * Math.pow(WindSpeed,0.16)
+ 0.4275 * OutDoorTemperature
* Math.pow(WindSpeed,0.16);
System.out.println("The wind chill index is " + WindChillIndex);
}
else
System.out.println("The temperature and/or wind speed is invalid.");
TemperInput.close();
WindSpeedInput.close();
}
}
结果显示：
Enter the temperature in Fahrenheit between -58 and 41 : 30
Enter the wind speed (>= 2) in miles per hour : 5
The wind chill index is 24.72681669581838
Process finished with exit code 0
Processed:
0.025, SQL:
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