设置给定数字的第K位

给定数字n和值k。从右边，在n的二进制表示形式中设置第k位。 LSB(或最后一位)的位置为0，倒数第二位为1，依此类推。同样，0 <= k 例子：

Input : n = 10, k = 2
Output : 14
(10)10 = (1010)2
Now, set the 2nd bit from right.
(14)10 = (1110)2
2nd bit has been set.

Input : n = 15, k = 3
Output : 15
3rd bit of 15 is already set.

要设置任何位，我们使用按位“或” |运算符。我们已经知道按位OR |运算符评估结果为1的每个比特，如果任何操作数的相应位被置(1)。为了设置数字的第k位，我们需要向左移动1 k次，然后对数字进行按位或运算，并在此之前执行左移结果。

In general, (1 << k) | n.

C++

// C++ implementation to set the kth bit
// of the given number
#include 
 
using namespace std;
 
// function to set the kth bit
int setKthBit(int n, int k)
{
    // kth bit of n is being set by this operation
    return ((1 << k) | n);
}
 
// Driver program to test above
int main()
{
    int n = 10, k = 2;
    cout << "Kth bit set number = "
         << setKthBit(n, k);
    return 0;
}

Java

// Java implementation to set the kth bit
// of the given number
 
class GFG {
     
// function to set the kth bit
static int setKthBit(int n, int k)
{
    // kth bit of n is being set by this operation
    return ((1 << k) | n);
}
 
// Driver code
public static void main(String arg[])
{
    int n = 10, k = 2;
    System.out.print("Kth bit set number = " +
                             setKthBit(n, k));
}
}
 
// This code is contributed by Anant Agarwal.

Python3

# Python implementation
# to set the kth bit
# of the given number
 
# function to set
# the kth bit
def setKthBit(n,k):
 
    # kth bit of n is being
    # set by this operation
    return ((1 << k) | n)
     
# Driver code
 
n = 10
k = 2
 
print("Kth bit set number = ",
          setKthBit(n, k))
 
# This code is contributed
# by Anant Agarwal.

C#

// C# implementation to set the
// kth bit of the given number
using System;
 
class GFG {
     
// function to set the kth bit
static int setKthBit(int n, int k)
{
    // kth bit of n is being set
    // by this operation
    return ((1 << k) | n);
}
 
// Driver code
public static void Main()
{
    int n = 10, k = 2;
    Console.Write("Kth bit set number = "
                    + setKthBit(n, k));
                    
}
}
 
// This code is contributed by
// Smitha Dinesh Semwal.

Javascript

    // Javascript implementation to set the
    // kth bit of the given number
     
    // function to set the kth bit
    function setKthBit(n, k)
    {
        // kth bit of n is being set
        // by this operation
        return ((1 << k) | n);
    }
     
    let n = 10, k = 2;
    document.write("Kth bit set number = " + setKthBit(n, k));
     
    // This code is contributed by rameshtravel07.

输出：

Kth bit set number = 14