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1.   setwritemodeº¯Êý
setwritemodeº¯ÊýµÄ¹¦ÄÜÊÇÉèÖÃͼÐη½Ê½Ï»­ÏßµÄÊä³öģʽ£¬ÆäÓ÷¨Îª£ºvoid far setwritemode(int mode);³ÌÐòʵÀýÈçÏ£º
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
   int gdriver = DETECT, gmode, errorcode;
   int xmax, ymax;
   initgraph(&gdriver, &gmode, "");
   errorcode = graphresult();
   if (errorcode != grOk)
   {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);
   }
   xmax = getmaxx();
   ymax = getmaxy();
   setwritemode(XOR_PUT);
   line(0, 0, xmax, ymax);
   getch();
   line(0, 0, xmax, ymax);
   getch();
   setwritemode(COPY_PUT);
   line(0, 0, xmax, ymax);
   getch();
   closegraph();
   return 0;
}
 2.  signalº¯Êý
signalº¯ÊýµÄ¹¦ÄÜÊÇÉèÖÃijһÐźŵĶÔÓ¦¶¯×÷£¬ÆäÓ÷¨Îªint signal(int sig, sigfun fname);³ÌÐòʵÀý´úÂëÈçÏ£º
#pragma inline
#include <stdio.h>
#include <signal.h>
void Catcher(int sig, int type, int *reglist)
{
   printf("Caught it!\n");
   *(reglist + 8) = 3;            
}
int main(void)
{
   signal(SIGFPE, Catcher);
   asm     mov     ax,07FFFH    
   asm     in


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while(c=''||c=='\t'||c=='\n')
 c=getc(f);
c= ''||c=='\t'||c=='\n'
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if((filedesc==open(argv[i],0))<0)
 error();
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#include <iostream.h>
#include <string.h>
/*×Ö·û´®Ìæ»»£¬µÚÒ»¸ö²ÎÊýΪԭ´®£¬µÚ¶þ¸ö²ÎÊýΪҪƥÅäµÄ×Ó´®
µÚÈý¸ö²ÎÊýÎªÒªÌæ»»µÄµÚÒ»¸ö×Ó´®Öаüº¬µÚ¶þ¸ö×Ó´®µÄ²¿·Ö*/
char *strReplace(char *str1,char *str2,char *str3);
void main() ......
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