yanhui2012的专栏

TCPL Excercise 2-9//a faster version of bitcount //x &= (x-1) deletes the rightmost 1-bit in x int bitcount(unsigned int x) { int b; for (b = 0; x != 0; x &= (x-1)) if (x > 0)

前些天，碰到一个在考博同学问到c++宏定义中传i++表达式参数的问题，虽然觉得这类问题其实没什么意义，但无奈考博题目要考，只好研究了下。 题目是#include <stdio.h> #include <stdlib.h> #define product(x) ((x)*(x))int main() { int i=3,j,k; j = product(i++); k = p

lua快速入门

require "luasql.mysql"--initial env = luasql.mysql()--connect db db="testdb" username="test" password="test" ip="127.0.0.1" port="3306" conn = env:connect(db,username,password,ip,port)--set encode conn