Hi all,

The problem is coming for different version of gcc compiler .
the f90 program
Tringal.f90 is working without any error in gcc version
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
but for version
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
the error is as

gfortran -c Traingle.f90
Traingle.f90:16.26:

REAL :: a, b, c, Area
1
Error: Symbol 'area' at (1) already has basic type of REAL
Traingle.f90:19.14:

READ *, a, b, c
1
Error: Symbol 'a' at (1) has no IMPLICIT type
Traingle.f90:19.17:

READ *, a, b, c
1
Error: Symbol 'b' at (1) has no IMPLICIT type
Traingle.f90:19.20:

READ *, a, b, c
1
Error: Symbol 'c' at (1) has no IMPLICIT type



The Triangle.f90 program is

MODULE Triangle_Operations
IMPLICIT NONE
CONTAINS
FUNCTION Area(x,y,z)
REAL :: Area ! function type
REAL, INTENT( IN ) :: x, y, z
REAL :: theta, height
theta = ACOS((x**2+y**2-z**2)/(2.0*x*y))
height = x*SIN(theta); Area = 0.5*y*height
END FUNCTION Area
END MODULE Triangle_Operations

PROGRAM Triangle
USE Triangle_Operations
IMPLICIT NONE
REAL :: a, b, c, Area
PRINT *, 'Welcome, please enter the&
&lengths of the 3 sides.'
READ *, a, b, c
PRINT *, 'Triangle''s area: ', Area(a,b,c)
END PROGRAM Triangle

Hi all,

The problem is coming for different version of gcc compiler .
the f90 program
Tringal.f90 is working without any error in gcc version
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
but for version
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
the error is as

gfortran -c Traingle.f90


The Triangle.f90 program is

You should not use the same string both for function and variable (Area).