[Solved] Why does ‘static int’ give a different answer while recursively calculating the length of the linked list?

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When len is static, it’s not every call to length increment the same variable.

Here’s what happens

1->
   2->
      3->
         4->
            5
            add 1 to length (length = 1)
         add 2 to length (length = 3)
      add 3 to length (length = 6)
   add 4 to length (length = 10)
add 5 to length (length = 15)

return length + 1 (15 + 1)

16

When you use a local length (int length), at each recursive call, length is set to 0 in this instance of the function.

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solved Why does ‘static int’ give a different answer while recursively calculating the length of the linked list?