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From: firth@sei.cmu.edu (Robert Firth)
Newsgroups: comp.lang.fortran
Subject: Re: "Interesting" error interpretation by f77.
Message-ID: <2577@aw.sei.cmu.edu>
Date: Tue, 22-Sep-87 09:13:25 EDT
Article-I.D.: aw.2577
Posted: Tue Sep 22 09:13:25 1987
Date-Received: Thu, 24-Sep-87 05:56:48 EDT
References: <5117@jade.BERKELEY.EDU>
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Organization: Carnegie-Mellon University, SEI, Pgh, Pa
Lines: 30
Keywords: FORTRAN parsing, error interpretation.

In article <5117@jade.BERKELEY.EDU> lagache@violet.berkeley.edu (Edouard Lagache) writes:

      PROGRAM PRACT
      REAL NUM1,NUM2,SUM
      WRITE(*,*) 'Enter two numbers to be added to each other:'
      READ(*,*) NUM1, NUM2
    SUM = NUM1 + NUM2
      WRITE(*,*)
      WRITE(*,*) 'The sum of the two numbers is : ',SUM
      STOP
      END

 %f77 practice.f
 practice.f:
    MAIN pract:
 Error on line 4 of practice.f: syntax error
 Warning on line 9 of practice.f: local variable num2 never used
 Warning on line 9 of practice.f: local variable read never used

Could the problem be that the 'U' on line 5 is interpreted as a
continuation symbol?  Hence the compiler thinks line 4 reads

	READ(*,*)NUM1,NUM2M=NUM1+NUM2

This MIGHT cause it to think READ was an array, since the line
now appears to be an assignment statement.

However, does this really matter?  A compiler whose error reporting
is this bad should not be lightly tossed aside - it should be thrown
with great force.