Hello all, I'm kinda stuck with this fortran 95 program I have to write. It is an Infinite Series of SIN. IMPLICIT NONE ! ! Data Dictionary REAL :: x ! Measurement of angle in degrees REAL :: result ! facilitates addition of the functions REAL :: f_x ! function defining the series REAL :: rad_x ! Radians equivalent of x REAL :: int_value ! Intrinsic function value of sin REAL, PARAMETER :: PI = 3.141593 ! universal ratio of circle's diameter INTEGER :: n ! Counter INTEGER :: fac ! factorial calculation ! User Input of X WRITE (*,*) 'Input degrees' READ (*,*) x ! ! Convert to Radians rad_x = x *(PI/180) ! ! Defining Base values for addition of LOOPs result = 0.0 fac = 0 ! ! Start of DO LOOP DO n = 1, 10 fac = (2n - 1) *n f_x = (-1.0**(n-1))*((rad_x**(2n-1))/(fac)) result = f_x + result END DO ! ! Calcualte INtrinsic value of SIN int_value = SIN(rad_x) ! ! Display information WRITE (*,*) 'Intrinsic SIN function value', int_value WRITE (*,*) 'Calculated value of SIN', result ! ! Finish Up END PROGRAM infinite_series And I receive the following errors from the compiler In file infinite.f95:35 fac = (2n - 1) *n 1 Error: Expected a right parenthesis in expression at (1) In file infinite.f95:36 f_x = (-1.0**(n-1))*((rad_x**(2n-1))/(fac)) 1 Error: Expected a right parenthesis in expression at (1) The "1" is actually under the 2 in (2n-1) but it wont stay put in the post. I'm trying to compile to see if the program even works but I need to get past this first. Thank you for any help After about a couple hours of racking my brain I discovered I was missing the multiply operator between the 2 and n. fail Now the program compiles but I'm having issues with getting the factorial part of the work properly. I can't seem to figure out how to get it to multiply properly within the DO loop. If I separate the two, I can get the factorial to work, but I will not get the equation to work. argh!