c01.cpp

一个”学生作业“的C++大程序。有菜单

void myfunction();
int x=5,y=7;
void san()
{
	cout<<"x from main:"<<x<<"\n";
	cout<<"y from main:"<<y<<"\n\n";
	myfunction();
	cout<<"back from myfunction!\n\n";
	cout<<"x from main:"<<x<<"\n";
	cout<<"y from main:"<<y<<"\n";
}
void myfunction()
{
	int y=10;

	cout<<"x from main:"<<x<<"\n";
	cout<<"y from main:"<<y<<"\n\n";
}
class cat
{
 public:
	cat(int xx=0,int yy=0,int zz=0)    {X=xx;Y=yy;Z=zz;howmanycatsc++;}
	cat(cat&c);
	~cat(){howmanycatsc--;}
	int gethowmanycX()  {return X;}
	int gethowmanycY()  {return Y;}
	int gethowmanycZ()  {return Z;}
	static void gethowmanyc() {cout<<"get how many cats:"<<howmanycatsc<<endl;}
 private:
	int X,Y,Z;
	static int howmanycatsc;
};
cat::cat(cat&c)
{
	X=c.X;
    Y=c.Y;
    Z=c.Z;
    howmanycatsc++;
}
int cat::howmanycatsc=0;
void diqi()
{
    cat A(1);
    cout<<"cat A:"<<A.gethowmanycX()<<endl;
    A.gethowmanyc();
    cat B(A);
    cout<<"cat B:"<<B.gethowmanycX()<<endl;
    cat::gethowmanyc();
    cat C(B);
    cout<<"cat C:"<<C.gethowmanycX()<<endl;
    cat::gethowmanyc();
}
void fn2()
{
    int n=5;
}
int n;
void shiyi()
{
    int n=10;
    fn2();
    cout<<"n="<<n<<endl;
}
void fn1()
{
    static int n=10;
    n++;
    cout<<"n="<<n<<endl;
}
void shier()
{
	int i;
    for(i=0;i<10;i++)
    fn1();
}
class boat
{
 public:
	 boat(int yy=0)     {Y=yy;}
	 int boatweight()   {return Y;}
	 friend class car;
     friend int totalweight(boat&m,car&n);
 private:
	 int Y;
};
class car
{
 public:
	car(int xx=0)    {X=xx;}
	int carweight()   {return X;}
	friend int totalweight(boat&m,car&n);
 private:
	int X;
};
int totalweight(boat&b1,car&c1)
{
	return int(b1.Y+c1.X);
}
void fourteen()
{
    int bb,cc;
    cout<<"please input the weight of the boat:"<<endl;
    cin>>bb; 
    boat myb1(bb);
    cout<<"please input the weight of the car:"<<endl;
    cin>>cc;
    car myc1(cc);
    cout<<"the totalweight is:"<<totalweight(myb1,myc1)<<endl;
}
void diwuzhang()
{
    int c;
	cout<<"======请问，您想看哪道题：======="<<endl;
	cout<<"==========第3题=================="<<endl;
	cout<<"==========第7题=================="<<endl;
	cout<<"==========第11题================="<<endl;
	cout<<"==========第12题================="<<endl;
	cout<<"==========第14题================="<<endl;
    cout<<"==========0（返回主菜单）========"<<endl;
	cin>>c;
	switch(c)
	{
	  case 3: san();         diwuzhang();    break;
	  case 7: diqi();        diwuzhang();    break;
	  case 11: shiyi();      diwuzhang();    break;
	  case 12: shier();      diwuzhang();    break;
      case 14: fourteen();   diwuzhang();    break;
	  case 0:                                break;
	}
}
void four()
{
    int onearray[]={1,2,3,4,5,6,7,8};
    int i;
    cout<<"the data of onearray[] is:"<<endl;
    for(i=0;i<sizeof(onearray)/sizeof(int);i++)
    cout<<onearray[i]<<endl;
    cout<<"there are"<<" "<<sizeof(onearray)/sizeof(int)<<" "<<"numbers."<<endl;
}
void wu()
{
	int a[5][3]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
	int i,j;
	cout<<"the data of a[5][3] is:"<<endl;
	for(i=0;i<5;i++)
		for(j=0;j<3;j++)
			cout<<a[i][j]<<endl;
}
void seventeen()
{
    int *p;
    int i;
    p=&i;
    i=9;
    cout<<"the value at p:"<<*p<<endl;
}
int fn3();
void eighteen()
{
	int a=fn3();
    cout<<"the value of a is:"<<a<<endl;
}
int fn3()
{
    int *p=new int(5);
    return *p;
}
class simplecircle
{
 public:
	void setradius(double r=0);
	void getarea();
 private:
	double *radius,s;
};
void simplecircle::setradius(double r)
{
	radius=&r;
	s=3.14159*r*r;
}
void simplecircle::getarea()
{   
	cout<<"圆的面积是:"<<s<<endl;
}
void twenty()
{ 
    simplecircle mycircle;
    double r1;
    cout<<"请输入圆的半径:"<<endl;
    cin>>r1;
    mycircle.setradius(r1);
    mycircle.getarea();
}
int count(char *str)
{
	int i,n=0;
	for(i=0;i<str[i];i++)
	{
		if((str[i]>='a'&&str[i]<='z')||
			(str[i]>='A'&&str[i]<='Z'))
			n++;
	}

return n;
}
void twentyfirst()
{
	int h;
		 char A[50];
		 cout<<"请输入一条英文句子:"<<endl;
		 gets(A);
		 h=count(A);
		 cout<<"字母的个数是:"<<h<<endl;
}

void twentytwo()
{
	int a,b,i,j;
	a=0,b=0,i=0,j=0;
	char s[100],t[100];
	char s1,t1;
	cout<<"请输入字符串s,以#结尾"<<endl;
    do
	{ 	cin>>s1;
		 s[i]=s1;
		 i++;
	}while(s1!='#');
	cout<<"请输入字符串t,以#结尾"<<endl;
	do
	{  cin>>t1;
		t[j]=t1;
		j++;
	}while(t1!='#');
	while((t[b]!='#')&&(s[a]!='#'))
	{
		if(s[a]==t[b])     {  a++;  b++;}
		else        {  b=0;  a=a-b+1;  }
	}
	if(t[b]=='#')    
		cout<<"字符串t在字符串s中首次出现的位置是："<<a-b+1<<endl;
	else    
		cout<<"字符串t不存在！"<<endl;
}
void reverse(char *s,char *t)
{
	char ch;
	if(s<t)
	{
		ch=*s;*s=*t;*t=ch;
		reverse(++s,--t);
	}
}
void reverse(char *s)
{
	reverse(s,s+strlen(s)-1);
}
void twentythree()
{
	char str[20];
		 cout<<"请输入一个字符串:";
		 cin>>str;
		 cout<<"这个字符串是:"<<str<<endl;
		 reverse(str);
		 cout<<"转置字符串是:"<<str<<endl;
}
          
void diershiliu()
{
	int i,j;
    int a[3][3];
	cout<<"input 9 numbers:"<<endl;
	for(i=0;i<3;i++)
		for(j=0;j<3;j++)
			cin>>a[i][j];
	cout<<"the a[3][3] is:"<<endl;
	for(i=0;i<3;i++)
	{	
		for(j=0;j<3;j++)
		{cout<<a[i][j]<<" ";}
	     cout<<endl;
	}
	cout<<"the reverse of a[3][3] is:"<<endl;
	for(j=0;j<3;j++)
	{
		for(i=0;i<3;i++)
		{cout<<a[i][j]<<" ";}
		cout<<endl;
	}
}
void twentyseven()
{
	int i,j,m,n;
    int a[10][10];
	cout<<"请问，你想输入几行："<<endl;
    cin>>m;
    cout<<"请问，你想输入几列："<<endl;
	cin>>n;
	cout<<"现在，请输入"<<" "<<m*n<<" "<<"个元素："<<endl;
	for(i=0;i<m;i++)
		for(j=0;j<n;j++)
			cin>>a[i][j];
	cout<<"这个矩阵是："<<endl;
	for(i=0;i<m;i++)
	{	
		for(j=0;j<n;j++)
		{cout<<a[i][j]<<" ";}
	     cout<<endl;
	}
	cout<<"转置矩阵是："<<endl;
	for(j=0;j<n;j++)
	{
		for(i=0;i<m;i++)
		{cout<<a[i][j]<<" ";}
		cout<<endl;
	}
}
void diliuzhang()
{
    int c;
	cout<<"====请问，您想看哪道题：======="<<endl;
	cout<<"========第4题=================="<<endl;
    cout<<"========第5题=================="<<endl;
    cout<<"========第17题================="<<endl;
	cout<<"========第18题================="<<endl;
	cout<<"========第20题================="<<endl;
    cout<<"========第21题================="<<endl;
	cout<<"========第22题================="<<endl;
	cout<<"========第23题================="<<endl;
    cout<<"========第26题================="<<endl;
    cout<<"========第27题================="<<endl;
	cout<<"========0（返回主菜单）========"<<endl;
	cin>>c;
	switch(c)
	{
	  case 4: four();          diliuzhang();      break;
	  case 5: wu();            diliuzhang();      break;
	  case 17: seventeen();    diliuzhang();      break;
	  case 18: eighteen();     diliuzhang();      break;
	  case 20: twenty();       diliuzhang();      break;
      case 21: twentyfirst();  diliuzhang();      break;
      case 22: twentytwo();    diliuzhang();      break;
      case 23: twentythree();  diliuzhang();      break;
      case 26: diershiliu();   diliuzhang();      break;
      case 27: twentyseven();  diliuzhang();      break;
	  case 0:                                     break;
	}
}


void main()
{
   int c;
   do
   {
	   cout<<"======请问，您想看哪章的题:======"<<endl;
       cout<<"==========第2章=================="<<endl;
       cout<<"==========第3章=================="<<endl;
       cout<<"==========第4章=================="<<endl;
       cout<<"==========第5章=================="<<endl;
       cout<<"==========第6章=================="<<endl;
       cout<<"==========0(退出)================"<<endl;
       cin>>c;
       switch(c)
	   {
	     case 2: dierzhang();      break;
         case 3: disanzhang();     break;
         case 4: disizhang();      break;
         case 5: diwuzhang();      break;
         case 6: diliuzhang();     break;
	   }
   }while(c!=0);    
    cout<<"谢谢使用。"<<endl;
}