java.math.BigInteger.signum() 返回此BigInteger的函數正負號。

聲明

以下是java.math.BigInteger.signum()方法的聲明

public int signum()

參數

• NA

返回值

此方法返回-1，0或1作為此BigInteger的值對應是負，零或正數。

異常

• NA

例子

下麵的例子顯示math.BigInteger.signum()方法的用法

package com.yiibai;

import java.math.*;

public class BigIntegerDemo {

public static void main(String[] args) {

	// create 3 BigInteger objects
	BigInteger bi1, bi2, bi3;

	// create 3 int objects
	int i1, i2, i3;

	bi1 = new BigInteger("0");
	bi2 = new BigInteger("10");
	bi3 = new BigInteger("-10");

	// assign signum results of bi1, bi2, bi3 to i1, i2, i3
	i1 = bi1.signum();
	i2 = bi2.signum();
	i3 = bi3.signum();

	String str1 = "Signum function returns " + i1 + " for " +bi1;
	String str2 = "Signum function returns " + i2 + " for " +bi2;
	String str3 = "Signum function returns " + i3 + " for " +bi3;

	// print i1, i2, i3 values
	System.out.println( str1 );
	System.out.println( str2 );
	System.out.println( str3 );
   }
}

讓我們編譯和運行上麵的程序，這將產生以下結果：

Signum function returns 0 for 0
Signum function returns 1 for 10
Signum function returns -1 for -10