Java 中的 BigInteger setBit()方法
原文:https://www . geesforgeks . org/big integer-set bit-method-in-Java/
Java . math . BigInteger . setbit(index)方法返回一个大整数，该大整数的值相当于设置了指定位的这个大整数。该方法计算(此| (1 < < n))。大整数二进制表示的索引 n 处的位将被置位，意味着转换为 1。
语法:
public BigInteger setbit(int n)
参数:该方法取一个参数 n ，指需要设置的位的索引。
返回值:该方法在设置位位置 n 后返回 BigInteger 值。
异常:当 n 为负时，该方法可能会抛出算术异常。
示例 :
Input: value = 2300 index = 1
Output: 2302
Explanation:
Binary Representation of 2300 = 100011111100
bit at index 3 is 1 so set the bit at index 1
Now Binary Representation becomes 100011111110
and Decimal equivalent of 100011111110 is 2302
Input: value = 5482549 index = 1
Output: 5482551
下面的程序说明了 BigInteger 的 setBit(索引)方法:
// Program to demonstrate setBit() method of BigInteger
import java.math.*;
public class GFG {
public static void main(String[] args)
{
// Creating BigInteger object
BigInteger biginteger = new BigInteger("2300");
// Creating an integer i for index
int i = 1;
// Calling setBit() method on bigInteger at index i
// store the return BigInteger
BigInteger changedvalue = biginteger.setBit(i);
String result = "After applying setBit at index " +
i + " of " + biginteger+ " New Value is " + changedvalue;
// Displaying the result
System.out.println(result);
}
}
输出:
After applying setBit at index 1 of 2300 New Value is 2302
参考:https://docs . Oracle . com/javae/7/docs/API/Java/math/big integer . html # set bit(int)
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