PROBLEM AND A SOLUTION

C++ PROBLEM WITH SOLUTION:

SOLUTION:

1  #include <iostream>

2  using namespace std;

3

4  double  average_x;

5  double  mean_y;

6  double m;

7  double b ;

8  int main()

9  {

10  int p;

11  double x, y,  sum_x, sum_y, sum_xx, sum_xy;

12  sum_x=0;

13  sum_y=0;

14  sum_xx=0;

15  sum_xy=0;

16

17

18  cout<< "Enter the number of paired values: ";

19

20  cin  >>p;

21

22  cout  <<p << " pairs are required:\n ";

23

24  for (int a = 1; a <= p; a++)

25  {

26    cout << "First pair " <<a<<" ? ";

27

28  cin  >> x  >>y;

29

30

31  sum_x = sum_x + x;

32  sum_y = sum_y + y;

33  sum_xx = sum_xx + x*x;

34  sum_xy=sum_xy + x*y;

35

36  }

37

38  average_x = sum_x/p;

39  mean_y = sum_y/p;

40  m = (sum_xy  - mean_y*sum_x)/(sum_xx -average_x*sum_x);

41  b =  mean_y  -  average_x*m;

42

43  cout  << "The least squares regression line is:\n";

44

45  cout<<"Y = "<< m <<" X + "<<"("<< b<<")" <<endl;

46  }