Question

Write a function called middle(string str) that returns a string containing the middle character in str if the length of str is odd, or the two middle characters if the length is even. Write the main that tests this function.

Answer 1

The function middle() in Python is designed to return the middle character(s) of a given string. It calculates the center index or indices based on the length's parity and returns the appropriate substring. A sample main function is provided to test various strings with this function.

Step-by-step explanation:

The student has requested a function called middle() which takes a string str and returns the middle characters. Depending on whether str has an odd or even number of characters, the function will return one or two central characters, respectively. Here is a possible way to implement the middle() function in Python:

def middle(str):
length = len(str)
if length % 2 == 1:
return str[length // 2]
else:
middle1 = length // 2 - 1
middle2 = length // 2
return str[middle1] + str[middle2]

And here's an example of a main function to test it:

def main():
test_strings = ['abc', 'abcd', 'abcde', 'abcdef']
for s in test_strings:
print(f'Middle characters of \'{s}\': {middle(s)}')

if __name__ == '__main__':
main()

Answer 2

Note: a) If the length of the string is odd there will be two middle characters.

Step-by-step explanation:

b) If the length of the string is even there will be one middle character. There was a problem connecting to the server. Please check your connection and try running the trinket again.