C语言程序设计第6章习题答案.doc

1、选择题（1）A（2）C（3）A（4）B（5）B（6）D（7）D（8）B（9）D（10）B2、填空题（1）a=10,b=20a=20,b=10（2）*pp=603、程序设计题（1）#includechar *month_name(int n);void main() int n; printf(nPlease enter 1 integer:); scanf(%d,&n); printf(%d month :%sn,n,month_name(n);char *month_name(int n)static char*name=illegal month, Jan,Feb,Mar,Apr,May,Jun,July,Aug,Sept,Oct,Nov,Dec; return (n12)?name0:namen);（2）#include#define N 10sort(int data) int i,j,min_a,temp; for(i=0;iN;i+) min_a=i; for(j=i+1;jN;j+) if(*(data+j)*(data+min_a) min_a=j; if(min_a!=i) temp=*(data+min_a); *(data+min_a)=*(data+i); *(data+i)=temp; main() int i,j,dataN,temp; int min_a; printf(nPlease input %d int:n,N); for(i=0;iN;i+) scanf(%d,&datai); sort(data); printf(After sorted:n); for(i=0;iN;i+) printf( %d,datai);（3）#include void reverse(char *c);void main() char str80; puts(Please enter 1 stringn); gets(str); reverse(str) ; puts(After reversedn); puts(str); void reverse(char *c) char *p,*q,temp; int size=0; for(p=c;*p!=0;p+) size+; size=size/2; for(q=c,p-;qc+size;q+,p-) temp=*q; *q=*p; *p=temp; （4）#include#includevoid sort(char *keyword,int size);void print(char *keyword,int size)void main() char *keyword=if,else,case,switch,do,whlie,for,break,continue; sort(keyword,9); print(keyword,9);void sort(char *keyword,int size) int i,j,min_location; char *temp; for(i=0;isize-1;i+) min_location=i; for(j=i+1;j0) min_location=j; if(min_location!=i) temp=keywordi; keywordi=keywordmin_location; keywordmin_location=temp; void print(char *keyword,int size) int i; for(i=0;isize;i+) printf(n%s,*(keyword+i);（5）#includevoid fun_char(char str1,char str2,char str3);void main() char str180,str280,str380,c,i; printf(nPlease enter 2 string:); scanf(%s%s,str1,str2); fun_char(str1,str2,str3); printf(Third string is %s.,str3);void fun_char(char *str1,char *str2,char *str3) int i,j,k,flag; i=0,k=0; while(*(str1+i)!=0) j=0; flag=1; while(*(str2+j)!=0&flag=1) if(*(str2+j)=*(str1+i) flag=0; j+; if(flag) *(str3+k)=*(str1+i); k+; i+; *(str3+k)=0;（6）#includeint count_word(char *str);void main() char str180,c,res; puts(nPlease enter a string:); gets(str1); printf(There are %d words in this sentence,count_word(str1);int count_word(char *str) int count ,flag; char *p; count=0; flag=0; p=str; while(*p!=0) if(*p= ) flag=0; else if(flag=0) flag=1; count+; p+; return count;（7）#include#includechar *encrypt(char *string);char *decrypt(char *string);main() char item80; char *point; char *pEncrypted; char *pDecrype; printf(Please enter the string need to encrypt:n); gets(item); point=item; pEncrypted=encrypt(point); printf(nThe string after encrypted is:n%sn,pEncrypted); pDecrype=decrypt(pEncrypted); printf(nThe string after decrypted is:n%sn,pDecrype); free(pEncrypted); free(pDecrype);char *encrypt(char *string) char *q,*t; q=(char *)malloc(sizeof(char)*80); if(!q) printf(No place to malloc!); return 0; t=q; while(*string!=0) *q=*string-2; string+; q+; *q=0; return t;char *decrypt(char *string) char