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³ÌÐò-110½øÖÆת2½øÖÆ#includevoidmain(){

intdec,i=0,j,a[16];scanf(¡°%d¡±,&dec);do{

a[i]=dec%2;i++;dec=dec/2;}while(dec>=1);

for(j=i¨C1;j>=0;j--)printf(¡°%d¡±,a[j]);}

³ÌÐò-210½øÖÆת2½øÖÆ(µÝ¹é·¨)#include

voiddec2bin(intx,intn);voidmain(){intdec;

printf(\number:\scanf(\&dec);

printf(\ofdecimalform:%d\\n\dec);dec2bin(dec,sizeof(int)*8);putchar('\\n');}

voiddec2bin(intx,intn){

if(n>0){

putchar('0'+((unsigned)(x&(1<<(n-1)))>>(n-1)));dec2bin(x,n-1);}}

³ÌÐò-316½øÖÆת10½øÖÆ#includevoidmain(){

charhex[8],c,*p=hex;longintdec=0;

while(*p=='0')p++;//ºöÂÔ¿ªÍ·µÄ'0'×Ö·ûwhile(c=*p++){

dec=dec*16;//dec³Ë16if(c>='0'&&c<='9')

dec+=c-'0';

elseif(c>='a'&&c<='f')

dec+=c-'a'+10;

}

elseif(c>='A'&&c<='F')

dec+=c-'A'+10;else{

printf(¡°dataerror¡±);exit(-1);}

printf(¡°%ld¡±,dec)

×Ö·û´®1-×Ö·û´®×ª»»ÎªÊý×Ömain(){

chars[6];intn;get(s);

if(*s==¡®-¡¯)n=-chnum(s+1);elsen=chnum(s);printf(¡°%d\\n¡±,n);}

chnum(char*p){intnum=0,k,len,j;len=strlen(p);

for(;*p!=¡®0¡¯;p++){k=*p-¡¯0¡¯;j=(--len);while(j-->0){k=k*10;}num=num+k;}

return(num);}

×Ö·û´®2-ͳ¼Æ×Ó´®¸öÊýmain(){

charstr[80],substr[80];intn;

gets(str);gets(substr);

printf(¡°%d\\n¡±,count(str,substr));}

count(char*str,char*substr){inti,j,k,num=0;

for(i=0;str[i]!=¡®\\0¡¯;i++)

for(j=i,k=0;substr[k]==str[j];k++,j++)

if(substr[k+1]==¡®\\0¡¯){num++;break;}return(num);}

×Ö·û´®3-µÝ¹é·¨×Ö·û´®µ¹Ðòmain(){chars[80];

scanf(¡°%s¡±,s);invert(s);}

invert(char*a){if(!*a)return0;invert(a+1);

printf(¡°%c¡±,*a);}

×Ö·û´®4-×Ö·û´®¹ýÂË

ÒªÇ󣺹ýÂ˵ô×Ö·û´®ÖбÈÖ¸¶¨×Ö·ûСµÄ×Ö·û£¬ÔÚÔ­´®ÉÏÍê³É£¬²»µÃÁí´´½¨Ò»¸öеÄ×Ö·û´®¡£main(){

charstr[80],c;

scanf(¡°%s¡±,str);scanf(¡°%c¡±,c);filter(str,c);puts(str);}

filter(char*p,charc){

inti,j;

for(i=j=0;*(p+i)!=¡®\\0¡¯;i++)

if(*(p+i)>=c){*(p+j)=*(p+i);j++;}*(p+j)=¡®\\0¡¯;}

×Ö·û´®5-µÝ¹é·¨Êýֵתµ¹Ðò×Ö·û´®voidconvert(char*a,intn){inti;

if((i=n/10)!=0)convert(a+1,i);*a=n+¡¯0¡¯;}

main(){

intnumber;

charstr[10]=¡°¡±;

scanf(¡°%d¡±,&number);convert(str,number);puts(str);}

×Ö·û´®6-µÝ¹é·¨Êýֵת×Ö·û´®voidconvert(intn){inti;

}

main(){

intnumber;

scanf(¡°%d¡±,&number);

if(number<0){putchar(¡®-¡¯);number=-number;}convert(number);}

×Ö·û´®7-ÅжϻØÎÄ#includevoidmain(){

chars[80],*p1,*p2;intn;gets(s);n=strlen(s);p1=s;p2=s+n-1

while(p1

if(*p1!=*p2)break;else{p1+=;p2--;}}

if(p1

×Ö·û´®8-×Ö·û´®ÖÐ×óÓÒÀ¨ºÅÆ¥Åä¼ì²é#includevoidmain(){charc[80];intd;gets(c);d=check(c);

printf(¡°d=%d¡±,d);}

check(char*s){intl=0,r=0;

while(*s!=¡®\\0¡¯){if(*s==¡®(¡¯)l++;elseif(*s==¡®)¡¯){r++;

if(r>l)return0;}s++;

if((i=n/10)!=0)convert(i);putchar(n+¡¯0¡¯);