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#include <iostream>
using namespace std;
double p7_1();
int p7_2enter(double score[]);
void p7_2show(double score[], int num);
double p7_2ave(double score[], int num);
struct box
{
char maker[40];
float height;
float width;
float length;
float volume;
};
void p7_3show(box a);
void p7_3setv(box *p);
double p7_4(unsigned numbers, unsigned picks, unsigned senumbers);
long p7_5(int n);
int p7_6Fill_array(double execute[], int num);
void p7_6Show_array(double execute[], int num);
void p7_6Reverse_array(double execute[], int num);
double* p7_7fill_array(double ar[], int limit);
void p7_7show_array(const double ar[], double* last);
void p7_7revalue(double r, double ar[], double* last);
const int Seasons = 4;
const char* Snames[Seasons] = {"Spring", "Summer", "Fall", "Winter"};
struct Expenses
{
double expense;
};
void p7_8fill(double ar[], const int Seasons);
void p7_8fill2(Expenses ar[], const int Seasons);
void p7_8show(double ar[], const int seasons);
void p7_8show2(Expenses ar[], const int seasons);
const int SLEN = 30;
struct student
{
char fullname[SLEN];
char hobby[SLEN];
int opplevel;
};
int p7_9getinfo(student pa[], int n);
void p7_9display1(const student st);
void p7_9display2(const student *st);
void p7_9display3(const student[], int n);
double p7_10caculate(double, double, double (*p)(double, double));
double p7_10add1(double,double);
double p7_10add2(double,double);
double p7_10add3(double,double);
int main()
{
// 7.1 double ave = p7_1();
// while(1)
// {
// if (ave == -1)
// break;
// cout << "the harmonic average of the two number is: " << ave;
// cout << endl;
// ave = p7_1();
// }
//7.2 double scores[10]={0};
// int num;
// double ave;
//
// num = p7_2enter(scores);
// p7_2show(scores, num);
// ave = p7_2ave(scores, num);
// cout << "The average of your scores is: " << ave << endl;
//7.3 box haha = {"adidas", 10.0f, 20.0f, 30.0f};
// p7_3setv(&haha);
// p7_3show(haha);
// unsigned numbers, picks, senumbers;
// double P;
// cout << "Please enter the first numbers, picks and second numbers(q to quit):\n";
// while(cin >> numbers >> picks >> senumbers)
// {
// P = p7_4(numbers, picks, senumbers);
// cout << "The rate you win is: " << P << endl;
// cout << "next two three numbers (q to quit):\n";
// }
//7.5 int n;
// long answer;
// cout << "Enter a integer, and I will give you the factorial: " << endl;
// while(cin >> n)
// {
// answer = p7_5(n);
// cout << "The answer is: " << answer << endl;
// cout << "next: " << endl;
// }
// const int num = 10;
// double test[num];
// int counter;
// counter = p7_6Fill_array(test, num);
// p7_6Show_array(test, counter);
// p7_6Reverse_array(test, counter);
// p7_6Show_array(test, counter);
// const int Max = 5;
// double properties[Max];
// double* endp = p7_7fill_array(properties, Max);
// p7_7show_array(properties, endp);
// if (endp > properties )
// {
// cout << "Enter revaluation factor: ";
// double factor;
// while(!(cin >> factor))
// {
// cin.clear();
// while (cin.get() != '\n')
// {
// continue;
// }
// }
// p7_7revalue(factor, properties, endp);
// p7_7show_array(properties, endp);
// }
// cout << "Done!\n";
// cin.get();
// cin.get();
//7.8 double expenses[Seasons];
// Expenses expenses2[Seasons];
// p7_8fill(expenses, Seasons);
// cout << "next kind of array:\n";
// p7_8fill2(expenses2, Seasons);
//
// p7_8show(expenses, Seasons);
// cout << "next kind of array:\n";
// p7_8show2(expenses2, Seasons);
//7.9 cout << "Enter class size: ";
// int class_size;
// cin >> class_size;
// while (cin.get() != '\n')
// continue;
// student * ptr_stu = new student[class_size];
// int entered = p7_9getinfo(ptr_stu, class_size);
// cout << endl;
// for (int i = 0; i < entered; i++)
// {
// p7_9display1(ptr_stu[i]);
// p7_9display2(&ptr_stu[i]);
// cout << endl;
// }
// p7_9display3(ptr_stu, entered);
// delete [] ptr_stu;
// cout << "Done!\n";
double a, b;
cout << "Enter two numbers, and I will give you some kind of add include them:\n";
cout << "q to quit:\n";
double (*padd[3])(double, double) = {p7_10add1, p7_10add2, p7_10add3};
int slecter = 0;
double answer;
while (cin >> a >> b)
{
answer = p7_10caculate(a, b, padd[slecter % 3]);
++slecter;
cout << "This time, add of the two number is: " << answer << endl;
}
return 0;
}
double p7_1()
{
double x,y;
double ave;
cout << "please enter 2 numbers:\n";
cin >> x >> y;
ave = x*y;
if (0 == ave)
{
cout << "IO termination, return -1:";
return -1.0;
}
ave = 2.0*ave / (x+y);
return ave;
}
int p7_2enter(double score[])
{
cout << "Please enter you scores, no more than 10, q to end early: " << endl;
int i = 0;
int count = 0;
while (cin >> score[i])
{
++count;
if (count >= 10)
break;
i++;
}
return count;
}
void p7_2show(double score[], int num)
{
cout << "this is your scores:\n";
for (int i =0; i<num; i++)
{
cout << score[i] << " ";
}
cout << endl;
return;
}
double p7_2ave(double score[], int num)
{
double sum = 0;
for (int i = 0; i<num; i++)
{
sum += score[i];
}
return sum/num;
}
void p7_3show(box a)
{
cout << "maker: " << a.maker << endl;
cout << "height: " << a.height << endl;
cout << "length: " << a.length << endl;
cout << "width: " << a.width << endl;
cout << "volume: " << a.volume << endl;
}
void p7_3setv(box *p)
{
p->volume = p->height*p->length*p->width;
}
double p7_4(unsigned numbers, unsigned picks, unsigned senumbers)
{
double p = 1.0;
unsigned i;
for (i = 1; i<=picks; i++, numbers--)
p = p * double(numbers) / double(i);
p = (1.0 / p) * (1.0 / senumbers);
return p;
}
long p7_5(int n)
{
static long m = 1;
if(n == 0)
return 1;
else
m = n*p7_5(n-1);
return m;
}
int p7_6Fill_array(double execute[], int num)
{
int count = 0;
cout << "enter the double number(q to quit): " << count+1 << endl;
while (cin >> execute[count])
{
count ++;
if (count >= num)
{
cout << "too much!!" << endl;
break;
}
cout << "enter the double number(q to quit):" << count+1 << endl;
}
return count;
}
void p7_6Show_array(double execute[], int num)
{
int i = 0;
cout << "This is your array: " << endl;
for (; i<num; i++)
{
cout << execute[i] << ' ';
}
cout << endl;
}
void p7_6Reverse_array(double execute[], int num)
{
double temp;
int i = 0;
num -=1;
for (; i< num; i++, num--)
{
temp = execute[i];
execute[i] = execute[num];
execute[num] = temp;
}
}
double* p7_7fill_array(double ar[], int limit)
{
double temp;
int i;
for(i = 0; i < limit; i++)
{
cout << "Enter value #" << (i + 1) << ": ";
cin >> temp;
if (!cin)
{
while(cin.get() != '\n')
continue;
cout << "bad input; input process terminated.\n";
break;
}
else if(temp < 0)
break;
ar[i] = temp;
}
cout << endl;
return (ar + i-1);
}
void p7_7show_array(const double ar[], double* endp)
{
int i;
for (i =0; (ar+i) <= endp; i++)
{
cout << "Property #" << (i+1) << ": $";
cout << *(ar+i) << endl;
}
}
void p7_7revalue(double r, double ar[], double* endp)
{
for (int i =0; (ar+i)<= endp; i++)
ar[i] = r;
}
void p7_8fill(double ar[], const int Seasons)
{
for ( int i = 0; i<Seasons; i++)
{
cout << "Enter " << Snames[i] << " expenses: ";
cin >> ar[i];
}
}
void p7_8show(double ar[], const int seasons)
{
double total = 0;
cout << "\n EXPENSES\n";
for (int i = 0; i<Seasons; i++)
{
cout << Snames[i] << ": " << ar[i] << endl;
total += ar[i];
}
cout << "Total: " << total << endl;
}
void p7_8fill2(Expenses ar[], const int Seasons)
{
for ( int i = 0; i<Seasons; i++)
{
cout << "Enter " << Snames[i] << " expenses: ";
cin >> ar[i].expense;
}
}
void p7_8show2(Expenses ar[], const int seasons)
{
double total = 0.0;
cout << "\n EXPENSES\n";
for (int i = 0; i<Seasons; i++)
{
cout << Snames[i] << ": " << ar[i].expense<< endl;
total += ar[i].expense;
}
cout << "Total: " << total << endl;
}
int p7_9getinfo(student pa[], int n)
{
int i;
cout << "Enter a set of students' information, no more than " << n << "\nand a blank line name to quit: \n";
for(i = 0; i< n; i++)
{
cout << "Student " << i+1 << " name: ";
cin.get(pa[i].fullname, 30).get();
if(!cin)
{
cin.clear();
cout << "blank line, input terminated!!\n";
break;
}
cout << "His hobby: ";
cin.getline(pa[i].hobby, 30);
cout << "His opplevel: ";
cin >> pa[i].opplevel;
cin.get();
}
return i;
}
void p7_9display1(student st)
{
cout << "Name: " << st.fullname << endl;
cout << "Hobby: " << st.hobby << endl;
cout << "OPPlevel: " << st.opplevel << endl;
}
void p7_9display2(const student *st)
{
cout << "Name: " << st->fullname << endl;
cout << "Hobby: " << st->hobby << endl;
cout << "OPPlevel: " << st->opplevel << endl;
}
void p7_9display3(const student st[], int n)
{
cout << "STUDENT INFORMATION" << endl;
for (int i = 0; i<n; i++)
{
cout << "Name: " << st[i].fullname << endl;
cout << "Hobby: " << st[i].hobby << endl;
cout << "OPPlevel: " << st[i].opplevel << endl << endl;
}
}
double p7_10caculate(double a, double b, double (*p)(double, double))
{
return p(a, b);
}
double p7_10add1(double a,double b)
{
return a *10 + b*10;
}
double p7_10add2(double a,double b)
{
return a * b;
}
double p7_10add3(double a,double b)
{
return a * 2 * b;
}