C/C++ 左移<<, 右移>>的作用及说明

/* C++ Program to demonstrate use of left shift  
   operator */
#include<stdio.h> 
int main() 
{ 
    // a = 5(00000101), b = 9(00001001) 
    unsigned char a = 5, b = 9;  
  
    // The result is 00001010  
    printf("a<<1 = %d\n", a<<1); 
    
    // The result is 00010010  
    printf("b<<1 = %d\n", b<<1);   
    return 0; 
} 

/* C++ Program to demonstrate use of right 
   shift operator */
#include<stdio.h> 
  
using namespace std; 
int main() 
{ 
    // a = 5(00000101), b = 9(00001001) 
    unsigned char a = 5, b = 9;  
  
    // The result is 00000010  
       
    printf("a>>1 = %d\n", a>>1); 
    
    // The result is 00000100 
    printf("b>>1 = %d\n", b>>1);   
    return 0; 
}

#include<stdio.h> 
int main() 
{  
   int i = 3;   
   printf("pow(2, %d) = %d\n", i, 1 << i); 
   i = 4;   
   printf("pow(2, %d) = %d\n", i, 1 << i); 
   return 0; 
}

int main() {
 
	long v[2] = {0,0};
	long u1 = 1;
	long u2 = (u1 <<33);
	v[1] |= (u1<<33);
	LOG(sizeof(long))
	cout << u1 <<"," <<u2<< "," << v[1]<< endl;
	std::cin.get();
}

#include<iostream>
#include<vector>
#include<unordered_map>
using namespace std;
#define LOG(x) std::cout<<x<<std::endl;
 
int main() {
 
	long v[2] = {0,0};
	long u1 =3;
	long u2 = (u1 >>1);
	v[1] |= (u1>>1);
	LOG(sizeof(long))
	cout << u1 <<"," <<u2<< "," << v[1]<< endl;
	std::cin.get();
}