Question

Define a function called repeat_middle which receives as parameter one string (with at least one character), and it should return a new string which will have the middle character/s in the string repeated as many times as the length of the input (original) string.

Notice that if the original string has an odd number of characters there is only one middle character. If, on the other hand, if the original string has an even number of characters then there will be two middle characters, and both have to be repeated (see the example).

Additionally, if there is only one middle character, then the string should be surrounded by 1 exclamation sign in each extreme . If , on the other hand, the original string has two middle characters then the returned string should have two exclamation signs at each extreme.

As an example, the following code fragment:

print (repeat_middle("abMNcd"))

should produce the output:

!!MNMNMNMNMNMN!!

Answer 1

Python Program:

def repeat_middle(st):
   """ Function that repeats middle character """
  
   # String that has to be returned
   newSt = "";
  
   # Finding the length of the string
   stLen = len(st)
  
   # Checking length
   if stLen%2 == 0:
       # Even number of characters
       middlePos = int(stLen/2)
      
       # Adding exclamation
       # Forming string
       newSt = "!!"
      
       # Repeating character's
       for i in range(stLen):
           newSt = newSt + ( st[middlePos-1] + st[middlePos] )
          
       # Adding last string
       newSt = newSt + "!!"
      
   else:
       # Odd number of characters
       middlePos = int(stLen/2)
      
       # Adding exclamation
       # Forming string
       newSt = "!"
      
       # Repeating character's
       for i in range(stLen):
           newSt = newSt + ( st[middlePos] )
          
       # Adding last string
       newSt = newSt + "!"
      
   # Returning string
   return newSt
  

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Sample Run:

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Please let me know if you need the same program in any other Programming Language..