C.2.6. - Error handling
Syntax errors from bad grammar are noted with the offending character
indicated.
On the following error conditions -- dividing by zero,
taking the square root of a negative number, taking the logarithm
of 0 or a negative number, raising 0 to a non-positive exponent and
raising a negative number to a non-integral exponent -- an error
message is printed showing the index number of the current point.
The offending operation is not performed and calculations continue.
Other error messages may be produced by the math library routines
if they have problems with your numbers.
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