/* 
 * 
 * CSI2131
 * 
 * Shantanu Das
 * 
 * Lab-9
 * 
 */

#include <iostream>
#include <string>
#include <fstream>
using namespace std;


// Two given Arrays of integers 
int Array1[] = {110,120,130,140,150,160,170,180,190,200};
int Array2[] = { 98, 87, 76, 65, 54, 43, 32, 21, 10, 9 };


int addint(int a, int b) {	return a + b;	}
int subint(int a, int b) {	return a - b;	}
int mulint(int a, int b) {	return a * b;	}
int divint(int a, int b) {	return a / b;	}

/// Array of pointers to functions
int (*FpArr[])(int,int) = { &addint,&subint,&mulint,&divint };

// performs the given operation on elements of the arrays
int* performOp(int *A, int *B, int size, int (*f)(int,int));

// displays the elements of an array
void display(int *X, int size);

// main method
int main( )
{
  
  int choice = 0;                      // user choice
  unsigned int size = 0;			// size of the array
  int *res = NULL;					// to store the result

  size = sizeof(Array1);			// set size to minimum size of the two arrays
  if (sizeof(Array2) < size)
	size = sizeof(Array2);

  size = size / sizeof(int);

  while(choice != 5)
  {
		cout << "\n\nWhich operation do you want to perform? "<< endl;
		cout << "1.Add " << endl;
		cout << "2.Subtract " << endl;
		cout << "3.Multiply " << endl;
		cout << "4.Divide " << endl;
		cout << "5.None ... just quit the program! " << endl;
		cout << "\nEnter choice: " ;
		cin >> choice;

		if(choice == 5) break;
		if(choice < 1 || choice > 5) continue;

		int j = choice - 1;
		res = performOp(Array1,Array2,size,FpArr[j]);		//perform the desired operation.

		cout << "\n\nThe Results are ..." << endl;
		display(res,size);
		
		if(res!=NULL)  
			delete[] res;

  }
  
  cout << endl << "Program completed successfully !!" << endl;


  return 0;
}



// performs the given operation on all elements of the arrays A and B 
int* performOp(int *A, int *B, int size, int (*f)(int,int))
{
	 int *C = new int[size];
     for(int i=0; i < size; i++ )
	 {
		 C[i] = (*f)(A[i],B[i]);
	 }
	 return C;
}

void display(int *X, int size)
{
	 if(X == NULL)  return;

	 for(int i=0; i < size; i++ )
	 {
		 cout << X[i] << "  ";
	 }
	 cout << endl;
}