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!050200102
module hw5
public :: hw5subroutine
contains
subroutine hw5subroutine(x, y, a, b, n)
integer:: j, n
real, dimension(:), intent(in):: x, y
real, intent(out) :: a, b
real:: sum_x, sum_y, sum_xx, sum_xy
sum_x=0
sum_y=0
sum_xx=0
sum_xy=0
do j=1,n
sum_x=sum_x+x(j)
sum_y=sum_y+y(j)
sum_xy=sum_xy+x(j)*y(j)
sum_xx=sum_xx+x(j)**2
end do
a=((sum_x*sum_y)-(n*sum_xy))/((sum_x**2)-(n*sum_xx))
b=(sum_y-(a*sum_x))/n
end subroutine hw5subroutine
end module hw5
program hwork5
use hw5
implicit none
real,dimension(8) :: x, y
integer:: i,n
real:: a, b
n=8
open(unit=3, file="C:UsersulfenDesktopinputhw5.txt", status="old", action="read", position="rewind")
do i=1, 8
read(unit=3,fmt="(F5.2,T6,F5.2)") x(i), y(i)
write(*,fmt="(2x,F5.2,x,F5.2)") x(i), y(i)
end do
call hw5subroutine(x, y, a, b, n)
write(*,*) "a value is ", a, " b value is ", b
close(unit=3, status="keep")
end program hwork5
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