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分享#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
#include <windows.h>
#include <io.h>
#else
#include <unistd.h>
#include <sys/time.h>
#include <pthread.h>
#define CRITICAL_SECTION pthread_mutex_t
#define _vsnprintf vsnprintf
#endif
//Log{
#define MAXLOGSIZE 20000000
#define MAXLINSIZE 16000
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char logfilename1[]="MyLog1.log";
char logfilename2[]="MyLog2.log";
static char logstr[MAXLINSIZE+1];
char datestr[16];
char timestr[16];
char mss[4];
CRITICAL_SECTION cs_log;
FILE *flog;
#ifdef WIN32
void Lock(CRITICAL_SECTION *l) {
EnterCriticalSection(l);
}
void Unlock(CRITICAL_SECTION *l) {
LeaveCriticalSection(l);
}
#else
void Lock(CRITICAL_SECTION *l) {
pthread_mutex_lock(l);
}
void Unlock(CRITICAL_SECTION *l) {
pthread_mutex_unlock(l);
}
#endif
void LogV(const char *pszFmt,va_list argp) {
struct tm *now;
struct timeb tb;
if (NULL==pszFmt||0==pszFmt[0]) return;
_vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);
ftime(&tb);
now=localtime(&tb.time);
sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);
sprintf(timestr,"%02d:%02d:%02d",now->tm_hour ,now->tm_min ,now->tm_sec );
sprintf(mss,"%03d",tb.millitm);
printf("%s %s.%s %s",datestr,timestr,mss,logstr);
flog=fopen(logfilename1,"a");
if (NULL!=flog) {
fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);
if (ftell(flog)>MAXLOGSIZE) {
fclose(flog);
if (rename(logfilename1,logfilename2)) {
remove(logfilename2);
rename(logfilename1,logfilename2);
}
} else {
fclose(flog);
}
}
}
void Log(const char *pszFmt,...) {
va_list argp;
Lock(&cs_log);
va_start(argp,pszFmt);
LogV(pszFmt,argp);
va_end(argp);
Unlock(&cs_log);
}
//Log}
int main(int argc,char * argv[]) {
int i;
#ifdef WIN32
InitializeCriticalSection(&cs_log);
#else
pthread_mutex_init(&cs_log,NULL);
#endif
for (i=0;i<10000;i++) {
Log("This is a Log %04d from FILE:%s LINE:%d\n",i, __FILE__, __LINE__);
}
#ifdef WIN32
DeleteCriticalSection(&cs_log);
#else
pthread_mutex_destroy(&cs_log);
#endif
return 0;
}
//1-78行添加到你带main的.c或.cpp的那个文件的最前面
//81-85行添加到你的main函数开头
//89-93行添加到你的main函数结束前
//在要写LOG的地方仿照第87行的写法写LOG到文件MyLog1.log中
#include<stdio.h>
#include<math.h>
#define E 0.00001
typedef struct {
double x;
double y;
}point;
typedef struct{
point p1;
point p2;
}center;
double distance(point a,point b);
center cluster(point* p,int i);
point cen(point* p,int i,int t);
center part(point* p,int i,point p1,point p2);
int main()
{
point arr[4]={{1,2},{2,4},{2,7},{3,8}};
center c=cluster(arr,4);
printf("%f,%f\n%f,%f",c.p1.x ,c.p1.y,c.p2.x,c.p2.y);
return 0;
}
center cluster(point* p,int i)
{
point a, b,a0,b0;
int n=(i*(i-1))/2;
double max=0;
int x=0;
double d[n];
double e1,e2;
center c0;
for(int m=0;m<i-1;m++)
for(int n=1;n<i;n++)
{
d[x]=distance(p[m],p[n]);
if(d[x]>max)
{
max=d[x];
a=p[m];// 把距离最远的点付给a,b
b=p[n];
}
x++;
}
do
{
a0=a;
b0=b;
c0=part(p,i,a,b);
a=c0.p1 ;
b=c0.p2;
e1=distance(a0,a);
e2=distance(b0,b);
}while((e1>E)|(e2>E));
center c={a,b};
return c;
}
//求两点之间距离函数
double distance(point a,point b)
{
double dte;
dte=sqrt((b.x-a.x)*(b.x-a.x)+(b.y-a.y)*(b.y-a.y));
return dte;
}
//聚为两类
center part(point* p,int i,point p1,point p2)
{
point arr1[i];
point arr2[i];
int t1=0;
int t2=0;
for(int n=0;n<i;n++)
{
if(distance(p1,p[n]) < distance(p2,p[n]))
{
arr1[n]=p[n];
t1++;
}
else
{
arr2[n]=p[n];
t2++;
}
}
p1=cen(arr1,i,t1);
p2=cen(arr2,i,t2);
center c={p1,p2};
return c;
}
//求中心点函数
point cen(point* p,int i,int t)
{
point pt;
double X=0;
double Y=0;
for(int n=0;n<i;n++)
{
X+=p[n].x;
Y+=p[n].y;
}
pt.x =X/t;
pt.y =Y/t;
return pt;
}