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bool flag;   if(flag)£¬if(!flag)
char *p;   if(p==NULL)£¬if(p!=NULL)
float x;  
const float EPSILON = 1e-6;
if((x>=-EPSILON)&&(x<=EPSILON)) //(-0.000001~0.000001)
if((x<-EPSILON)&&(x>EPSILON)) //(+INFINITE~0.000001),(-0.000001~-INFINITE)
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double d = 100.25;
int x = d;
int *pInt = (int*)&d;
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cout<< x <<endl;
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#define INTERVAL 1  ¶¨ÒåºêµÄʱ¼ä¼ä¸ôΪ1Ãë
//
void On_Time()  //ÿһÃ뼤·¢µÄʼþ
{
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}
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