What is an expression tree?

An expression tree is a binary tree used to represent expressions in a structured format, where each internal node corresponds to an operator (such as +, -, *, /) and each leaf node represents an operand (like variables or constants). The tree structure allows for the hierarchical organization of operations, making it easier to evaluate or simplify expressions systematically. By traversing the tree, one can perform operations in the correct order according to operator precedence. Expression trees are commonly used in compilers and calculators to parse and evaluate mathematical expressions.