4. Exercise

• Modify the previous program so that it can input a value and run for n times instead of the value 10. Assign that value to a variable named n.

• You must call your variable n for your program to pass the test, otherwise it will fail.

# File caos.py # A program that illustrates the Chaos Theory print("This program illustrates chaotic behavior.") x = eval(input("Enter a number between 0 and 1:")) # Modified code n = eval(input("Enter the number of times to run the program:")) for i in range(n): x = 3.9 * x * (1 - x) print("%2.3f" % x) ==== import unittest class myTests(unittest.TestCase): def testOne(self): # Modified code self.assertEqual(n, i+1, "The number of cycles is not specified by the user") myTests().testOne() print("-------------------------------------") print("You have passed 100% of the tests.")

4.1. Summary

• The description of a sequence of steps to solve a problem is called a computational algorithm.

• Algorithms are programs (software) that determine what the computer (hardware) will do.

• The process of creating software is called programming.

4.2. Remember

• Programming languages have a formal syntax.

• Computers only understand machine language.

• Python is a high-level interpreted language.

• The Python interpreter converts instructions command by command into machine language.

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