使用按位运算符
将任意数字乘以 4
原文:https://www . geeksforgeeks . org/乘法-number-4-use-bitwise-operator/
我们是一个数字 n，我们的任务是使用逐位运算符将数字乘以 4。 示例:
Input : 4
Output :16
Input :5
Output :20
解释情况 1:-n = 4 4 的二进制数是 100，现在向右移动两位，然后是 10000，现在数字是 16 乘以 44=16 ans。 接近* :- (n < < 2)向右移动两位
C++
// C++ program to multiply a number with
// 4 using Bitwise Operator
#include <bits/stdc++.h>
using namespace std;
// function the return multiply a number
// with 4 using bitwise operator
int multiplyWith4(int n)
{
// returning a number with multiply
// with 4 using2 bit shifring right
return (n << 2);
}
// derive function
int main()
{
int n = 4;
cout << multiplyWith4(n) << endl;
return 0;
}
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to multiply a number
// with 4 using Bitwise Operator
class GFG {
// function the return
// multiply a number
// with 4 using bitwise
// operator
static int multiplyWith4(int n)
{
// returning a number
// with multiply with
// 4 using 2 bit shifting
// right
return (n << 2);
}
// Driver Code
public static void main(String[] args)
{
int n = 4;
System.out.print(multiplyWith4(n));
}
}
// This code is contributed by Smitha.
Python 3
# Python 3 program to multiply
# a number with 4 using Bitwise
# Operator
# function the return multiply
# a number with 4 using bitwise
# operator
def multiplyWith4(n):
# returning a number with
# multiply with 4 using2
# bit shifring right
return (n << 2)
# derive function
n = 4
print(multiplyWith4(n))
# This code is contributed
# by Smitha
C
// C# program to multiply a number
// with 4 using Bitwise Operator
using System;
class GFG {
// function the return
// multiply a number
// with 4 using bitwise
// operator
static int multiplyWith4(int n)
{
// returning a number
// with multiply with
// 4 using 2 bit shifting
// right
return (n << 2);
}
// Driver Code
public static void Main(String[] args)
{
int n = 4;
Console.Write(multiplyWith4(n));
}
}
// This code is contributed by Smitha.
服务器端编程语言（Professional Hypertext Preprocessor 的缩写）
<?php
// PHP program to multiply
// a number with 4 using
// Bitwise Operator
// function the return
// multiply a number
// with 4 using bitwise
// operator
function multiplyWith4($n)
{
// returning a number
// with multiply with
// 4 using2 bit
// shifting right
return ($n << 2);
}
// Driver Code
$n = 4;
echo multiplyWith4($n),"\n";
// This code is contributed by Ajit.
?>
java 描述语言
<script>
// javascript program to multiply a number
// with 4 using Bitwise Operator
// function the return
// multiply a number
// with 4 using bitwise
// operator
function multiplyWith4(n)
{
// returning a number
// with multiply with
// 4 using 2 bit shifting
// right
return (n << 2);
}
// Driver Code
var n = 4;
document.write(multiplyWith4(n));
// This code is contributed by Amit Katiyar
</script>
输出:-
16
推广:一般来说，我们可以使用按位运算符乘以 2 的幂。例如，假设我们希望与 16 相乘(这是 2 4 ，我们可以通过向左移动 4 来实现。
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