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Annotation of 42BSD/usr.lib/learn/eqn/L5.1e, revision 1.1.1.1

1.1       root        1: #print
                      2: Once you start using braces, there are a number of
                      3: mistakes that you can make.  For example, you can
                      4: leave a brace out, or you can get them out of order
                      5: (Like } xxx { ), or you can get them in illegal places.
                      6: For all of these, neqn tells you "syntax error",
                      7: then tries to say what file and line numbers are
                      8: involved.
                      9: The line numbers are often not exact, but
                     10: they are very close.  When you get such a message,
                     11: print a line or two before and after the line
                     12: numbers named in the syntax error message.
                     13: 
                     14: The file "Example" contains a syntax error.
                     15: What line does neqn believe it begins on?
                     16: Type "answer N", where N is the line number.
                     17: #once #create Example
                     18: .LP
                     19: .EQ 3
                     20: e sup -x sup 2 + e sup -x sub i sup 2 + e sup{-x sub i}sup 2
                     21: .EN
                     22: .EQ 4
                     23:    e sup{-{x sub i sup 2 + y sub i sup 2}over 2}
                     24: = e sup{- x over y}
                     25: .EN
                     26: .EQ 5
                     27: a over b = c over d = A over B times C over D
                     28: .EN
                     29: .EQ 8
                     30: B sub a sub 2 +
                     31: B sub a sup 2 +B{ sub a}sup 2 + (B sub a ) sup 2 + (B sup 2 ) sub a
                     32: +B sup 2 sup x
                     33: .EN
                     34: #copyin
                     35: #user
                     36: #uncopyin
                     37: #match 13
                     38: #log
                     39: #next
                     40: 5.1f 10

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