《C Primer Plus》第六版 第十一章编程练习答案.docx

1#include#include#define SIZE 100void input(char *, int );int main(void)char arrSIZE;int n;puts(input the number of n:);scanf(%d, &n);getchar();puts(input your string: );input(arr, n);printf(%sn, arr);getchar();return 0;void input(char *Arr, int len)int i;for (i=0; ilen; i+)*(Arr+i)=getchar();*(Arr+i)=0;while(getchar() !=n)continue;2.#include#include#define SIZE 100void input(char *, int );int main(void)char arrSIZE;int n;puts(input the number of n:);scanf(%d, &n);getchar();puts(input your string: );input(arr, n);puts(arr);getchar();return 0;void input(char *Arr, int len)int i;for (i=0; ilen; i+)*(Arr+i)=getchar();if (*(Arr+i) = | *(Arr+i)=t | *(Arr+i)= n)break;*(Arr+i)=0;while(getchar() !=n)continue;3.#include#include#define SIZE 100void input(char * );int main(void)char arrSIZE;puts(input your string: );input(arr);puts(arr);getchar();return 0;void input(char *Arr)char ch;int i=1;doch=getchar();while(ch = | ch =t | ch =n);Arr0=ch;while( (ch=getchar() &( ch!= & ch!=t & ch!=n)Arri=ch;i+;Arri=0;while (getchar()!=n)continue;4.#include#include#define SIZE 100void input(char *, int );int main(void)char arrSIZE;int n;puts(input the number of n:);scanf(%d, &n);puts(input your string: );input(arr, n);puts(arr);getchar();return 0;void input(char *Arr, int len)char ch;int i=1;doch=getchar();while(ch = | ch =t | ch =n);Arr0=ch;while( (ch=getchar() &( ch!= & ch!=t & ch!=n) & ilen)Arri=ch;i+;Arri=0;while (getchar()!=n)continue;5.#include#include#define SIZE 100char *find(char *, char );int main(void)char arrSIZE;char ch;char *ps;while(1)puts(input a string:);fgets(arr, 100, stdin);puts(input a character:);ch=getchar();ps=find(arr, ch);if(ps)puts(Find the character!);elseputs(Cont find the charcter!);getchar();getchar();return 0;char *find(char *Arr, char c)int len=strlen(Arr);char *p=Arr;int i;for (i=0; ilen; i+)if (c= *p)return p;p+;if (i=len)return NULL;return 0;6.#include#include#define SIZE 100int is_within(char *, char );int main(void)char arrSIZE;char ch;int re;while(1)puts(input a string:);fgets(arr, 100, stdin);puts(input a character:);ch=getchar();re=is_within(arr, ch);if(re)puts(Find the character!);elseputs(Cont find the charcter!);getchar();getchar();return 0;int is_within(char *Arr, char c)int len=strlen(Arr);char *p=Arr;int i;for (i=0; ilen; i+)if (c= *p)return 1;p+;if (i=len)return 0;elsereturn -1;7.#include#include#define SIZE 20char *mystrncpy(char *, char *, int );int main(void)char s1SIZE;char s2SIZE;char *ps;int n;while(1)puts(input string s2:);gets(s2);puts(input string s1:);gets(s1);puts(Input the number of n:);scanf(%d, &n);ps=mystrncpy(s1,s2, n );puts(After copy:);puts(ps);getchar();getchar();return 0;char *mystrncpy(char *dst, char *src, int len)int i;char *p1, *p2;int L=strlen(src);p2=src;p1=dst;for (i=0; i(Llen? L:len); i+)*(p1+i)=*(p2+i);return p1;8.#include#include#define SIZE 20char *string_in(char *, char * );int main(void)char s1SIZE;char s2SIZE;char *ps;while(1)puts(input string s2:);gets(s2);puts(input string s1:);gets(s1);ps=string_in(s1,s2);if (ps)puts(Find it!);elseputs(Cont find it!);getchar();getchar();return 0;char *string_in(char *s1, char *s2)int len1, len2;int i, j, temp;char *p1=s1;char *p2=s2;len1=strlen(s1);len2=strlen(s2);if (*p1=0 | *p2 =0) return NULL;for (i=0; i(len1-len2) return NULL;9#include#include#define SIZE 20void fun(char *);int main(void)char arrSIZE;while(1)puts(input a string:);gets(arr);fun(arr);puts(arr);getchar();getchar();return 0;void fun(char *Arr)char *p=Arr;int len=strlen(Arr);int i;char ch;for (i=0; ilen/2; i+)ch=pi;pi=plen-i-1;plen-i-1=ch;10#include#include#define SIZE 20void fun(char *);int main(void)char arrSIZE;while(1)puts(input a string:);gets(arr);if (arr0=n) break;fun(arr);puts(arr);getchar();getchar();return 0;void fun(char *Arr)int i, j;char tempSIZE;i=j=0;while(Arri!=0)if (Arri!= )tempj=Arri;j+;i+;strcpy(Arr, temp);Arrj=0;11.#include#include#define SIZE 20#define LIM 3void display(char *String);void Ascii( char *String);void Length(char *String);void FirstC(char *String);int First_word(char String);int main(void)char inputLIMSIZE;char ch;char *ptrLIM;while (1)int ct=0;puts(please input 10 strings:);while (ctLIM )gets(inputct);ptrct=inputct;ct+;puts(*);puts(a. print the original strings:);puts(b. print the strings with ASCII order:);puts(c. print the strings with length order:);puts(d. print the strings with first character order:);puts(e. quit.);puts(*input your choice *);ch=getchar();switch (ch)case a:display(ptr); break;case b:Ascii(ptr); break;case c:Length(ptr); break;case d:FirstC(ptr); break;default:return 0;getchar();getchar();return 0;void display(char *String)int i;for (i=0; iLIM; i+)puts(Stringi);void Ascii(char *String)char *p;int i,j;for (i=0; iLIM; i+)for (j=0; j0)p=Stringj;Stringj=Stringj+1;Stringj+1=p;display(String);void Length(char *String)char *p;int i,j;for (i=0; iLIM; i+)for (j=0; jstrlen(Stringj+1)p=Stringj;Stringj=Stringj+1;Stringj+1=p;display(String);int First_word(char String)int i=0;while (Stringi != )i+;return i;void FirstC(char *String)char *p;int i,j;for (i=0; iLIM; i+)for (j=0; jFirst_word(Stringj+1)p=Stringj;Stringj=Stringj+1;Stringj+1=p;display(String);12#include#include#includeint main(void)int ch;int word, large, small, punctuation, num, begin;word=large=small=punctuation=num=begin=0;while( (ch=getchar() != EOF) if (isdigit(ch)num+;if(ispunct(ch)punctuation+;if (isupper(ch)large+;if (islower(ch)small+;if ( isalpha(ch)if (begin=0)word+;begin=1;elsebegin=0;printf(words=%d, large=%d, small=%d, punc=%d, num=%dn, word, large, small, punctuation, num);getchar();return 0;13.#include#includevoid Reverse(char *, int );int main(void)char str100;int len;puts(Enter a string:);gets(str);len=strlen(str);Reverse(str, len);getchar();return 0;void Reverse(char *str, int n)int i;char ch;for (i=0; in/2; i+)ch=stri;stri=strn-i-1;strn-i-1=ch;for (i=0; in; i+)putchar(stri);putchar(n);14.#include#include#includeint main(int argc, char *argv)double number, value;int p;printf(The command lines has %d arguments:n, argc-1);num