C语言DWord文档下载推荐.docx

C语言DWord文档下载推荐.docx

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clrscr（）;

cprintf（"

ThefunctionDELLINEdeletes\

thelinecontainingthe\r\n"

）;

cursorandmovesalllines\

belowitonelineup.\r\n"

DELLINEoperateswithinthe\

currentlyactivetext\r\n"

window. 

Pressanykeyto\

continue..."

gotoxy（1,2）;

/*Movethecursortothe

secondlineandfirstcolumn*/

getch（）;

delline（）;

detectgraph

通过检测硬件确定图形驱动程序和模式

voidfardetectgraph（intfar*graphdriver,intfar*graphmode）;

graphics.h>

stdlib.h>

stdio.h>

/*namesofthevariouscardssupported*/

char*dname[]={"

requestsdetection"

"

aCGA"

anMCGA"

anEGA"

a64KEGA"

amonochromeEGA"

anIBM8514"

aHerculesmonochrome"

anAT&

T6300PC"

aVGA"

anIBM3270PC"

};

/*returnsdetectedhardwareinfo.*/

intgdriver,gmode,errorcode;

/*detectgraphicshardwareavailable*/

detectgraph（&

gdriver,&

gmode）;

/*readresultofdetectgraphcall*/

errorcode=graphresult（）;

if（errorcode!

=grOk） 

/*anerror

occurred*/

{

printf（"

Graphicserror:

%s\n"

\

grapherrormsg（errorcode））;

Pressanykeytohalt:

"

exit

（1）;

/*terminatewithanerror

code*/

}

/*displaytheinformationdetected*/

Youhave%svideodisplay\

card.\n"

dname[gdriver]）;

difftime

计算两个时刻之间的时间差

doubledifftime（time_ttime2,time_ttime1）;

time.h>

time_tfirst,second;

first=time（NULL）;

/*Getssystem

time*/

delay（2000）;

/*Waits2secs*/

second=time（NULL）;

/*Getssystemtime

again*/

Thedifferenceis:

%f\

seconds\n"

difftime（second,first））;

disable

屏蔽中断

voiddisable（void）;

/***NOTE:

Thisisaninterruptservice

routine.Youcannotcompilethisprogram

withTestStackOverflowturnedonand

getanexecutablefilethatoperates

correctly.*/

#defineINTR0X1C 

/*Theclocktick

interrupt*/

voidinterrupt（*oldhandler）（void）;

intcount=0;

voidinterrupthandler（void）

/*disableinterruptsduringthehandlingof

theinterrupt*/

disable（）;

/*increasetheglobalcounter*/

count++;

/*reenableinterruptsattheendofthe

handler*/

enable（）;

/*calltheoldroutine*/

oldhandler（）;

/*savetheoldinterruptvector*/

oldhandler=getvect（INTR）;

/*installthenewinterrupthandler*/

setvect（INTR,handler）;

/*loopuntilthecounterexceeds20*/

while（count<

20）

countis%d\n"

count）;

/*resettheoldinterrupthandler*/

setvect（INTR,oldhandler）;

div

将两个整数相除,返回商和余数

div_t（intnumber,intdenom）;

div_tx;

x=div（10,3）;

10div3=%dremainder%d\n"

x.quot,x.rem）;

dosexterr

获取扩展DOS错误信息

intdosexterr（structDOSERR*dblkp）;

FILE*fp;

structDOSERRORinfo;

fp=fopen（"

perror.dat"

"

r"

if（!

fp）perror（"

Unabletoopenfilefor

reading"

dosexterr（&

info）;

ExtendedDOSerror\

information:

\n"

Extendederror:

\

%d\n"

info.exterror）;

Class:

%x\n"

info.class）;

Action:

info.action）;

ErrorLocus:

info.locus）;

dostounix

转换日期和时间为UNIX时间格式

longdostounix（structdate*dateptr,structtime*timeptr）;

stddef.h>

time_tt;

structtimed_time;

structdated_date;

structtm*local;

getdate（&

d_date）;

gettime（&

d_time）;

t=dostounix（&

d_date,&

local=localtime（&

t）;

TimeandDate:

asctime（local））;

drawpoly

画多边形

voidfardrawpoly（intnumpoints,intfar*polypoints）;

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intmaxx,maxy;

/*ourpolygonarray*/

intpoly[10];

/*initializegraphicsandlocal

variables*/

initgraph（&

gmode,"

/*readresultofinitialization*/

=grOk）

/*anerroroccurred*/

/*terminatewithanerrorcode*/

maxx=getmaxx（）;

maxy=getmaxy（）;

poly[0]=20;

/*1stvertext*/

poly[1]=maxy/2;

poly[2]=maxx-20;

/*2nd*/

poly[3]=20;

poly[4]=maxx-50;

/*3rd*/

poly[5]=maxy-20;

poly[6]=maxx/2;

/*4th*/

poly[7]=maxy/2;

/*

drawpolydoesn'

tautomaticallyclose

thepolygon,sowecloseit.

*/

poly[8]=poly[0];

poly[9]=poly[1];

/*drawthepolygon*/

drawpoly（5,poly）;

/*cleanup*/

closegraph（）;

dup

复制一个文件句柄

intdup（inthandle）;

string.h>

io.h>

voidflush（FILE*stream）;

charmsg[]="

Thisisatest"

;

/*createafile*/

DUMMY.FIL"

"

w"

/*writesomedatatothefile*/

fwrite（msg,strlen（msg）,1,fp）;

Pressanykeytoflush\

DUMMY.FIL:

/*flushthedatatoDUMMY.FILwithout

closingit*/

flush（fp）;

\nFilewasflushed,Pressany\

keytoquit:

voidflush（FILE*stream）

intduphandle;

/*flushTC'

sinternalbuffer*/

fflush（stream）;

/*makeaduplicatefilehandle*/

duphandle=dup（fileno（stream））;

/*closetheduplicatehandletoflushthe

DOSbuffer*/

close（duphandle）;

dup2

复制文件句柄

intdup2（intoldhandle,intnewhandle）;

sys\stat.h>

fcntl.h>

#defineSTDOUT1

intnul,oldstdout;

nul=open（"

O_CREAT|O_RDWR,

S_IREAD|S_IWRITE）;

/*createaduplicatehandleforstandard

output*/

oldstdout=dup（STDOUT）;

/*

redirectstandardoutputtoDUMMY.FIL

byduplicatingthefilehandleontothe

filehandleforstandardoutput.

*/

dup2（nul,STDOUT）;

/*closethehandleforDUMMY.FIL*/

close（nul）;

/*willberedirectedintoDUMMY.FIL*/

write（STDOUT,msg,strlen（msg））;

/*restoreoriginalstandardoutput

handle*/

dup2（oldstdout,STDOUT）;

/*closeduplicatehandleforSTDOUT*/

close（oldstdout）;

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