#### Exercise 48

Write a **Python algorithm** as a function which takes **as parameters** a pair of** strings (s1, s2)** and which returns the **string s** obtained by **concatenating** in an **alternative way** the **characters** of **s1** and **s2**.__ Example:__ for **(s1, s2) = ("Python" , "Java")** the function returns the string **s = 'PJyatvha'**

#### Solution

def concatenate_alternate(s1, s2): s = '' for i in range(max(len(s1), len(s2))): if i < len(s1): s += s1[i] if i < len(s2): s += s2[i] return s # Example s1 = "Python" s2 = "Java" s = concatenate_alternate(s1, s2) print(s) # Output: PJyatvha

__In this algorithm__:

**we create an empty string s:**which will hold our concatenated string.**We use the max() function:**to get the length of the longer string so we know how many iterations we need to do.**We loop through each index i:**up to the length of the longer string.**For each iteration:**we check if i is within the bounds of s1 and s2. If it is, we add the character at index i from the respective string to our s string.**Finally:**we return the concatenated s string.

**Younes Derfoufi**

**my-courses.net**

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