Make Lesson 1 Task 4 more foolproof
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@ -17,6 +17,10 @@ except ValueError:
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print("Invalid numbers entered.")
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sys.exit(1)
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if not math.isfinite(a) or not math.isfinite(b) or not math.isfinite(c):
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print("Invalid numbers entered.")
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sys.exit(1)
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if a == 0:
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print("Not a quadratic equation.")
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sys.exit(2)
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