java math 类

数学班静态双层(双D) (Math Class static double floor(double d))

• This method is available in java.lang package.

  此方法在java.lang包中可用。

• In this method if the value of the given positive argument after decimal point is 0 or greater than 0 so in that case it returns the same number before decimal point else if the value of the given negative argument after decimal point is greater than 0 so it returns (the same number +1) before decimal point.

  在此方法中，如果给定的正参数的小数点后的值是0或大于0，那么在这种情况下，它在小数点前返回相同的数字，否则，如果给定的负参数的值后小数点后大于0，则它在小数点前返回(相同的数字+1)。

• This is a static method so this method is accessible with the class name too.

  这是一个静态方法，因此也可以使用类名访问此方法。

• The return type of this method is double that means it returns the greatest floating-point value of the given argument and the argument value may be less than or equal to the given argument.

  此方法的返回类型为double，这意味着它将返回给定参数的最大浮点值，并且参数值可能小于或等于给定参数。

• In this method, we pass only one parameter as an argument in the method of Math class.

  在此方法中，我们仅将一个参数作为参数传递给Math类的方法。

• This method does not throw any exception.

  此方法不会引发任何异常。

Syntax:

句法：

    public static double floor(double d){
}

Parameter(s):

参数：

double d – A double value whose greatest floating-poin value to be found.

double d-一个双精度值，其最大浮点值将被找到。

Note:

注意：

• If we pass "NaN", it returns "NaN".

  如果我们传递“ NaN”，则返回“ NaN”。

• If we pass a positive infinity, it returns the same i.e. a positive infinity.

  如果我们传递一个正无穷大，它将返回相同的值，即一个正无穷大。

• If we pass a negative infinity, it returns the same i.e. a negative infinity.

  如果我们传递一个负无穷大，它将返回相同的值，即一个负无穷大。

• If we pass 0 (-0 or 0), it returns the same.

  如果我们传递0(-0或0)，则返回相同值。

Return value:

返回值：

The return type of this method is double, it returns the greatest floating-point value of the given value.

此方法的返回类型为double ，它返回给定值的最大浮点值。

Java程序演示floor(double d)方法的示例 (Java program to demonstrate example of floor(double d) method)

// Java program to demonstrate the example of floor(double d)
// method of Math Class
public class FloorMethod {public static void main(String[] args) {// Here we are declaring few variables
double d1 = 7.0 / 0.0;
double d2 = -7.0 / 0.0;
double d3 = 0.0;
double d4 = -0.0;
double d5 = -123.1;
double d6 = 123.456;
// Display previous value of d1,d2,d3,d4,d5 and d6
System.out.println(" Before implementing floor() so the value of d1 is :" + d1);
System.out.println(" Before implementing floor() so the value of d2 is :" + d2);
System.out.println(" Before implementing floor() so the value of d3 is :" + d3);
System.out.println(" Before implementing floor() so the value of d4 is :" + d4);
System.out.println(" Before implementing floor() so the value of d4 is :" + d5);
System.out.println(" Before implementing floor() so the value of d4 is :" + d6);
// Here , we will get (Infinity) because we are passing parameter
// whose value is (infinity)
System.out.println("After implementing floor() so the value of d1 is :" + Math.floor(d1));
// Here , we will get (-Infinity) because we are passing parameter
// whose value is (-infinity)
System.out.println("After implementing floor() so the value of d2 is :" + Math.floor(d2));
// Here , we will get (0.0) because we are passing parameter
// whose value is (0.0)
System.out.println("After implementing floor() so the value of d3 is :" + Math.floor(d3));
// Here , we will get (-0.0) because we are passing parameter
// whose value is (-0.0)
System.out.println("After implementing floor() so the value of d4 is :" + Math.floor(d4));
// Here , we will get (-124.0) because we are passing parameter
// whose value is (-123.1)
System.out.println("After implementing floor() so the value of d5 is :" + Math.floor(d5));
// Here , we will get (123.0) because we are passing parameter
// whose value is (123.456)
System.out.println("After implementing floor() so the value of d6 is :" + Math.floor(d6));
}
}

Output

输出量

E:\Programs>javac FloorMethod.java
E:\Programs>java FloorMethod
Before implementing floor() so the value of d1 is :Infinity
Before implementing floor() so the value of d2 is :-Infinity
Before implementing floor() so the value of d3 is :0.0
Before implementing floor() so the value of d4 is :-0.0
Before implementing floor() so the value of d4 is :-123.1
Before implementing floor() so the value of d4 is :123.456
After implementing floor() so the value of d1 is :Infinity
After implementing floor() so the value of d2 is :-Infinity
After implementing floor() so the value of d3 is :0.0
After implementing floor() so the value of d4 is :-0.0
After implementing floor() so the value of d5 is :-124.0
After implementing floor() so the value of d6 is :123.0

翻译自: https://www.includehelp.com/java/math-class-static-double-floor-double-d-with-example.aspx

java math 类