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program functions_01
implicit none
integer :: x = 5, y
real :: p = 5, q
real :: a, b, c
y = f(x)
print *, y
q = f_real(p)
print *, q
a = 20.0
b = -30.0
c = signr32(a, b)
print *, c
contains
integer function f(a) result(b)
integer, intent(in) :: a
integer :: x
x = 2
b = a + x
end function
real function f_real(a) result(b)
real, intent(in) :: a
b = a + signr32(1.0, a)
end function
real(4) function signr32(x, y) result(r)
real(4), intent(in) :: x, y
r = x
if ((x >= 0.0 .and. y >= 0.0) .or. (x <= 0.0 .and. y <= 0.0)) then
r = x
else
r = -x
end if
end function
end program
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