《C Primer Plus》第六 第十一章编程练习答案.docx

C Primer Plus第六 第十一章编程练习答案1 #include<stdio.h> #include<string.h> #defineSIZE 100 void input(char *, int ); int main(void) chararrSIZE; 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, intlen) inti; for (i=0; i<len; i+) *(Arr+i)=getchar; *(Arr+i)='0' while(getchar !='n') continue; 2. #include<stdio.h> #include<string.h> #defineSIZE 100 void input(char *, int ); int main(void) chararrSIZE; 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, intlen) inti; for (i=0; i<len; i+) *(Arr+i)=getchar; if (*(Arr+i) =' ' | *(Arr+i)='t' break; *(Arr+i)='0' while(getchar !='n') continue; 3. #include<stdio.h> #include<string.h> #defineSIZE 100 | *(Arr+i)= 'n') void input(char * ); int main(void) chararrSIZE; puts("input your string: "); input(arr); puts(arr); getchar; return 0; void input(char *Arr) charch; inti=1; do ch=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<stdio.h> #include<string.h> #defineSIZE 100 void input(char *, int ); int main(void) chararrSIZE; 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, intlen) charch; inti=1; do ch=getchar; while(ch =' ' | ch ='t' | ch ='n'); Arr0=ch; while( (ch=getchar) &&( ch!=' '&&ch!='t'&&ch!='n') &&i<len) Arri=ch; i+; Arri='0' while (getchar!='n') continue; 5. #include<stdio.h> #include<string.h> #defineSIZE 100 char *find(char *, char ); int main(void) chararrSIZE; charch; 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!"); else puts("Con't find the charcter!"); getchar; getchar; return 0; char *find(char *Arr, charc) intlen=strlen(Arr); char *p=Arr; inti; for (i=0; i<len; i+) if (c= *p) return p; p+; if (i=len) returnNULL; return 0; 6. #include<stdio.h> #include<string.h> #defineSIZE 100 intis_within(char *, char ); int main(void) chararrSIZE; charch; 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!"); else puts("Con't find the charcter!"); getchar; getchar; return 0; intis_within(char *Arr, charc) intlen=strlen(Arr); char *p=Arr; inti; for (i=0; i<len; i+) if (c= *p) return 1; p+; if (i=len) return 0; else return -1; 7. #include<stdio.h> #include<string.h> #defineSIZE 20 char *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, intlen) inti; char *p1, *p2; int L=strlen(src); p2=src; p1=dst; for (i=0; i<(L<len? L:len); i+) *(p1+i)=*(p2+i); return p1; 8. #include<stdio.h> #include<string.h> #defineSIZE 20 char *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!"); else puts("Con't find it!"); getchar; getchar; return 0; char *string_in(char *s1, char *s2) int len1, len2; inti, j, temp; char *p1=s1; char *p2=s2; len1=strlen(s1); len2=strlen(s2); if (*p1='0' | *p2 ='0') returnNULL; for (i=0; i<=(len1-len2); i+) temp=i; j=0; while(p2j!='0'&& p1temp=p2j) temp+; j+; if (j=len2) return (p1+temp); if (i>(len1-len2) returnNULL; 9 #include<stdio.h> #include<string.h> #defineSIZE 20 void fun(char *); int main(void) chararrSIZE; while(1) puts("input a string:"); gets(arr); fun(arr); puts(arr); getchar; getchar; return 0; void fun(char *Arr) char *p=Arr; intlen=strlen(Arr); inti; charch; for (i=0; i<len/2; i+) ch=pi; pi=plen-i-1; plen-i-1=ch; 10 #include<stdio.h> #include<string.h> #defineSIZE 20 void fun(char *); int main(void) chararrSIZE; while(1) puts("input a string:"); gets(arr); if (arr0='n') break; fun(arr); puts(arr); getchar; getchar; return 0; void fun(char *Arr) inti, j; char tempSIZE; i=j=0; while(Arri!='0') if (Arri!=' ') tempj=Arri; j+; i+; strcpy(Arr, temp); Arrj='0' 11. #include<stdio.h> #include<string.h> #defineSIZE 20 #defineLIM 3 void display(char *String); voidAscii( char *String); void Length(char *String); voidFirstC(char *String); intFirst_word(char String); int main(void) char inputLIMSIZE; charch; char *ptrLIM; while (1) intct=0; puts("please input 10 strings:"); while (ct<LIM ) 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) inti; for (i=0; i<LIM; i+) puts(Stringi); voidAscii(char *String) char *p; inti,j; for (i=0; i<LIM; i+) for (j=0; j<LIM-i-1; j+) if (strcmp(Stringj, Stringj+1)>0) p=Stringj; Stringj=Stringj+1; Stringj+1=p; display(String); void Length(char *String) char *p; inti,j; for (i=0; i<LIM; i+) for (j=0; j<LIM-i-1; j+) if (strlen(Stringj)>strlen(Stringj+1) p=Stringj; Stringj=Stringj+1; Stringj+1=p; display(String); intFirst_word(charString) inti=0; while (Stringi != ' ') i+; returni; voidFirstC(char *String) char *p; inti,j; for (i=0; i<LIM; i+) for (j=0; j<LIM-i-1; j+) if (First_word(Stringj)>First_word(Stringj+1) p=Stringj; Stringj=Stringj+1; Stringj+1=p; display(String); 12 #include<stdio.h> #include<string.h> #include<ctype.h> int main(void) intch; 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; else begin=0; printf("words=%d, large=%d, small=%d, punc=%d, num=%dn", word, large, small, punctuation, num); getchar; return 0; 13. #include<stdio.h> #include<string.h> void Reverse(char *, int ); int main(void) charstr100; intlen; puts("Enter a string:"); gets(str); len=strlen(str); Reverse(str, len); getchar; return 0; void Reverse(char *str, intn) inti; charch; for (i=0; i<n/2; i+) ch=stri; stri=strn-i-1; strn-i-1=ch; for (i=0; i<n; i+) putchar(stri); putchar('n'); 14. #include<stdio.h> #include<stdlib.h> #include<math.h> int main(intargc, char *argv) double number, value; int p; printf("The command lines has %d arguments:n", argc-1); number=atoi(argv1); p=atoi(argv2); value=pow(number, p); printf("the result=%lfn", value); getchar; return 0; 15. #include<stdio.h> #include<math.h> #include<string.h> #include<ctype.h> intmyatoi(char *); int main(intargc, char *argv) charstr50=0; int re; while(gets(str) re=myatoi(str); printf("number=%dn", re); getchar; return 0; intmyatoi(char *p) intlen=strlen(p); inti; int n=0; for (i=0; i<len; i+) if (!isdigit(pi) return 0; else n=n*10+(pi-'0'); return n; 16. #include<stdio.h> #include<math.h> #include<string.h> #include<ctype.h> int main(intargc, char *argv) charch; if (argv10='-') if (argv11='l') while (ch=getchar)!=EOF) putchar(tolower(ch); elseif (argv11='u') while (ch=getchar)!=EOF) putchar(toupper(ch); else while (ch=getchar)!=EOF) putchar(ch); getchar; return 0;