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缘由：

总结、提高需要

正文：

参考解答：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*
i = 0
i << 2 = 0
i = 1
i << 2 = 4

1 << 1 = 2
1 << 2 = 4
1 << 3 = 8
*/

int main(int argc, char const *argv[])
{
	int i = 0;
	printf("i = %d\n", i);
	i = i << 2;
	printf("i << 2 = %d\n", i);
	
	i = 1;
	printf("i = %d\n", i);
	i = i << 2;
	printf("i << 2 = %d\n\n", i);

	for (i = 0; i < 3; ++i) {
		printf("1 << %d = %d\n", i+1, 1 << (i+1));
	}

	return 0;
}

参考链接：

Linux C/C++ 运算符：种类、优先级、结合性 #nice
http://blog.csdn.net/guowenyan001/article/details/45049347
http://www.slyar.com/blog/c-operator-priority.html

来谈谈C++ 位运算 & | << >> ^ ~ %
http://www.linuxidc.com/Linux/2014-03/98362.htm

C/C++刁钻问题各个击破-位运算及其应用实例(1) #nice
http://www.linuxidc.com/Linux/2012-01/52082p3.htm

C/C++刁钻问题各个击破
http://blog.csdn.net/w57w57w57/article/category/851799

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