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 Factorial(int no)
  {   
     int i;
     long ans=1;
    for(i=1;i<=no;i++)
     {
       ans=i*ans;
     }
   return ans;
  	
  }
   
  long nCr(int n, int r)
  {
    long q= Factorial(n)/(Factorial(r)*Factorial(n-r));
    return q;
    
   }
  