Write a Python program that allows user to repeatedly enter a series of float numbers, until the string end is entered. For each number entered, calculate and print its double (multiply by 2). Note that . (1) Sentinel must be used. • (2) The placement of data type conversion is critical. [Run your program in Python IDLE to verify if it works correctly as described above] Enter a float number or 'end' to stop: 2.4 The double of 2.4 is 4.8 Enter a number or 'end" to stop: 4.123 The double of 4.123 is 8.246 Enter a number or 'end' to stop: end

Write a C++ program that will print out the following simple shapes: triangle, rectangle and diamond using different characters for each shape. Requirements:- each shape uses a different character and it must be exactly 5 lines.- for this exercise, please do not use loop but only simple printing characters.

[Python Language]   A common back-of-the-envelope technique for estimating a runner’s marathon time is to take their best half-marathon time, multiply by two and add ten minutes. This works pretty well unless the marathon course is hilly.If it is hilly, we add an extra 20 minutes to the estimate. Write a program that takes two lines of input: a float giving the half- marathon time in minutes and an integer indicating whether the marathon course is hilly(1) or not (0). It prints a float giving the estimated number of minutes the runner will take to run the full marathon. Write your pro- gram in a file named marathon.py.