text: /*Exercise 4 - Functions
  
  Write a program to calculate the function called nCr which is defined as
  
  nCr = n!/ r!(n−r)!
  Where n! is the factorial of n.
  
  Implement the functions
  
  long Factorial(int no);
  long nCr(int n, int r);
  Do not modify the main function.*/
  
  #include <iostream>
  
  long Factorial(int no);
  long nCr(int n, int r);
  
  int main() {
    int n, r;
    std::cout << "Enter a value for n ";
    std::cin >> n;
    std::cout << "Enter a value for r ";
    std::cin >> r;
  	
  std::cout << "nCr = ";
   std::cout << nCr(n,r);
   std::cout << std::endl;
  	return 0;
  }
  
  long nCr(int n, int r)//to find factorial of value r
  {
  	
  	return Factorial(n)/(Factorial(r)*Factorial(n-r));
  }
  
  long Factorial(int no)//to find factorial of value n
  {
  	long fac_n=1;
  	for(int i=1;i<=no;i++)
  	{
  		fac_n=fac_n*i;
  	}
  
  	return fac_n;
  }
  