template_example.cpp

/*
Create a class template Vector with a type parameter T which holds an array of type T. Also, include constructor to initialize the objects, a function to calculate scalar product of two two vectors by overloading '*' operator so that statements like v1 * v2 are permissible.
Write a main function to test the above class template and find the scalar product of following pairs of vectors. {1, 2, 3}, {4, 5, 6} and               {2.5, 3.5, 4.5}, {1.5, 2.5, 3.5}.
*/

#import <iostream>

using namespace std;

template <typename T>
class Vector{
private:
  T arr[3];
public:
  Vector(T arr[3]){
    for(int i=0; i<3; i++){
      this->arr[i] = arr[i];
    }
  }

  T operator * (Vector<T> const &vec){
    T sum = 0;
    for(int i=0; i<3; i++){
      sum += this->arr[i]*vec.arr[i];
    }
    return sum;
  }

  void display(){
    cout << arr[0] << ' ' << arr[1] << ' ' << arr[2];
  }
};

int main(){
  int a1[] = {1, 2, 3};
  Vector<int> v1 = Vector<int>(a1);

  int a2[] = {4, 5, 6};
  Vector<int> v2 = Vector<int>(a2);

  double a3[] = {2.5, 3.5, 4.5};
  Vector<double> v3 = Vector<double>(a3);

  double a4[] = {4.5, 5.5, 6.5};
  Vector<double> v4 = Vector<double>(a4);

  int res1 = v1 * v2;
  double res2 = v3 * v4;

  cout << "Result 1: " << res1 << endl;
  cout << "Result 2: " << res2;

  return 0;
}