CºÍC++ÓïÑÔѧϰ×ܽá(Ò»)

CºÍC++ÓïÑÔѧϰ×ܽá(Ò»)
֪ʶ½á¹¹:
1¡¢if,for,switch,goto
2¡¢#define,const
3¡¢Îļþ¿½±´µÄ´úÂë,¶¯Ì¬Éú³ÉÄÚ´æ,¸´ºÏ±í´ïʽ,strcpy,memcpy,sizeof
4¡¢º¯Êý²ÎÊý´«µÝ,ÄÚ´æ·ÖÅ䷽ʽ,ÄÚ´æ´íÎó±íÏÖ,mallocÓënewÇø±ð
5¡¢ÀàÖØÔØ¡¢Òþ²ØÓ븲¸ÇÇø±ð,externÎÊÌâ,º¯Êý²ÎÊýµÄȱʡ
ÖµÎÊÌâ,ºê´úÂëÓëÄÚÁªº¯ÊýÇø±ð
6¡¢¹¹ÔìºÍÎö¹¹µÄ´ÎÐò,Stringº¯Êý¶¨Òå
¾ßÌåʵÏÖ:
1¡¢if,for,switch,goto
if:
bool int float pointer char ±äÁ¿µÄʹÓ÷½·¨
bool bParam;
int iParam;
float fParam;
int* pParam;
char cParam;
if(bParam) ,if(!bParam);
if(iParam == 0 ),if(iParam != 0 );
if(fParam>= -0.00001 && fParam <= 0.00001);
if(pParam == NULL),if(pParam != NULL);
if(cParam == '\0'),if(cParam != '\0');
if/else/return µÄʹÓ÷½·¨
if(condition) ¿ÉÒԵȼÛΪ return (condition?x:y);
{
return x;
}
else
{
return y;
}
for:
Ö´ÐÐЧÂÊÎÊÌâ:
int row,col,sum;
int a[100][5];
for(row=0;row <100;row++) ЧÂʵÍÓÚ for(col=0;col <5;col++)
{ {
for(col=0;col <5;col++) for(row=0;row <100;row++)
{ {
sum = sum+a[row][col]; sum = sum+a[row][col];
} }
} }
int i;
for(i=0;i <N;i++) ЧÂʵÍÓÚ if(condition)
{ {
if(condition) for(i=0;i <N;i++)
DoSomething(); DoSomething();
else }
DoOtherthing(); else
} {
for(i=0;i <N;i++)
DoOtherthing();
}
for (int x=0;x <=N-1;x++) Ö±¹ÛÐÔ²îÓÚ for (int x=0;x <N;x++)
switch:
switch(variable)
{
case value1: ...
break;
case value2: ...
break;
default: ...
break;
}
switch(c)ÖеÄcµÄÊý¾ÝÀàÐÍ¿ÉÒÔÊÇint,char,long,unsigned int,bool.
variable±ØÐëÊÇÕûÊý»òÕßÇ¿ÖÆΪÕûÊý,ÓÉÓÚcharʵ¼ÊÉÏÊÇASCIIÂë,ËùÒÔÒ²¿ÉÒÔ.
c²»¿ÉÒÔÊÇdouble,float,char*.
goto:
gotoÖ÷ÒªÓÃÓÚ
{...
{...
{....
goto error;
}
}
}
error:
...
2¡¢#define,const
#defineºÍconstÇø±ð
1¡¢#define CÓïÑÔ
const CÓïÑÔ C++ÓïÑÔ
const³£Á¿ÓÐÊý¾ÝÀàÐÍ,±àÒëÆ÷»á½øÐÐÀàÐÍ°²È«¼ì²é,¶ø#defineûÓÐÊý¾ÝÀàÐÍ,
constµÄ³£Á¿¿ÉÒÔ½øÐе÷ÊÔ,µ«ºê³£Á¿²»ÄܽøÐе÷ÊÔ.
2¡¢constµÄʹÓ÷½·¨
ÔÚÈ«¾Ö¶¨Òå const float PI=3.1415926
ÔÚÀàÖж¨Òå
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