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12.1.1            °´Î»ÓëÔËËã
    °´Î»ÓëÔËËã·û"&"ÊÇ˫ĿÔËËã·û¡£Æä¹¦ÄÜÊDzÎÓëÔËËãµÄÁ½Êý¸÷¶ÔÓ¦µÄ¶þ½øÎ»ÏàÓë¡£Ö»ÓжÔÓ¦µÄÁ½¸ö¶þ½øÎ»¾ùΪ1ʱ£¬½á¹ûλ²ÅΪ1£¬·ñÔòΪ0¡£²ÎÓëÔËËãµÄÊýÒÔ²¹Â뷽ʽ³öÏÖ¡£
ÀýÈ磺9&5¿ÉдËãʽÈçÏ£º
      00001001        (9µÄ¶þ½øÖƲ¹Âë)
     &00000101        (5µÄ¶þ½øÖƲ¹Âë)
      00000001        (1µÄ¶þ½øÖƲ¹Âë)
¿É¼û9&5=1¡£
°´Î»ÓëÔËËãͨ³£ÓÃÀ´¶ÔijЩλÇå0»ò±£ÁôijЩλ¡£ÀýÈç°Ña µÄ¸ß°ËλÇå 0 £¬±£ÁôµÍ°Ë룬¿É×÷a&255ÔËËã( 255 µÄ¶þ½øÖÆÊýΪ0000000011111111)¡£
¡¾Àý12.1¡¿
main(){
    inta=9,b=5,c;
    c=a&b;
   printf("a=%d\nb=%d\nc=%d\n",a,b,c);
}
12.1.2            °´Î»»òÔËËã
°´Î»»òÔËËã·û“|”ÊÇ˫ĿÔËËã·û¡£Æä¹¦ÄÜÊDzÎÓëÔËËãµÄÁ½Êý¸÷¶ÔÓ¦µÄ¶þ½øÎ»Ïà»ò¡£Ö»Òª¶ÔÓ¦µÄ¶þ¸ö¶þ½øÎ»ÓÐÒ»¸öΪ1ʱ£¬½á¹ûλ¾ÍΪ1¡£²ÎÓëÔËËãµÄÁ½¸öÊý¾ùÒÔ²¹Âë³öÏÖ¡£
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    00001001
   |00000101
    00001101        (Ê®½øÖÆÎª13)¿É¼û9|5=13
¡¾Àý12.2¡¿
main(){
    inta=9,b=5,c;
    c=a|b;
   printf("a=%d\nb=%d\nc=%d\n",a,b,c);


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#if defined(_WIN32) || defined(_WIN64)  //ΪÁËÖ§³Öwindowsƽ̨ÉϵıàÒë
#include <windows.h>
#end ......

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the c programming language ϰÌâ µÚ¶þÕÂ

exercise2.4
void squeeze(char s[],char t[])
{
int i,j,k;
int lens,lent;
lens=strlen(s);
lent=strlen(t);
for(i=0,k=0;i<lens;i++)
{
for(j=0;j<lent;j++)
if(s[i]==t[j])
break;
if(j==lent)
s[k++]=s[i];
}
s[k]='\0';

exercise2.5
int any(char s[],char t[ ......
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