C/C++ÊÔÌâ
1¡¢bool¡¢float¡¢Ö¸Õë±äÁ¿Óë"ÁãÖµ"±È½ÏµÄifÓï¾ä£¿
´ð£º
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)
2¡¢constÓÐʲôÓÃ;£¿
´ð£º
£¨1£©¿ÉÒÔ¶¨Òåconst ³£Á¿
£¨2£©const ¿ÉÒÔÐÞÊκ¯ÊýµÄ²ÎÊý¡¢·µ»ØÖµ¼°º¯ÊýµÄ¶¨ÒåÌå¡£±»constÐÞÊεĶ«Î÷¶¼Êܵ½Ç¿ÖƱ£»¤£¬¿ÉÒÔÔ¤·ÀÒâÍâµØ±»Ð޸ģ¬ÄÜÌá¸ß³ÌÐòµÄ½¡×³ÐÔ¡£
3¡¢ÔÚC++³ÌÐòÖе÷Óñ»C±àÒëÆ÷±àÒëºóµÄº¯Êý£¬ÎªÊ²Ã´¶¼Òª¼Óextern "C" ?
´ð£º
C++ÓïÑÔÖ§³Öº¯ÊýÖØÔØ£¬CÓïÑÔ²»Ö§³Öº¯ÊýÖØÔØ¡£º¯Êý±»C++±àÒëÆ÷±àÒëºÍ±»C±àÒëÆ÷±àÒëºóÉú³ÉµÄÄÚ²¿Ãû×ÖÊDz»Í¬µÄ¡£¼ÙÉèij¸öº¯ÊýµÄÔÐÍΪ£ºvoid foo(int x,int y);¸Ãº¯Êý±»C±àÒëÆ÷±àÒëºóµÄÄÚ²¿Ãû×ÖΪ_foo£¬ÃæC++±àÒëÆ÷Ôò»á²úÉúÏñ_foo_int_intÖ®ÀàµÄÃû×Ö¡£C++ÌṩÁËCÁ¬½Ó½»»»Ö¸¶¨·ûºÅ extern "C" À´½â¾öÃû×ÖÆ¥ÅäµÄÎÊÌâ¡£
4¡¢ÀàÐÍת»»£º
double d = 100.25;
int x = d;
int *pInt = (int*)&d;
ÇëÎÊÒÔÏÂÁ½¸öÓï¾äÊä³öʲô£¿
cout<< x <<endl;
cout<< *pInt <<endl;
´ð£º
µÚÒ»¸öÊä³ö 100£¬xÈ¡dµÄÕûÊý²¿·Ö¡£
µÚ¶þ¸ö½á¹û²»ÊÇ100£¬*pIntµÈÓÚdµÄǰ4¸ö×Ö½ÚµÄÊýÖµ£¬¶ø²»ÊÇdµÄÕûÊý²¿·Ö¡£
Ïà¹ØÎĵµ£º
#include "stdio.h"
#include "math.h"
#include "time.h"
#define INTERVAL 1 ¶¨ÒåºêµÄʱ¼ä¼ä¸ôΪ1Ãë
//
void On_Time() //ÿһÃ뼤·¢µÄʼþ
{
printf("now=%s\n","JJK");
}
void Timer() //ʱÖӵĺ¯Êý
{ time_t newclk,oldclk;
while(1)
&nb ......
http://blog.csdn.net/Ackarlix/archive/2007/08/25/1758412.aspx
WindowsÏÂCÍøÂç±à³ÌÈëÃÅ
CÓïÑÔµÄѧϰ£¬Ò»°ãµÄ·½Ê½ÊÇ£¬ÏÈѧC£¬È»ºóÊÇC++£¬×îºÃ»¹ÒªÓлã±àÓïÑÔºÍ΢»úÔÀí»ù´¡£¬È»ºó²ÅÊÇVisual C++¡£ÕâÑùµÄ·½Ê½£¬¶ÔѧϰÕßÀ´Ëµ£¬Òª»¨·ÑºÜ¶àʱ¼äºÍÄÍÁ¦¡£¶øÔÚѧУ½ÌѧÖУ¬Ò²Ã»ÓÐʱ¼äÉîÈëѧϰWindows±à³ÌµÄʵÓü¼ÊõÁË¡£
¡¡¡¡ ......
±¾ÎÄÊ×·¢µØÖ·£ºhttp://blog.csdn.net/liigo/archive/2009/09/22/4582018.aspx
×ªÔØÇë×¢Ã÷³ö´¦£ºhttp://blog.csdn.net/liigo
×÷Õߣºliigo, 2009/09/22
¡¡¡¡ÔÚÏÂΧÆåʱ£¬µ±Ò»¸öÆå×ÓÂäµ½ÆåÅÌÉÏ£¬Ëü»á¶ÔÖÜΧ¶Ô·½Æå×ÓµÄËÀ»î²úÉúÓ°Ï죬Èç¹û¶Ô·½Æå×ÓûÓÐÆøÁË£¨ËÀÁË£©£¬±ØÐë´ÓÆåÅÌÉÏÄõô£¨Ìá×Ó£©¡£Õâ¸ö¹ý³ÌÌåÏÖµ½Î§ÆåÈí¼þÖУ¬¾ÍÐ ......
ÍøÂçËѼ¯-×ÊÁÏ
¸ñʽ»¯ÊäÈëÊä³öº¯Êý
Turbo C2.0 ±ê×¼¿âÌṩµÄÁ½¸ö¿ØÖÆÌ¨¸ñʽ»¯ÊäÈë¡¢ Êä³öº¯Êý£ºprintf( ) ¡¢scanf()¡£
printf()º¯ÊýÓÃÀ´Ïò±ê×¼Êä³öÉ豸(ÆÁÄ»)дÊý¾Ý;
scanf() º¯ÊýÓÃÀ´´Ó±ê×¼ÊäÈëÉ豸(¼ü ......
ÔÚ´óÐÍCÓïÑÔÏîÄ¿¹¤³Ì»òÕßlinuxÄÚºËÖÐÎÒÃǶ¼»á¾³£¼ûµ½Á½¸öFASTCALLºÍarmlinkage
Á½¸ö±êʶ·û(ÐÞÊηû)£¬ÄÇôËüÃǸ÷ÓÐʲô²»Í¬ÄØ£¿½ñÌì¾Í¸ø´ó¼Ò¹²Í¬·ÖÏíÒ»ÏÂ×Ô¼ºµÄÐĵÃ.
´ó¼Ò¶¼ÖªµÀÔÚ±ê×¼CϵÖк¯ÊýµÄÐβÎÔÚʵ¼Ê´«Èë²ÎÊýµÄʱºò»áÉæ¼°µ½²ÎÊý´æ·ÅµÄÎÊÌ⣬ÄÇôÕâЩ²ÎÊý´æ·ÅÔÚÄÄÀïÄØ£¿ ÓÐÒ»¶¨ÀíÂÛ»ù´¡µÄ ......