C++ 左移 << 和 右移 >>

先看例子:

#include <iostream>

using namespace std;

int main() {
    int num = 32;
    
    int half = num >> 1;
    int quarter = num >> 2;
    int doublenum = num << 1;
    int quadruple = num << 2;
    
    cout << "half = " << half << endl;
    cout << "quarter = " << quarter << endl;
    cout << "doublenum = " << doublenum << endl;
    cout << "quadruple = " << quadruple << endl;
    
    return 0;
}
half = 16
quarter = 8
doublenum = 64
quadruple = 128
 

按位右移

数字为32=25,二进制为10000,右移一位为01000(左侧补零),即$2^4=16$。右移二位为00100,即$2^3=8$。

按位左移

右移一位为100000(右侧补零),即$2^6=64$。右移二位为1000000,即$2^7=128$。

注意:

不能出现cout<< 2>>1 <<endl; 必须得打上括号 cout<< (2>>1) <<endl; 因为>>和<<运算级是一样的,并且这里是输入输出运算符,编译器会无法识别。

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转载自www.cnblogs.com/KresnikShi/p/10747276.html
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