Final Value of Variable after Performing Operations Lab

Easy
6
42.5% Acceptance

In this lab, you will be working with a programming language that has only four operations and one single variable X. Your task is to determine the final value of the variable X after performing a list of operations. The operations and their effects are as follows:

  • ++X and X++ will increment the value of the variable X by 1.
  • --X and X-- will decrement the value of the variable X by 1.

Initially, the value of X is 0. You will be given an array of strings operations containing a list of operations that you need to perform. Your goal is to return the final value of X after performing all the operations.

Examples

Let's take a quick look at some examples to better understand the problem.

Example 1:

Input: operations = ["--X","X++","X++"]

Output: 1

Explanation: The operations are performed as follows:

  • Initially, X = 0.
  • --X: X is decremented by 1, X = 0 - 1 = -1.
  • X++: X is incremented by 1, X = -1 + 1 = 0.
  • X++: X is incremented by 1, X = 0 + 1 = 1.

Example 2:

Input: operations = ["++X","++X","X++"]

Output: 3

Explanation: The operations are performed as follows:

  • Initially, X = 0.
  • ++X: X is incremented by 1, X = 0 + 1 = 1.
  • ++X: X is incremented by 1, X = 1 + 1 = 2.
  • X++: X is incremented by 1, X = 2 + 1 = 3.

Example 3:

Input: operations = ["X++","++X","--X","X--"]

Output: 0

Explanation: The operations are performed as follows:

  • Initially, X = 0.
  • X++: X is incremented by 1, X = 0 + 1 = 1.
  • ++X: X is incremented by 1, X = 1 + 1 = 2.
  • --X: X is decremented by 1, X = 2 - 1 = 1.
  • X--: X is decremented by 1, X = 1 - 1 = 0.

Constraints

  • 1 <= operations.length <= 100
  • operations[i] will be either "++X", "X++", "--X", or "X--".

Remember to export all the functions and variables you need to test in the evaluation script. Good luck!