👉 In mathematics, "undeclared" refers to a situation where a variable or symbol is not explicitly declared and it remains unassigned. In computer programming, this could mean that a variable has been assigned an undefined value, such as 0, which means that there is no value assigned to the variable. For example, consider the following Python code: ```python x = 5 print(x) ``` In this case, the expression `x` is not declared and it will result in