BigInteger類modInverse()方法 (BigInteger Class modInverse() method)

• modInverse() method is available in java.math package.

  modInverse()方法在java.math包中可用。

• modInverse() method is used to calculate the mod inverse by using the inverse of (this BigInteger) mod the given BigInteger (val).

  modInverse()方法用于通過(guò)使用給定BigInteger(val)的(this BigInteger)mod的逆來(lái)計(jì)算mod逆。

• modInverse() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  modInverse()方法是一個(gè)非靜態(tài)方法，只能通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• modInverse() method may throw an exception at the time of returning mod inverse.

  在返回mod逆時(shí)， modInverse()方法可能會(huì)引發(fā)異常。

  ArithmeticException: This exception may throw when the given parameter holds value 0 or negative.

  ArithmeticException ：當(dāng)給定參數(shù)的值為0或負(fù)數(shù)時(shí)，可能引發(fā)此異常。

Syntax:

句法：

public BigInteger modInverse(BigInteger val);

Parameter(s):

參數(shù)：

• BigInteger val – represents the object by which to calculate mod inverse.

  BigInteger val –表示計(jì)算逆模的對(duì)象。

Return value:

返回值：

The return type of this method is BigInteger, it returns the mod inverse value by using [ inv (this BigInteger) mod (BigInteger val) ].

此方法的返回類型為BigInteger ，它通過(guò)使用[inv(this BigInteger)mod(BigInteger val)]返回mod逆值。

Example:

例：

// Java program to demonstrate the example // of BigInteger modInverse(BigInteger val) method of BigIntegerimport java.math.*;public class ModInverseOfBI {public static void main(String args[]) {// Initialize three variables str1 , str2 and str3String str1 = "101";String str2 = "13";String str3 = "10";// Initialize three BigInteger objects BigInteger b_int1 = new BigInteger(str1);BigInteger b_int2 = new BigInteger(str2);BigInteger b_int3 = new BigInteger(str3);// Display b_int1 , b_int2 and b_int3System.out.println("b_int1: " + b_int1);System.out.println("b_int2: " + b_int2);System.out.println("b_int3: " + b_int3);System.out.println();// Here, we are calculating modInverse between// two BigInteger values [inv(this BigInteger// b_int1) mod (BigInteger b_int3) ] by using// modInverse(BigInteger) methodBigInteger modinv_val = b_int1.modInverse(b_int3);System.out.println("b_int1.modInverse(b_int3): " + modinv_val);// Here, we are calculating modInverse between// two BigInteger values [inv(this BigInteger// b_int2) mod (BigInteger b_int3) ] by using// modInverse(BigInteger) methodmodinv_val = b_int2.modInverse(b_int3);System.out.println("b_int2.modInverse(b_int3): " + modinv_val);} }

Output

輸出量

b_int1: 101 b_int2: 13 b_int3: 10b_int1.modInverse(b_int3): 1 b_int2.modInverse(b_int3): 7

翻譯自: https://www.includehelp.com/java/biginteger-modinverse-method-with-example.aspx

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