Java中的 BigDecimal signum() 方法

Java.math.BigDecimal.signum()是Java中的一个内置方法，它返回这个 BigDecimal 的符号函数。符号函数或符号函数是提取实数符号的奇数数学函数。在数学表达式中，符号函数通常表示为 sgn。

句法：

public int signum()

参数：此方法不接受任何参数。

返回值：该方法可以返回三种类型的值：

• -1 如果这个 BigDecimal < 0
• 如果此 BigDecimal = 0，则为 0
• 1 如果此 BigDecimal > 0

下面的程序说明了上述方法的工作：

方案一：

// Program to demonstrate signum() method of BigDecimal 
  
import java.math.*;
  
public class Gfg {
  
    public static void main(String[] args)
    {
  
        BigDecimal b1 = new BigDecimal("12743");
        BigDecimal b2 = new BigDecimal("0");
        BigDecimal b3 = new BigDecimal("-4512");
  
        // Assigning the signum values of  BigDecimal objects b1, b2, b3
        // to  int objects i1, i2, i3 respectively
        int i1 = b1.signum();
        int i2 = b2.signum();
        int i3 = b3.signum();
  
        // Printing i1, i2, i3 values
        System.out.println("Signum function on " + b1 + " is " + i1);
        System.out.println("Signum function on " + b2 + " is " + i2);
        System.out.println("Signum function on " + b3 + " is " + i3);
    }
}

输出：

Signum function on 12743 is 1
Signum function on 0 is 0
Signum function on -4512 is -1

方案二：

// Program to demonstrate signum() method of BigDecimal 
  
import java.math.*;
  
public class Gfg {
  
    public static void main(String[] args)
    {
  
        BigDecimal b1 = new BigDecimal("17845452743");
        BigDecimal b2 = new BigDecimal("000");
        BigDecimal b3 = new BigDecimal("-444512");
  
        // Assigning the signum values of  BigDecimal objects b1, b2, b3
        // to  int objects i1, i2, i3 respectively
        int i1 = b1.signum();
        int i2 = b2.signum();
        int i3 = b3.signum();
  
        // Printing i1, i2, i3 values
        System.out.println("Signum function on " + b1 + " is " + i1);
        System.out.println("Signum function on " + b2 + " is " + i2);
        System.out.println("Signum function on " + b3 + " is " + i3);
    }
}

输出：

Signum function on 17845452743 is 1
Signum function on 0 is 0
Signum function on -444512 is -1

参考：https: Java/math/BigDecimal.html#signum()