(adsbygoogle = window.adsbygoogle || []).push({}); Getting an "unclassifiable statement" error in Fortran 95

I am trying to integrate the function x from 0 to 1. Here is my code:

program myownmonte

!This program will integrate the function x from 0 to 1

implicit none

real :: ans0,y,f,x,xmax

integer :: icount,nmax,i,iseed

iseed = 89237

call srand(iseed)

nmax = 100000

icount = 0

xmax = 1

ans0 = 0

do i=1,nmax

x = rand()

y = rand()

f = f(x)

if (y.le.f) then

icount = icount + 1

end if

ans0 = ans0 + f(x)

end do

print *, icount/nmax,ans0/nmax

end program myownmonte

function f(x)

implicit none

real :: x,f

f = x

end function f

And here are the errors I'm getting:

f = f(x)

1

Error: Unclassifiable statement at (1)

mymonte.f95:21:

ans0 = ans0 + f(x)

1

Error: Unclassifiable statement at (1)

Could someone help me fix this, and kindly let me know what the phrase "unclassifiable statement" means? Thanks in advance!

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# Getting an unclassifiable statement error in Fortran 95

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