📄 c++技巧杂谈[转贴].mht
字号:
=20
using namespace =
std;<BR><BR> =20
string itos(int =
i) =20
// =
=D5=FB=D0=CD=D7=AA=B1=E4=CE=AA=D7=D6=B7=FB=B4=AE<BR> =20
{<BR> =
=20
=
=20
stringstream s;<BR> =20
=
=20
s << i;<BR> =
=20
=
return=20
s.str();<BR> =20
}<BR><BR> =20
int main()<BR> =
=20
{<BR> =
=20
int i =3D =
127;<BR> =20
=
=20
string ss =3D =
itos(i);<BR> =20
=
=20
const char* p =3D=20
ss.c_str();<BR><BR> =
=20
=
cout=20
<< ss << " " << p <<=20
"\n";<BR> =20
=
}<BR><BR>-=D4=F5=D1=F9=B0=D1=D2=BB=B8=F6=D7=D6=B7=FB=B4=AE=D7=AA=B1=
=E4=CE=AA=D2=BB=B8=F6=D5=FB=D0=CD<BR>=D7=EE=BC=F2=B5=A5=B5=C4=B7=BD=B7=A8=
=CA=C7=CA=B9=D3=C3math.h=20
=
=BA=CDstdlib.h=D6=D0=B5=C4atoi()=BA=AF=CA=FD=A3=BA<BR>int atoi( const =
char *string );=20
<BR><BR>=C0=FD=D7=D3=A3=BA <BR>#include =
<iostream><BR>#include=20
<stdlib.h> // getch()<BR>using namespace=20
std;<BR><BR> =20
<BR>int main()<BR>{<BR> =
char =
str[4]=3D{49,55,57,'\0'};=20
<BR><BR> =
int=20
number;<BR> =20
number=3Datoi(str);<BR><BR> =
=20
cout << number << =
endl;<BR><BR> =20
return=20
=
0;<BR>}<BR><BR>=B5=AB=CA=C7atoi()=BB=E1=D2=FD=C6=F0=B1=C8=BD=CF=B6=E0=B5=C4=
=CE=CA=CC=E2=A3=AC=CB=F9=D2=D4=D0=ED=B6=E0=D3=D0=BE=AD=D1=E9=B5=C4=B3=CC=D0=
=F2=D4=B1=D7=DC=CA=C7=D4=DA=B5=DA=D2=BB=CA=B1=BC=E4=C0=EF=B7=C5=C6=FA=B6=D4=
=CB=FC=CA=C7=CA=B9=D3=C3=A1=A3=CB=FC=CB=F9=D2=FD=C6=F0=B5=C4=CE=CA=CC=E2=B6=
=E0=CA=C7=BE=E4=B1=FA=B7=BD=C3=E6=B5=C4=B4=ED=CE=F3=A1=A3=C1=ED=D2=BB=D6=D6=
=D1=A1=D4=F1=CA=C7=CA=B9=D3=C3sscanf()=BB=F2=D5=DFstringstreams=C0=B4=BD=AB=
=D2=BB=B8=F6C=D7=D6=B7=FB=B4=AE=BB=F2C++=20
=
=D7=D6=B7=FB=B4=AE=B5=C4=D5=FB=D0=CD=D6=B5=B8=B3=B8=F8=D2=BB=B8=F6=D5=FB=D0=
=CD=B5=C4=B1=E4=C1=BF=A1=A3<BR><BR>strtol()=20
=
<BR>=D7=F7=D3=C3=A3=BA=BD=AB=D7=D6=B7=FB=B4=AE=D7=AA=B1=E4=CE=AA=D2=BB=B8=
=F6=B3=A4=D5=FB=D0=CD=D6=B5=A1=A3<BR>=BA=AF=CA=FD=D4=AD=D0=CD=C8=E7=CF=C2=
=A3=BA<BR>long strtol( const=20
char *nptr, char **endptr, int base ); =
<BR>=B2=CE=CA=FD=BA=AC=D2=E5=A3=BA=20
<BR>nptr- =
=D0=E8=D2=AA=B1=BB=D7=AA=BB=BB=B5=C4=D7=D6=B7=FB=B4=AE <BR>endptr- =
=D7=D6=B7=FB=B4=AE=D6=D0=B1=BB=D7=AA=BB=BB=B2=BF=B7=D6=BD=D8=D6=B9=B5=C4=B5=
=D8=B7=BD<BR>base-=20
=CA=FD=D6=B5=B2=CE=CA=FD =
<BR>=B8=C3=BA=AF=CA=FD=D0=E8=D2=AA=B0=FC=BA=ACstdlib.h=CD=B7=CE=C4=BC=FE=A1=
=A3<BR><BR>-=CA=C7"const int"=BB=B9=CA=C7"int=20
=
const"=A3=BF<BR>=D5=E2=C6=E4=CA=B5=D6=BB=CA=C7=D2=BB=D6=D6=CA=E9=D0=B4=B7=
=E7=B8=F1=C9=CF=B5=C4=C7=F8=B1=F0=A1=A3=C3=BB=D3=D0=CA=B2=C3=B4=BC=BC=CA=F5=
=B7=C7=D2=AA=C4=E3=D3=C3=CA=B2=C3=B4=B7=E7=B8=F1=A1=A3=B4=F3=B2=BF=B7=D6=B5=
=C4=B3=CC=D0=F2=D4=B1=CF=B2=BB=B6=CA=B9=D3=C3"const=20
=
int"=CA=E9=D0=B4=B7=E7=B8=F1=A1=A3<BR><BR>-=D4=F5=D1=F9=B4=B4=BD=A8=CD=B7=
=CE=C4=BC=FE?<BR>=D2=BB=B8=F6=CD=B7=CE=C4=BC=FE=B2=BB=B9=FD=CA=C7=D2=BB=B6=
=CE=CE=C4=B1=BE=A1=A3=C4=E3=C4=DC=CD=A8=B9=FD=C8=CE=BA=CE=D2=BB=B8=F6=CE=C4=
=B1=BE=B1=E0=BC=AD=C6=F7=C0=B4=B4=B4=BD=A8=CB=FC=A1=A3=CB=FC=B1=D8=D0=EB=B0=
=FC=BA=AC=BA=EA=B6=A8=D2=E5=A1=A2=BA=AF=CA=FD=C9=EA=C3=F7=A1=A2=C0=E0=B5=C4=
=C9=EA=C3=F7=D2=D4=BC=B0=C8=AB=BE=D6=B1=E4=C1=BF=B5=C4=C9=EA=C3=F7=A1=A3<=
BR>=B6=F8=BA=AF=CA=FD=B5=C4=B6=A8=D2=E5=A1=A2=C0=E0=B5=C4=B6=A8=D2=E5=D2=D4=
=BC=B0=C8=AB=BE=D6=B1=E4=C1=BF=B5=C4=B6=A8=D2=E5=B1=D8=D0=EB=D4=DA=D2=BB=B8=
=F6=BB=F2=B6=E0=B8=F6=C4=A3=BF=E9=D6=D0=B1=BB=B1=E0=D2=EB=B5=BD=C4=BF=B1=EA=
=CE=C4=BC=FE=D6=D0=A1=A3<BR>=B5=B1=C4=E3=D0=E8=D2=AA=B4=D3=D2=BB=B8=F6=C4=
=A3=BF=E9=D6=D0=B5=F7=D3=C3=C1=ED=D2=BB=B8=F6=C4=A3=BF=E9=CA=B1=A3=AC=C4=E3=
=D6=BB=D0=E8=D2=AA=B0=FC=BA=AC=CF=E0=D3=A6=B5=C4=CD=B7=CE=C4=BC=FE=A3=AC=B2=
=A2=B0=D1=CB=FC=CF=E0=B9=D8=B5=C4=C4=BF=B1=EA=CE=C4=BC=FE=C1=B4=BD=D3=B5=BD=
=B3=CC=D0=F2=D6=D0=BC=B4=BF=C9=A1=A3<BR><BR>-=D4=F5=D1=F9=CA=B9=C4=E3=B5=C4=
=CA=E4=C8=EB=CB=E6=CA=E4=C8=EB=B2=BB=B6=CF=B5=C4=D4=DA=C6=C1=C4=BB=C9=CF=CF=
=D4=CA=BE=A3=BF<BR>#include=20
<iostream><BR>#include <conio.h> //=20
getch()<BR>using namespace std;<BR><BR>int=20
main()<BR>{<BR> =20
int input;<BR> =
=20
cout << "Enter number: " ;<BR> =
while ((input =
=3D getch())=20
!=3D '\r')<BR> =20
=
putchar('=20
');<BR> =20
=
//=CF=D6=D4=DA=C4=E3=B5=C4=CA=E4=C8=EB=B6=BC=B4=E6=B4=A2=D4=DA"inpu=
t"=B1=E4=C1=BF=D6=D0=C1=CB<BR> =20
return=20
=
0;<BR>}<BR><BR>-=D4=F5=D1=F9=D4=DAENTER=B1=BB=BC=FC=C8=EB=D2=D4=C7=B0=B6=C1=
=C8=A1=C4=E3=D2=D1=BE=AD=CA=E4=C8=EB=B5=C4=D0=C5=CF=A2=A3=BF<BR>#include =
<iostream><BR>#include <conio.h> //=20
getch()<BR>using namespace std;<BR><BR>int=20
main()<BR>{<BR> int=20
keyPress;<BR><BR> cout =
<<=20
"Enter a number between 1 and 3: ";<BR> =20
keyPress =3D =
getch();<BR><BR> =20
switch (keyPress)<BR> =20
{<BR> =
case=20
'1':<BR> =
cout=20
<< "You entered one!\n";<BR> =
=20
break;<BR> =20
case '2':<BR> =
=20
cout << "You entered=20
two!\n";<BR> =
=20
break;<BR> case =
'3':<BR> =20
cout << =
"You=20
entered three!\n";<BR> =
=20
break;<BR> =20
default:<BR> =
=20
cout << "Not a number =
between=20
1 and 3!\n";<BR> =
=20
break;<BR> }<BR> =20
return=20
=
0;<BR>}<BR><BR><BR>-=D4=F5=D1=F9=BC=FC=C8=EB=C8=CE=D2=E2=D2=BB=B8=F6=BC=FC=
=C0=B4=D6=D5=BD=E1=B3=CC=D0=F2=A3=BF<BR>#include=20
<iostream><BR>#include =
<conio.h><BR>using=20
namespace std;<BR><BR>int =
main()<BR>{<BR><BR> =20
=20
while(!_kbhit())<BR> =20
{<BR> =
=20
=
cout=20
<< "Press any key to exit" <<=20
endl;<BR> =20
}<BR><BR> =20
return=20
=
0;<BR>}<BR><BR>-=CA=B9=D3=C3typedef=BA=CD=D4=A4=B4=A6=C0=ED=BA=EA=B5=C4=C7=
=F8=B1=F0=CA=C7=CA=B2=C3=B4=A3=BF<BR>Typedef=BA=CD#define=B6=BC=BF=C9=D2=D4=
=D3=C3=C0=B4=B6=D4=D2=D1=D3=D0=B5=C4=CA=FD=BE=DD=C0=E0=D0=CD=B8=B3=D3=E8=D2=
=BB=B8=F6=D0=C2=B5=C4=B1=F0=C3=FB=A1=A3=B6=F8=CE=CA=CC=E2=B5=C4=B3=F6=CF=D6=
=CA=C7=B5=B1=CE=D2=C3=C7=B6=D4=D6=B8=D5=EB=D5=E2=D6=D6=C0=E0=D0=CD=B5=C4=B2=
=D9=D7=F7=CA=B1=A1=A3<BR>Typedefs=D4=DA=D5=E2=B8=F6=CA=B1=BA=F2=C4=DC=D7=F6=
=B3=F6=D5=FD=C8=B7=B5=C4=B4=A6=C0=ED=A1=A3=BF=B4=CF=C2=C3=E6=B5=C4=C0=FD=D7=
=D3=A3=BA<BR>typedef=20
char *string_t; <BR>#define char *string_d=20
<BR><BR>string_t s1,s2; <BR>string_d s3,s4;=20
=
<BR><BR>=D4=DA=C9=CF=C3=E6=B5=C4=C9=EA=C3=F7=D6=D0=A3=ACs1,s2 =BA=CD=20
=
s3=B6=BC=B1=BB=C9=EA=C3=F7=CE=AA=D7=D6=B7=FB=D0=CD=D6=B8=D5=EB=A3=AC=B6=F8=
s4=C8=B4=B1=BB=C9=EA=C3=F7=CE=AA=D7=D6=B7=FB=A3=AC=D5=E2=B2=A2=B2=BB=CA=C7=
=D4=A4=C6=DA=CB=F9=CF=EB=B5=C3=B5=BD=B5=C4=BD=E1=B9=FB=A1=A3<BR>=C4=C7=BC=
=C8=C8=BB=CA=C7=D5=E2=D1=F9=A3=AC=CE=AA=CA=B2=C3=B4=BB=B9=D2=AA=CA=B9=D3=C3=
=D4=A4=B4=A6=C0=ED=BA=EA=C4=D8=A3=BF=D2=F2=CE=AA=D4=A4=B4=A6=C0=ED=BA=EA=B5=
=C4=BA=C3=B4=A6=CA=C7=D4=DA=CA=B9=D3=C3=D6=EE=C8=E7#ifdef=CA=B1=CC=E5=CF=D6=
=B3=F6=C0=B4=B5=C4=A1=A3<BR><BR>-=CE=AA=CA=B2=C3=B4=D5=E2=D1=F9=B5=C4=C2=B7=
=BE=B6=BB=E1=CC=E1=CA=BE=B4=ED=CE=F3=B5=C4=D0=C5=CF=A2=A3=BF<BR>fopen("c:=
\newdir\file.dat",=20
"r"<IMG=20
=
src=3D"http://25.20.176.12/bbs/images/smilies/wink.gif"=20
align=3DabsMiddle border=3D0>;=20
=
<BR>=CA=B5=BC=CA=C9=CF=A3=AC=D4=DA=CB=AB=D2=FD=BA=C5=D6=D0=D2=AA=B1=ED=CA=
=BE=B7=B4=D0=B1=CF=DF=A3=AC=D4=DAC++=D6=D0=B1=D8=D0=EB=CA=C7"\\"=A1=A3<BR=
>=CB=F9=D2=D4=D5=FD=C8=B7=B5=C4=D0=B4=B7=A8=CA=C7=A3=BA<BR>fopen("c:\\new=
dir\\file.dat",=20
"r"<IMG=20
=
src=3D"http://25.20.176.12/bbs/images/smilies/wink.gif"=20
align=3DabsMiddle border=3D0>; =
<BR> <BR>-char=20
s[3] =3D=20
=
"cpp"=CA=C7=BA=CF=B7=A8=B5=C4=C2=F0=A3=BF<BR>=C6=E4=CA=B5=D4=DAANSI-C=D6=D0=
=CA=C7=CD=EA=C8=AB=BA=CF=B7=A8=B5=C4=A3=AC=B5=AB=BD=F6=BD=F6=D4=DA=BA=DC=C9=
=D9=B5=C4=C7=E9=BF=F6=CF=C2=CA=B9=D3=C3=A1=A3=CB=FC=C9=EA=C3=F7=C1=CB=D2=BB=
=B8=F6=B4=F3=D0=A1=CE=AA3=B5=C4=D7=D6=B7=FB=CA=FD=D7=E9=B2=A2=B3=F5=CA=BC=
=BB=AF=CE=AA"a"=A3=AC"b"=A3=AC"c"=A3=AC=C3=BB=D3=D0"\0"=D7=D6=B7=FB=A1=A3=
=D2=F2=B4=CB=B4=D3=C4=B3=D6=D6=D2=E2=D2=E5=C9=CF=C0=B4=BD=AB=CB=FC=B2=BB=CA=
=C7=D2=BB=B8=F6=D5=E6=D5=FD=B5=C4C=D7=D6=B7=FB=B4=AE=A3=AC=B2=A2=C7=D2=B2=
=BB=C4=DC=CA=B9=D3=C3=BA=AF=CA=FDstrcpy()=A3=AC%s=B8=F1=CA=BD=B5=C4printf=
=D2=D4=BC=B0=C6=E4=CB=FB=D7=D6=B7=FB=B4=AE=BA=AF=CA=FD=A1=A3<BR>=B5=AB=D7=
=EE=BA=C3=B5=C4=C9=EA=C3=F7=CA=C7=C1=F4=B3=F6=B6=EE=CD=E2=B5=C4=BF=D5=BC=E4=
=B8=F8=D7=D6=B7=FBNULL=A1=A3<BR><BR>char=20
s[4]=3D "cpp"; <BR>or <BR>char s[]=3D "cpp";=20
=
<BR><BR>-=D4=F5=D1=F9=B5=C3=B5=BD=B5=B1=C7=B0=B5=C4=CA=B1=BC=E4=A3=BF<BR>=
#include<stdio.h>=20
<BR>#include<time.h> <BR>main() <BR>{ =
<BR>time_t=20
now; <BR>time(&now); <BR>printf("Its=20
%.24s\n",ctime(&now)); <BR>return 0; <BR>}=20
=
<BR><BR><BR>-=D4=F5=D1=F9=D4=DA=D2=BB=D0=D0=C0=EF=BD=BB=BB=BB=C1=BD=B8=F6=
=D5=FB=D0=CD=CA=FD=A3=BF<BR>=D3=C3=D2=EC=BB=F2=B2=D9=D7=F7=B7=FB=BF=C9=D2=
=D4=D7=F6=B5=BD=A1=A3<BR>a^ =3D b^ =3D=20
a^ =3D b; =
<BR><BR>=CF=C2=C3=E6=CA=C7=B8=F6=D0=A1=C0=FD=D7=D3=A3=BA<BR><BR>main() =
<BR>{ <BR>int a =3D=20
5, b =3D4; <BR>a^ =3D b^ =3D a^ =3D b; =
<BR>printf("a =3D %d b =3D=20
%d" a,b); <BR>}=20
=
<BR><BR><BR>-=D4=F5=D1=F9=BB=F1=C8=A1=B4=C5=C5=CC=B5=C4=C7=FD=B6=AF=C5=CC=
=B7=FB=A3=BF<BR>=CA=B9=D3=C3_getdrive()=BA=AF=CA=FD=A3=BA<BR><BR>#include=
<direct.h>=20
<BR>main() <BR>{ <BR>int disk; <BR><BR>disk =3D=20
_getdrive()+ 'A' -1; <BR>printf("The current =
drive is=20
%c", disk); <BR>}=20
=
<BR><BR>-=D4=DA=D2=BB=B8=F6=B3=CC=D0=F2=D6=B4=D0=D0=B5=C4=B9=FD=B3=CC=D6=D0=
=D4=F5=D1=F9=BB=F1=C8=A1=CB=FC=B5=C4=C3=FB=D7=D6=A3=BF<BR>=C4=E3=BB=F2=D0=
=ED=B4=D3=C0=B4=BE=CD=C3=BB=D3=D0=D2=AA=D6=AA=B5=C0=D5=FD=D4=DA=D6=B4=D0=D0=
=B5=C4=B3=CC=D0=F2=B5=C4=C3=FB=D7=D6=B1=D8=D2=AA=A1=A3=C6=E4=CA=B5=D5=FD=D4=
=DA=D6=B4=D0=D0=B5=C4=B3=CC=D0=F2=B5=C4=C3=FB=D7=D6=B5=C4=CD=EA=D5=FB=C2=B7=
=BE=B6=B6=BC=B4=E6=B4=A2=D4=DA=D7=D6=B7=FB=B4=AEargv[0]=D6=D0=A1=A3=CD=A8=
=B9=FD=D5=D2=B5=BD=C6=E4=C3=FB=D7=D6=B5=C4=CF=E0=B9=D8=D0=C5=CF=A2=A3=AC=C4=
=E3=BF=C9=D2=D4=CA=B9=B5=C3=D7=D4=BC=BA=B5=C4=C4=B3=D6=D6=B2=A1=B6=BE=B8=D0=
=C8=BE=B8=C3=CE=C4=BC=FE=A3=AC=C9=F5=D6=C1=C9=BE=B3=FD=CB=FC=A1=A3<BR><BR=
>#include<stdio.h>=20
<BR>main(int argc,char *argv[]) <BR>{ <BR>/*=20
=
<BR>=D0=B4=C4=E3=CB=F9=CF=EB=D7=F6=B5=C4=B9=A4=D7=F7=A1=A3=B1=C8=C8=E7=C0=
=FB=D3=C3autoexec.bat=BB=F2win.ini=BB=F2=C6=E4=CB=FB=B5=C4=CE=C4=BC=FE=A1=
=A3<BR>*/=20
<BR>unlink(argv[0]); <BR><BR>}=20
=
<BR><BR>-memcpy()=BA=CDmemmove()=B5=C4=C7=F8=B1=F0=CA=C7=CA=B2=C3=B4=A3=BF=
<BR>=C6=E4=CA=B5memcopy=20
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