Question

Write a recursive function, len, that accepts a parameter that holds a string value, and returns the number of characters in the string. The length of the string is: 0 if the string is empy ("") 1 more than the length of the string beyond the first character

Answer 1

following are the method definition to this question:

def len(x): #defining a method

if(x==""): #defining condition that checks value store nothing

return 0# return value

else: # else block

return 1+len(x[1:]) #use recursive function and return value

print(len('The collection of table')) #call method and prints its value

Output:

23

Explanation:

In the above method definition, a "len" method is declared, in which x variable accepts as its parameter, inside the method a condition block is used, which can be explained as follows:

• In if block, we check the value is equal to null if this condition is true, it will return a value, that is 0.
• In this condition is false, it will go to else block in this block, the recursive method is used, which calculates value length and return its value.