第六章第八题(摄氏度和华氏度之间的转换)(Conversions between celsius and fahrenheit)
- 6.8(摄氏度和华氏度之间的转换)编写一个类,包含下面两个方法:
public static double celsiusToFahrenheit(double celsius)
public static double fahrenheitToCelsius(double fahrenheit)
转换公式如下:
华氏度 = (9.0 / 5)* 摄氏度 + 32
摄氏度 = (5.0 / 9)* (华氏度 - 32)
编写一个测试程序,调用这个两个方法来显示如下表格:
摄氏度 华氏度 华氏度 摄氏度
40.0 104.0 120.0 48.89
39.0 102.2 110.0 43.33
…
32.0 89.6 40.0 4.44
31.0 87.8 30.0 -1.11
6.8(Conversions between celsius and fahrenheit)Write a class that contains the following two methods:
public static double celsiusToFahrenheit(double celsius)
public static double fahrenheitToCelsius(double fahrenheit)
The formula for the conversion is:
fahrenheit = (9.0 / 5)* celsius + 32
celsius = (5.0 / 9)* (fahrenheit - 32)
Write a test program that invokes these methods to display the following tables:
celsius fahrenheit fahrenheit celsius
40.0 104.0 120.0 48.89
39.0 102.2 110.0 43.33
…
32.0 89.6 40.0 4.44
31.0 87.8 30.0 -1.11 - 参考代码:
package chapter06;
public class Code_08 {
public static void main(String[] args) {
printTableHead();
for(double c = 40,f = 120;c >= 31 && f >= 30;c -= 1,f -= 10)
System.out.printf("%.1f\t\t%.1f\t\t\t%.1f\t\t%.2f\n", c, Conversion.celsiusToFahrenheit(c), f, Conversion.fahrenheitToCelsius(f));
}
public static void printTableHead() {
System.out.println("Celsius\t\tFahrenheit\t\tFahrenheit\tCelsius");
System.out.println("-----------------------------------------------------------------");
}
}
class Conversion{
public static double celsiusToFahrenheit(double celsius) {
return (9.0 / 5) * celsius + 32;
}
public static double fahrenheitToCelsius(double fahrenheit) {
return (5.0 / 9) * (fahrenheit - 32);
}
}
- 结果显示:
Celsius Fahrenheit Fahrenheit Celsius
-----------------------------------------------------------------
40.0 104.0 120.0 48.89
39.0 102.2 110.0 43.33
38.0 100.4 100.0 37.78
37.0 98.6 90.0 32.22
36.0 96.8 80.0 26.67
35.0 95.0 70.0 21.11
34.0 93.2 60.0 15.56
33.0 91.4 50.0 10.00
32.0 89.6 40.0 4.44
31.0 87.8 30.0 -1.11
Process finished with exit code 0
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