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;
    
    }
  long Factorial(int no){
     long fac = 1;
     for (int r=no; r >= 1; r--) {
     fac = fac * r;
       }
    return fac;
  }
  long nCr(int n, int r){
    long nCr =Factorial(n)/(Factorial(r)* Factorial(n-r));
    return nCr;
  }
  
  