void main()
{
clrscr();
int n,r;
cout<<"Enter n and r:\n";
cin>>n>>r;
long p=Fact(n)/(Fact(r)*Fact(n-r));
cout<<p;
getch();
}
unsigned int Fact(const unsigned int n){
static unsigned int f[10] = {1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880};
if(n < 10)
return f[n];
return(Fact(n-1)*n);
}
int Fact(int nombre) {
if (nombre < 2)
return 1;
else
return nombre * Fact(nombre - 1);
}
// Factorial(n) = n * Factorial(n-1). Factorial(0) = Factorial(1) = 1
int Fact(int n)
{
if(n <= 1)
return 1;
return n * Fact(n-1);
}
/*---------------------------------------------------------------------------*/
PPINT CombNoRep(INT n, INT k, PINT pNComb) {
INT NComb, nk;
INT i, j;
PPINT S;
NComb = 0;
nk = n - k;
(*pNComb) = Fact(n) / (Fact(k) * Fact(nk));
S = (PPINT) GetMem2D(*pNComb, k, (SIZE) sizeof(INT), "CombNoRep");
/* fprintf(stderr,"Convinaciones=%d.\n",Fact(n)/(Fact(k)*Fact(nk)) );
fprintf(stderr,"Fact(%d)=%20d, Fact(%d)=%20d, Fact(%d)=%20d.\n",
n,Fact(n),k,Fact(k),nk,Fact(nk));
fprintf(stderr,"n=%d, k=%d.\n", n, k);
fprintf(stderr,"NComb=%d, pNComb=%d.\n",NComb, (*pNComb));
*/
for (i = 0; i < k; i++)
S[NComb][i] = i;
/*PrintVINT(stderr,S[NComb],k);*/
while (S[NComb][0] < nk) {
NComb++;
CopyVINT(S[NComb], S[NComb - 1], k);
if (S[NComb][k - 1] < n - 1)
S[NComb][k - 1]++;
else {
j = 1;
while (S[NComb][k - 1 - j] == n - 1 - j)
j++;
S[NComb][k - 1 - j]++;
for (i = k - j; i < k; i++)
S[NComb][i] = S[NComb][i - 1] + 1;
}
/* fprintf(stderr,"NComb=%d = ",NComb);
PrintVINT(stderr,S[NComb],k);
*/
}
return S;
}
long int Fact(int n)
{
long int x;
if (n > 1)
{
x = Fact(n - 1);
return n * x;
}
else
{
return 1;
}
}
/*
* FUNCTION: CalcWinnings
*
* CATEGORY: Draw Function
*
* PURPOSE: In loto's games get the winners bets per category
*
* PARAMETERS:
* (I) WORD NumResults - Number of results
* (I) WORD WinDegree - How many hits to look for
* (I) WORD CorrectBets - How many are the right bets
* (I) WORD InCorrectBets - How many are the no right bets
*
* RETURN VALUE:
* The number of winners bets
*
* COMMENTS:
*
*/
DWORD CalcWinnings (WORD NumResults,
WORD WinDegree,
WORD CorrectBets,
WORD InCorrectBets)
{
WORD _idx;
DWORD _count;
DWORD _correct_combination;
_count = 1;
for ( _idx = 0; _idx < (NumResults - WinDegree); _idx++ )
{
_count *= (DWORD) (InCorrectBets - _idx);
}
_count /= Fact (NumResults - WinDegree);
// Get how many groups of correct combinations are in the CorrectBets
_correct_combination = Fact (CorrectBets) / (Fact (WinDegree) * Fact (CorrectBets - WinDegree));
_count *= _correct_combination;
return _count;
}
SectionForm::SectionForm(QWidget *parent)
: Form(parent)
{
section = Fact();
QHBoxLayout *layout = new QHBoxLayout(this);
nameInput = new QLineEdit();
layout->addStretch(1);
layout->addWidget(new QLabel("Name: "));
layout->addWidget(nameInput);
layout->addStretch(1);
connect(nameInput, SIGNAL(textChanged(QString)), this, SLOT(checkValidity()));
}
void Calculatrice::fonctionBoutonFact() {
if (base == 2)
binDec();
if (base == 8)
octDec();
if (base == 16)
hexDec();
QString nbtxt = ligne->text();
double nombre = floor(nbtxt.toDouble());
nombre = Fact(nombre);
numbersloved = true;
ligne->setText(QString::number(nombre));
if (base == 2)
decBin();
if (base == 8)
decOct();
if (base == 16)
decHex();
}
unsigned long Splines::C(unsigned long n, unsigned long i)
{
return Fact(n) / (Fact(i) * Fact(n - i));
}
int main()
{
printf("%ld\n", Fact(4));
return 0;
}
