2、if(x>v[mid])low=mid+1;else/*foundmatch*/returnmid;}return-1;/*nomatch*/}for(expr1;expr2;expr3)statement等价expr1;while(expr2){statementexpr3;}循环体由多条语句构成，一定要用花括号括起来，注意空循环不要把循环语句的下一条语句看成是循环体。P69#include/*reverse:reversestringsinplace*/voidreverse(chars[]){intc,i,j;for(i=0
3、,j=strlen(s)-1;i0&&t[k]==' ')
4、returni;}return-1;}#include/*atoi:convertstointeger;version2*/intatoi(chars[]){inti,n,sign;for(i=0;isspace(s[i]);i++)/*skipwhitespace*/;sign=(s[i]=='-')?-1:1;if(s[i]=='+'
5、
6、s[i]=='-')/*skipsign*/i++;for(n=0;isdigit(s[i]);i++)n=10*n+(s[i]-'0');returnsign*n;}inthtoi(chars
7、[]){inti,n;i=0;n=0;if(s[i]==’0’)/*跳过0x或0X*/{i++;if(s[i]==’x’
8、
9、s[i]==’X’)i++;}for(;s[i]!=' ';i++){if(s[i]>='0'&&s[i]<='9')n=n*16+s[i]-'0';if(s[i]>='a'&&s[i]<='f')n=n*16+s[i]-'a'+10;if(s[i]>='A'&&s[i]<='F')n=n*16+s[i]-'A'+10;}return(n);}/*itoa:convertntocharactersins*/voiditoa(i
10、ntn,chars[]){inti,sign;if((sign=n)<0)/*recordsign*/n=-n;/*makenpositive*/i=0;do{/*generatedigitsinreverseorder*/s[i++]=n%10+'0';/*getnextdigit*/}while((n/=10)>0);/*deleteit*/if(sign<0)s[i++]='-';s[i]=' ';reverse(s);}break与continue的区别例：输出2位数中所有能同时被3和5整除的数。#include"stdio.h"main(
11、){intn;for(n=10;n<100;n++){if(n%3!=0
12、
13、n%5!=0)continue;printf("%5d",n);}}运行结果：153045607590staticchardaytab[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};/*day_of_year:setdayofyearfrommonth&day*/intday_of_year(intyear,intmonth,intday){in
14、ti,leap;leap=year%4==0&&year%100!=0
15、
16、year%400==0;for(i
