C语言DWord文档下载推荐.docx

1、 clrscr（）; cprintf（The function DELLINE deletes the line containing thern）;cursor and moves all lines below it one line up.rnDELLINE operates within the currently active textrnwindow. Press any key to continue . . . gotoxy（1,2）; /* Move the cursor to the second line and first column */ getch（）; dell

2、ine（）; detectgraph 通过检测硬件确定图形驱动程序和模式 void far detectgraph（int far *graphdriver, int far *graphmode）;graphics.hstdlib.hstdio.h/* names of the various cards supported */char *dname = requests detection, a CGAan MCGAan EGAa 64K EGAa monochrome EGAan IBM 8514a Hercules monochromean AT&T 6300 PCa VGAan I

3、BM 3270 PC ; /* returns detected hardware info. */ int gdriver, gmode, errorcode; /* detect graphics hardware available */ detectgraph（&gdriver, &gmode）; /* read result of detectgraph call */ errorcode = graphresult（）; if （errorcode != grOk） /* an error occurred */ printf（Graphics error: %sn, graphe

4、rrormsg（errorcode）;Press any key to halt: exit（1）; /* terminate with an error code */ /* display the information detected */You have %s video display card.n, dnamegdriver）; difftime 计算两个时刻之间的时间差 double difftime（time_t time2, time_t time1）;time.h time_t first, second; first = time（NULL）; /* Gets syst

5、em time */ delay（2000）; /* Waits 2 secs */ second = time（NULL）; /* Gets system time again */The difference is: %f secondsn,difftime（second,first）; disable 屏蔽中断 void disable（void）;/*NOTE: This is an interrupt serviceroutine. You cannot compile this programwith Test Stack Overflow turned on andget an

6、executable file that operatescorrectly. */#define INTR 0X1C /* The clock tick interrupt */void interrupt （ *oldhandler）（void）;int count=0;void interrupt handler（void）/* disable interrupts during the handling of the interrupt */ disable（）;/* increase the global counter */ count+;/* reenable interrupt

7、s at the end of the handler */ enable（）;/* call the old routine */ oldhandler（）;/* save the old interrupt vector */ oldhandler = getvect（INTR）;/* install the new interrupt handler */ setvect（INTR, handler）;/* loop until the counter exceeds 20 */ while （count time_t t; struct time d_time; struct date

8、 d_date; struct tm *local; getdate（&d_date）; gettime（&d_time）; t = dostounix（&d_date, & local = localtime（&t）;Time and Date: asctime（local）; drawpoly 画多边形 void far drawpoly（int numpoints, int far *polypoints）; /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int maxx, maxy; /* ou

9、r polygon array */ int poly10; /* initialize graphics and local variables */ initgraph（&gmode, /* read result of initialization */= grOk） /* an error occurred */ /* terminate with an error code */ maxx = getmaxx（）; maxy = getmaxy（）; poly0 = 20; /* 1st vertext */ poly1 = maxy / 2; poly2 = maxx - 20;

10、/* 2nd */ poly3 = 20; poly4 = maxx - 50; /* 3rd */ poly5 = maxy - 20; poly6 = maxx / 2; /* 4th */ poly7 = maxy / 2;/* drawpoly doesnt automatically close the polygon, so we close it.*/ poly8 = poly0; poly9 = poly1; /* draw the polygon */ drawpoly（5, poly）; /* clean up */ closegraph（）; dup 复制一个文件句柄 i

11、nt dup（int handle）;string.hio.hvoid flush（FILE *stream）; char msg = This is a test; /* create a file */DUMMY.FIL, w /* write some data to the file */ fwrite（msg, strlen（msg）, 1, fp）;Press any key to flush DUMMY.FIL: /* flush the data to DUMMY.FIL without closing it */ flush（fp）;nFile was flushed, Pr

12、ess any key to quit:void flush（FILE *stream） int duphandle; /* flush TCs internal buffer */ fflush（stream）; /* make a duplicate file handle */ duphandle = dup（fileno（stream）; /* close the duplicate handle to flush the DOS buffer */ close（duphandle）; dup2 复制文件句柄 int dup2（int oldhandle, int newhandle）

13、;sysstat.hfcntl.h #define STDOUT 1 int nul, oldstdout; nul = open（, O_CREAT | O_RDWR, S_IREAD | S_IWRITE）; /* create a duplicate handle for standard output */ oldstdout = dup（STDOUT）; /* redirect standard output to DUMMY.FIL by duplicating the file handle onto the file handle for standard output. */ dup2（nul, STDOUT）; /* close the handle for DUMMY.FIL */ close（nul）; /* will be redirected into DUMMY.FIL */ write（STDOUT, msg, strlen（msg）; /* restore original standard output handle */ dup2（oldstdout, STDOUT）; /* close duplicate handle for STDOUT */ close（oldstdout）;返回C语言首页 2004-2009 C语言