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#include <iostream>
#include <math.h>
#include <cmath>
#include <cstdlib>
using namespace std;
long double fact(int N) // N
{
if (N < 0)
return 0;
if (N == 0)
return 1;
else
return N * fact(N - 1);
}
long double proizv(int n) { // n*(n+1)*...*(n^2)
long double sum, sum1, sumpart;
int k;
k = pow(n, 2); //
sum = fact(k);
sumpart = fact(n - 1);
if (sum == 1)
sum1 = 1;
else
sum1 = sum / sumpart;
return sum1;
}
int main() {
setlocale(LC_ALL, "Russian");
int n, k, i, answer;
long double sum1, sumall = 0;
cout << " n: ";
cin >> n;
if (n<1 || cin.fail())
cout << ". ." << endl;
cin.clear();
cin.ignore(cin.rdbuf()->in_avail());
while (n<1) {
cout << " : ";
cin >> n;
if (n<1 || cin.fail()) cout << ". ." << endl;
cin.clear();
cin.ignore(cin.rdbuf()->in_avail());
}
cout << " =" << proizv(n) << endl;
for (int i = 1; i <= n; i++) //
{
sumall += proizv(i); //
}
cout << ": " << sumall << endl;
cout << endl;
cout << " ? 1 0 ." << endl;
cin >> answer;
if (answer<0 || answer>1 || cin.fail())
cout << ". 1 0 ." << endl;
cin.clear();
cin.ignore(cin.rdbuf()->in_avail());
while (answer<0 || answer>1) {
cout << " : ";
cin >> answer;
if (answer < 0 || answer > 1 || cin.fail()) cout << ". 1 0 ." << endl;
cin.clear();
cin.ignore(cin.rdbuf()->in_avail());
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}
switch (answer) {
case 1:
for (int i = 1; i <= n; i++) //
{
cout << i << " =" << proizv(i)<<endl; //
}
break;
case 0:
exit(0);
break;
}
system("Pause");
return 0;
}
1 , . 
. 2. 1
++. (fact, proizv) (int(main){}).
1. .. /++. - -. , 2006.
2. -: http://cppstudio.com/post/348/
3. -: http://cppstudio.com/post/396/
4. () 19.701-90
5. .. , , , 2016/2017.
