C语言程序设计课后习题答案吉林大学版武爱平.doc

第一章1选择题（1）B（2）C（3）C（4）D（5）B（6）D（7）D（8）C 2填空题（1）函数一个主函数函数（2）/*/（3）连接3程序设计题（1） #includemain() printf( *n); printf(* S *n); printf( *n);（2） #includemain() printf(*n); printf(Your are welcome!n); printf(-n);第二章1.选择题（1）D（2）D（3）B（4）C（5）B（6）C（7）C（8）C（9）D（10）C（11）A（12）B（13）A（14）C（15）A（16）B（17）A（18）B（19）C（20）A（21）C（22）C2填空题（1） 9 -2 62 44.8 （2） 10.5 73.1 7 7.2 （3）%6x %o%3c%10.3f%8s （4）int a,b,c; &a,&b,&c temp=a; c=temp;（5）49 613113.程序设计题（1） #includemain()double a,b,c,d;double aver=0.0;printf(nPlease input four double number:);scanf(%lf%lf%lf%lf,&a,&b,&c,&d);aver=(a+b+c+d)/4;printf(nThe average of the four double number is %lf,aver); （2） #include#define PI 3.14159main()double r;double area=0,len=0;printf(nPlease input r:);scanf(%lf,&r);area=PI*r*r;len=2*PI*r;printf(n area=%lf,length=%lf,area,len);（3）#includemain()float i,s;printf(nPlease input data:);scanf(%f%f,&i,&s);s=s*(1+i);printf(nI have %.2f yuan after one year.,s);第三章1、选择题（1）C（2）C（3）A（4）C（5）D（6）A（7）C（8）A（9）B（10）D2、填空题（1）&m,&n m=n; n=temp;m,n（2） 5 5 4 5 5 4 3 3 4（3）9 i+1%d,i printf(n);（4）73-543932013、程序设计题（1）#include#includemain() double a,b,c,d,det,a_2,real,imag,x1,x2; printf(Please enter a,b,c:); scanf(%lf%lf%lf,&a,&b,&c); if(a=0&b=0) printf(No root!n); else if(a=0) printf(Line equation root is %.2lfn,-c/b); else d=b*b-4*a*c; det=sqrt(fabs(d); a_2=2*a; if(d0) real=-b/a_2; imag=det/a_2; printf(The two root are:n%.2lf+%.2lfin,real,imag); printf(andn%.2lf-%.2lfin,real,imag); else if(d=0) printf(Single real root is %.2lf:n,-b/a_2); else x1=-b/(a_2)+det/a_2; x2=-b/(a_2)+det/a_2; printf(The two real roots are :n%.2lfn andn %.2lfn,x1,x2); （2） #includemain() int i,j; for(i=1;i=9;i+) for(j=1;j=9;j+) printf(%d*%d=%2d,i,j,i*j); printf(n); （3）#includemain() float sum,product; int i,n,j; printf(nEnter n(4=n20|n4) printf(nEnter n again:); scanf(%d,&n); sum=0; product=1; for(i=1;i=n;i+) product=1; for(j=1;j=i;j+) product=product*j; sum=sum+product; printf(1!+2!+.+%d!=%.0fn,n,sum); 第四章1、选择题（1）C（2）D（3）B（4）D（5）C（6）B（7）B（8）C（9）A（10）C（11）C（12）B2、填空题（1） int men10 ; float step4=1.9,-2.33,0,20.6; _int grid410 ;（2） int m10=9,4,7,49,32,-5; 0 9 scanf(%d,m1); m0 =39; m0 =a3+a5;（3）3 5 8 8 9 12 9（4） int a10=9,4,12,8,2,10,7,5,1,3; 09 8 8（5）103、程序填空题（1） array20 20 &arrayi 20 max=arrayi; min=arrayi; sum+arrayi; sum/20（2） -5.770000 2 1（3） ABCDEFGHIJKL EFGHIJKL ABFDEFGHIJKL ABFDEFGHI4、程序设计题（1）#define SIZE 100#includevoid main() int aSIZE+1,i,j; for(i=2;i=100;i+) ai=i; for(i=2;i=100;i+) for(j=i+1;j=100;j+) if(ai!=0&aj%ai=0) aj=0; printf(n); j=0; for(i=2;i=100;i+) if(ai!=0) printf(%-4d,ai); j+; if(j=10) j=0; printf(n); （2）#define S 14#includestdio.hvoid main() int aSS,i,j,n; printf(please enter n:); scanf(%d,&n); for(i=1;i=n;i+) aii=1; ai1=1; for(i=3;i=n;i+) for(j=2;ji;j+) aij=ai-1j-1+ai-1j; for(i=1;i=n;i+) for(j=1;j=n-i;j+) printf( ); for(j=1;j=i;j+) printf( %3d,aij); printf(n); （3）#define SIZE 80#includevoid main() char str1SIZE+SIZE,str2SIZE; int i,j; puts(Please enter 2 string:); scanf(%s,str1); scanf(%s,str2); i=0; while(str1i!=0) i+; j=0; while(str2j!=0) str1i=str2j; i+; j+; str1i=0; printf(%sn,str1);（4）#define SIZE 80#include#includevoid main() char stringSIZE; int len,i,j,flag; long number; puts(Please enter a digital string:); scanf(%s,string); len=strlen(string); if(string0=-) flag=-1; i=1; else flag=1; i=0; number=stringi-0; for(i+;ilen;i+) number=number*10+(stringi-0); number=flag*number; printf(%dn,number);（5）#define SIZE 40#includevoid main() int m,n,i,j; float priceSIZE,sum; printf(nPlease input M and N:); scanf(%d%d,&m,&n); m=m-n; printf(Please input %d price :,n); sum=0; for(i=0;i0) for(i=0;in-1;i+) pricei=pricei+1; printf(nPlease input one price:); scanf(%f,&pricen-1); m-; sum=0; for(i=0;in;i+) sum=sum+pricei; printf(Aber are %10.2f,sum/n); 第五章1.选择题（1）C（2）D（3）C（4）B（5）A（6）A（7）A（8）B（9）A（10）B（11）A（12）A2.填空题（1）整型（2）值传递 地址传递（3）全局变量 局部变量（4）自动变量 静态变量 寄存器变量 外部变量（5）自动变量（6）15 300（7）8 121（8）x=3,y=4,n=7（9）563.程序设计题（1）#includeint gcd_recursion(int a,int b);void main()int i,j;puts(nPlease enter 2 integer);scanf(%d,%d,&i,&j);if(i0|j0) puts(nData Error!Please enter 2 integer); scanf(%d, %d,&i,&j);elseprintf(gcd(%d,%d)=%d,i,j,gcd_recursion(i,j);int gcd_recursion(int a,int b) int c,d; if(ab) c=a; a=b; b=c; if(a%b=0) return b; else d=gcd_recursion(b,a%b); else if(a%b=0) return b; else d=gcd_recursion(b,a%b); return d;（2）#includeint delete_char(char c,char str);void main()char str10,c,i; puts(nPlease enter a string:); gets(str); puts(Please enter a char you want to delete:); c=getchar(); puts(Before deleted:); puts(str);puts(After deleted:);i=delete_char(c,str);puts(str);printf(There are %d characters deleted.,i);int delete_char(char c,char str) int i,j,total,k,sum; i=0; total=0; while(stri!=0) k=i; sum=0; while(strk=c) k+; sum+; total=total+sum; if(stri=c) for(j=i;strj+sum!=0;j+) strj=strj+sum; strj=0; i+; return total; （3） #include int max(int a,int b);void main() int i,j,k; puts(nPlease enter 3 integer:); scanf(%d,%d,%d,&i,&j,&k); printf(max is %d.,max(max(i,j),k);int max(int a,int b) if(ab) return a; else return b;（4） #includevoid int_string(long a,char str);void reverse(char c,int size);void insert_space(char c,int size);void main() long i; char str110; puts(nPlease enter 1 long interger:); scanf(%d,&i); int_string(i,str1); printf(digital string is %s,str1);void int_string(long a,char str) int i=0; while(a!=0) stri=a%10+0; a=a/10; i+; stri=0; insert_space(str,i);void insert_space(char c,int size) int i; c2*size-1=0; for(i=2*(size-1);i=2;i-=2) ci=ci/2; ci-1= ; （5）#includelong facto(long x);main() int a; long factorial; printf(nPlease enter a integer:); scanf(%d,&a); factorial=facto(a); printf(nThe %ds jieceng is :%ldn,a,factorial);long facto(long x) if(x=1) return 1; else return(x*facto(x-1);（6）#includefloat average(float math,float chinese,float english);main() float score3; float aver; printf(Please enter your score:math,chinese,englishn); scanf(%f,%f,%f,&score0,&score1,&score2); aver=average(score0,score1,score2); printf(Your average is %.2fn,aver);float average(float math,float chinese,float english) return(math+chinese+english)/3;（7）#includefloat max=0,min=0;float average(float arr,int n) int i; float aver,sum=arr0; max=min=arr0; for(i=1;imax) max=arri; else if (arrimin) min=arri; sum=sum+arri; aver=sum/n; return(aver);main() float score10, aver; int i; printf(Please enter ten score:); for(i=0;i10;i+) scanf(%f,&scorei); aver=average(score,10); printf(max=%.2fnmin=%.2fnaverage=%.2fn,max,min,aver);（8）#includeint fib(int n) if(n=1|n=2) return 1; else return(fib(n-1)+fib(n-2);void main() int i; printf(n); for(i=1;i20;i+) printf(%-12d,fib(i); if(i%5=0) printf(n); 第六章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 *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; 第七章1、选择题（1）D（2）D（3）D（4）C（5）D（6）C（7）C（8）B（9）C（10）C（11）B（12）C（13）B（14）A（15）A（16）C2、程序分析题（1） Ling ning:19