C简明教程天津大学出版社课后习题答案.doc

1-7-1/输出一个数的10倍#include using namespace std;int main()couta;coutresult=a*10endl;return 0;1-7-2/输出两个数中的较小的#include using namespace std;int main()double x,y,min;coutplease input two numbersxy;min=(xy?y:x);coutthe smaller is minendl;return 0;1-7-3/输入半径计算周长和面积#include using namespace std;int main()coutrad;double c,s;c=2*3.14*rad;s=3.14*rad*rad;cout周长是cendl;cout面积是sendl;return 0;1-7-4/将10000秒化成小时分钟秒#include using namespace std;int main()int hour,min,second;hour=10000/3600;min=(10000%3600)/60;second=10000-hour*3600-60*min;couthourhoursminminutessecondsecondsendl;return 0;1-7-5/将一个三位数倒叙输出#include using namespace std;int main()int num,num_bai,num_shi,num_ge;coutnum;num_bai=num/100;num_shi=(num-num_bai*100)/10;num_ge=num-num_bai*100-num_shi*10;coutnum_geendl;coutnum_shiendl;coutnum_baiendl;return 0;2-3/简单的输入输出#include using namespace std;int main()double y,n;coutn;if (n0) y=n+1;if (n0) y=n*n;if (n=0) y=0;coutthe result is: y;return 0;2-4/输出学生学号和对应的成绩等级#include using namespace std;int main()double fenshu;int xuehao;char dengji;int i;for (i=1;i=10;i+)onerror:coutfenshu;if (fenshu=90&fenshu=80&fenshu=600&fenshu=0&fenshu60) dengji=D;if (fenshu0)cout100)couterror;goto onerror;coutthe id isiendl;coutthe score isdengjiendl;return 0;2-5/判断输入字符类别#include using namespace std;int main()char zifu;int ascii;coutzifu;ascii=zifu;if (ascii=48&ascii=57) cout=97&ascii=122)cout=65&ascii=90)cout大写字母n;goto end;cout其他字符;coutendl;end:return 0;2-6/求圆周率的近似值#include #include using namespace std;int main()int xishu=-1;double danshu=1.0;int i=1;double sifenzhipi=0;doxishu=xishu*(-1);danshu=1.0/(2*i-1);sifenzhipi=sifenzhipi+xishu*danshu;i+;while(danshu=0.000001);coutsetprecision(15)sifenzhipi*4endl;return 0;2-7/输出斐波那契数列前40个数，以8*5的格式输出#include #include using namespace std;int main()int b=2;int feibo1=0;int feibo2=1;coutsetw(9)0setw(9)1;for(int i=1;i=38;i+)int a=feibo2;feibo2=feibo1+feibo2;feibo1=a;coutsetw(9)feibo2;b=b+1;if(b%8=0) coutendl;return 0;2-8/统计输入的元音字母个数#include using namespace std;int main()char zimu;int a,e,i,o,u;a=e=u=i=o=0;begin:cinzimu;switch(zimu)case a :a+;break;case e :e+;break;case i :i+;break;case o :o+;break;case u :u+;break;case # :goto end;goto begin;end:coutaendleendliendloendluendla+e+i+o+u;return 0;2-10/计算5!+6!+7!#include using namespace std;int main()int i,j;int sum=0;for (i=5;i=7;i+)int jiecheng=1;for (j=1;j=i;j+) jiecheng=jiecheng*j;sum=sum+jiecheng;coutsum;return 0;2-11/从2开始100个素数#include using namespace std;int main()int num=1;int sushu=0;start:;num+;for (int i=2;i=num;i+)if(num%i=0) break;if (i=num)coutnumendl;sushu+=1;if(sushu!=100) goto start;return 0;2-12/百钱买百鸡问题#include using namespace std;int main()int x,y,z;for(x=0;x=100;x+)for(y=0;y=100;y+)for(z=0;z=100;z+)if (x+y+z=100&5*x+3*y+z/3=100&z%3=0) coutxtytzendl;return 0;2-13#include using namespace std;int main()int a,b,c,d,e;c=0;cina;cout输入aendl该数的三次方是a个连续奇数;b=1;e=a*a*a;while (c!=e)d=b;c=0;for (int i=1;i=a;i+)c=c+d;d=d+2;b=b+2;/coutb-2;int f=b-4;for (int j=1;j=a;j+)f=f+2;coutf ;cout的和n;return 0;2-14/输出四方*形状#include using namespace std;int main()int i,j;for (i=1;i=9;i+)j=1;for(j=1;j=6&i+j=14&j-i=4&i-j=4) cout*;else cout ;coutendl;return 0;3-1-1/向数组a中输入10个整数，求其中的最大值，最小值和10个数的算术平均值#include using namespace std;int main()int a10;for(int i=0;iai;int max=a0,min=a0,sum=a0;for(int j=0;jaj?max:aj);min=(minaj?min:aj);double ave=sum/10.00;coutmaxendlminendlaveendl;return 0;3-1-2#include using namespace std;int main()int score10;int sum=0,a=0,b=0;for(int i=0;iscorei;sum=sum+scorei;double ave=sum/10.0;for(int j=0;jave) a+;if(scorej60) b+;cout成绩大于平均值的人数是aendl成绩小于60的人数bendl;return 0;3-3-1#include using namespace std;int main()int a10,sum=0,min,max;double ave;int *ptoa=a;for (int i=0;i*(a+i);sum+=*(a+i);min=*(a);max=*(a);for (int j=1;j=9;j+)min=(min*(a+j)?max:*(a+j);coutmaxendlminendl;ave=sum/10.0;coutaveendl;return 0;3-3-2#include using namespace std;int main()int a10,sum=0,j=0,c=0;/定义数组a，sum是各学生成绩之和，j是小于60的个数，c是大于平均值的个数double ave=0;/定义平均值int *ptoa=a;/使用指针for (int i=0;i*(ptoa+i);sum+=*(ptoa+i);if (*(ptoa+i)60)j+;ave=sum/10.0;/计算平均值/coutaveendl;/可以输出平均值for (int k=0;kave)c+;coutcendlj;return 0;3-3-3#include using namespace std;int main()char string100;cinstring;int i=0,an=0,in=0;cout您输入的字符串;while (stringi!=0)if(stringi=a) an+;if(stringi=i) in+;coutstringi;i+;coutendlanendlinendl;return 0;3-3-3a#include using namespace std;int main()char a100;/定义存放字符串的数组char *ptoa=a;/使用指针int i=0,an=0,in=0;/an，in分别为a，i的个数cina;while (*(ptoa+i)!=0)/a【i】cout*(ptoa+i);switch (*(ptoa+i)/判断case a : an+;break;case i : in+;break;i+;coutendlanendlin;return 0;3-3-4#include using namespace std;int main()int a33;for (int i=0;i=2;i+)for(int j=0;j*(*(a+i)+j);cout*(*(a+0)+0)+*(*(a+1)+1)+*(*(a+2)+2)endl;cout*(*(a+0)+2)+*(*(a+1)+1)+*(*(a+2)+0)endl;return 0;3-3-5v1#include using namespace std;int main()int a11=2,4,5,8,12,14,16,18,20,30,0,b,i,m,j;cinb;a10=b;if (b30)goto end2;for(i=0;ib)m=i+1;goto end;end:;for (j=10;j=m+1;j-)aj=aj-1;am=b;end2:;for (int k=0;k=10;k+)coutakendl;return 0;3-3-5v2#include using namespace std;int main()int i,j,temp;int a11=2,4,5,8,12,14,16,18,20,30;cina10;for (i=0;i=10;i+)for(j=0;jaj+1)temp=aj+1;aj+1=aj;aj=temp;for (int k=0;k=10;k+) coutak ;coutn;return 0;3-3-5v3#include using namespace std;int main()int a11=2,4,5,8,12,14,16,18,20,30,num,i,j;coutnum;if (numa9)a10=num;elsefor (i=0;inum)for(j=9;j=i;j-)aj+1=aj;ai=num;break;for (i=0;i=10;i+)coutai ;return 0;3-3-5final#includevoid main()int a11=2,4,5,8,12,14,16,18,20,30,b,i=0,j=10;cinb;while(aib&ii)aj=aj-1;j-;ai=b;cout输入插入后的结果：;for(i=0;i11;i+)coutai ;coutendl;3-3-6#include using namespace std;int main()int a53,s5=0,0,0,0,0,temp;for (int i=0;i=4;i+)cout请输入第i+1行的数据endl;for (int j=0;j*(*(a+i)+j);*(s+i)+=*(*(a+i)+j);/*/注释掉的部分可以输出每行数据之和for (int k=0;k=4;k+)cout*(s+k)endl;*/for (int m=0;m=4;m+)for (int n=0;n*(s+n+1)temp=*(s+n+1);*(s+n+1)=*(s+n);*(s+n)=temp;for (int l=0;l=4;l+)coutendl*(s+l);coutendl;system(pause);return 0;4-3#include using namespace std;int fun1(int x,int y);int fun2(int x,int y);int fun3(int x,int y);int fun4(int x,int y);int main()int a,b;coutab;cout两个数的和的平方是fun1(a,b)endl;cout两个数的平方和是fun2(a,b)endl;cout两个数的差的平方是fun3(a,b)endl;cout两个数平方的差是fun4(a,b)endl;return 0;int fun1(int x,int y)int z=(x+y)*(x+y);return z;int fun2(int x,int y)int z=x*x+y*y;return z;int fun3(int x,int y)int z=(x-y)*(x-y);return z;int fun4(int x,int y)int z=x*x-y*y;return z;4-4#include using namespace std;double jc(int x);int sm(int x);int main()int m,n,s2;double s1;cinmn;s1=jc(m)/(jc(n)*jc(m-n);s2=sm(m)-sm(n);couts1endls2;return 0;double jc(int x)double s=1;for (int i=1;i=x;i+) s*=i;return s;int sm(int x)int s=0;for (int i=1;i=x;i+) s+=i;return s;4-6#include #include using namespace std;double jxf(int n);double txf(int n);double f(double x);/const pi=3.1415927;int main()int n;double y1,y2;cinn;y1=jxf(n);y2=txf(n);couty1endly2;return 0;double jxf(int n)double sum=0,s;for (int i=0;i=n-1;i+)s=(i*3.14)/n;sum+=(3.14/n)*f(s);return sum;double txf(int n)double sum=0,s1,s2;for (int i=0;i=n-1;i+)s1=i*3.14/n;s2=(i+1)*3.14/n;sum+=3.14/n*(f(s1)+f(s2);sum/=2.0;return sum;double f(double x)double y;y=sin(x)+cos(x);return y;4-6v1#include #include using namespace std;double jxf(int n);double txf(int n);double f(double x);const pi=3.1415927;int main()int n;double y1,y2;cinn;y1=jxf(n);y2=txf(n);if (abs(y1-2)abs(y2-2) cout矩形法;else cout梯形法;return 0;double jxf(int n)double sum=0;for (int i=0;i=n-1;i+) sum+=pi/n*f(i*pi/n);return sum;double txf(int n)double sum=0;for (int i=0;i=n-1;i+) sum+=pi/n*(f(i*pi/n)+f(i+1)*pi/n);sum/=2;return sum;double f(double x)double y;y=sin(x)+cos(x);return y;4-6v2error#include #include using namespace std;double jxf(int n);double txf(int n);double f(double x);const pi=3.1415927;int main()int n;double y1,y2;cinn;y1=jxf(n);y2=txf(n);if (abs(y1-2)abs(y2-2) cout矩形法;else cout梯形法;return 0;double jxf(int n)double sum=0;for (int i=0;i=n-1;i+) sum+=pi/n*f(i*pi/n);return sum;double txf(int n)double sum=0;for (int i=0;i=n-1;i+) sum+=pi/n*(f(i*pi/n)+f(i+1)*pi/n);sum/=2;return sum;double f(double x)double y;y=sin(x)+cos(x);return y;4-7#include using namespace std;int my(int x,int y);int mb(int x,int y);int main()int a,b,max,min;cinab;max=my(a,b);min=mb(a,b);coutmaxendlminy?y:x);i=1;i-)if (x%i=0&y%i=0) return i;int mb(int x,int y)for (int i=(xy?x:y);i=1;i+)if (i%x=0&i%y=0) return i;4-11#include using namespace std;void delchar(char *s1,char s2);int main()char s1100;char s2;cins1s2;delchar(s1,s2);return 0;void delchar(char *s1,char s2)for (int i=1;*(s1+i)!=0;i+)if (*(s1+i)=s2)for (int j=0;*(s1+i+j)!=0;j+)*(s1+i+j)=*(s1+i+j+1);couts1;4-12#include #include using namespace std;int check(int a,int b,int c);double s(double a,double b,double c);int main()double a,b,c;cinabc;if (check(a,b,c) couts(a,b,c);else coutc&abs(a-b)c) return 1;else return 0;double s(double a,double b,double c)double p=(a+b+c)/2;double area=sqrt(p*(p-a)*(p-b)*(p-c);return area;4-13#include #include using namespace std;fun (int n,int k);pow10 (int x);int main()int n,k;cinnk;coutfun(n,k)n|k1) return 0;else int s;s=n/pow10(k-1);s=s%10;return s;int pow10 (int x)int s=1;for (int i=1;i=x;i+) s*=10;return s;4-14#includeusing namespace std;double ave(int p4,int i);int main()int a54;for (int i=0;i=4;i+)for (int j=0;jaij;for (i=0;i=4;i+)coutave(a,i)endl;system(pause);return 0;double ave(int p4,int i)double sum=0;for(int j=0;j=3;j+)sum+=pij;sum/=4;return sum;4-15#include using namespace std;int find(char str,char a);int main()char str100,a;cinstra;coutfind(str,a)+1;system(pause);return 0;int find(char str,char a)for (int i=0;stri!=0;i+)if (stri=a) return i;break;if (stri=0) return -1;4-16/4_16#includeusing namespace std;int change (int n,int R,int *a);int main()coutPlease input n and R(2=R=16)nR;int i=change(n,R,a);for (int j=i-1;j=0;j-)switch (aj)case 11:coutA;break;case 12:coutB;break;case 13:coutC;break;case 14:coutD;break;case 15:coutE;break;default: coutaj;system(pause);return 0;int change (int n,int R,int *a)int i=0;while (n!=0)*(a+i)=n%R;n/=R;i+;return i;4-17#include using namespace std;const int N=5;int init(int aN);void fun1(int aN);void fun2(int aN);void fun3(int aN,int sum);void fun4(int aN);int main()int sum=0;int a2N;sum=init(a);cout(1)endl;fun1(a);cout(2)endl;fun2(a);cout(3)endl;fun3(a,sum);cout(4)endl;fun4(a);return 0;int init(int aN)int sum=0;for (int i=0;ia1i;sum+=a1i;return sum;void fun1(int aN)for (int i=0;i85)couta0i a1iendl;void fun2(int aN)for (int i=0;i=N-1;i+)if (a1i60)couta0i a1iendl;void fun3(int aN,int sum)int aveplus=0;double ave=sum/N;for (int i=0;i=ave)aveplus+;coutaveplusendl;void fun4(int aN)for (int i=0;i=N-1;i+)for (int j=0;ja1j+1)int temp1=a1j+1;a1j+1=a1j;a1j=temp1;int temp2=a0j+1;a0j+1=a0j;a0j=temp2;for (i=0;i=N-1;i+)couta0i a1iendl;5-5/计算当前日期是一年之中的第几天#include using namespace std;/定义日期类class Dateprivate:/y年 m月 d天 nod一年中的第几天 ly是否是闰年int y,m,d,nod,ly;public:Date (int ioy=2009,int iom=5,int iod=1)y=ioy;m=iom;d=iod;int checkdate();int Issleapyear();void Print();int NumberOfDays();/是否是闰年int Date:Issleapyear()return ly=(y%400=0)|(y%4=0&y%100!=0);/计算一年之中的第几天int Date:NumberOfDays ()int a213=0,31,29,31,30,31,30,31,31,30,31,30,31,0,31,28,31,30,31,30,31,31,30,31,30,31;nod=0;for (int i=0;i0&m0&d=31);/输出void Date:Print ()couty年m月d日是该年的第NumberOfDays ()天endl;/主函数int main()Date d1;Date d2(1991,5,2);int y,m,d;coutymd;Date d3(y,m,d);d1.Print();d2.Print();if(d3.checkdate() d3.Print();elsecoutError;system(pause);system(cls);system(pause);return 0;5-6/判断15，31是否偶数，素数#include using namespace std;/定义整数类class Inter