Fixed incorrect line numbers in 08-defensive.md #1
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The line numbers referred to in the normalize_rectangle function of defensive programming were incorrect. My guess is the comment line was added later, and the line numbers were not updated. I corrected "The preconditions on lines 2, 4, and 5 catch invalid inputs:" to be "The preconditions on lines 3, 5, and 6 catch invalid inputs:" and "...we realize that line 10..." to be "...we realize that line 11..." Also added the line numbers for the post-conditions "The post-conditions on lines 17 and 18...". This clarifies to learners which assertions were preconditions and which ones were post-conditions
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The line numbers referred to in the normalize_rectangle function of defensive programming were incorrect. My guess is the comment line was added later, and the line numbers were not updated. I corrected "The preconditions on lines 2, 4, and 5 catch invalid inputs:" to be "The preconditions on lines 3, 5, and 6 catch invalid inputs:" and "...we realize that line 10..." to be "...we realize that line 11..."
Also added the line numbers for the post-conditions "The post-conditions on lines 17 and 18...". This clarifies to learners which assertions were preconditions and which ones were post-conditions