Description: Expression evaluation is the process of calculating the value of an expression. In the context of programming languages like C++, this involves analyzing and executing mathematical, logical, or other types of operations found in a given expression. Expressions can include variables, constants, operators, and functions, and their evaluation results in a value that can be used in other parts of the program. This process is fundamental in programming, as it allows developers to manipulate data and perform calculations efficiently. Expression evaluation in programming is carried out following operator precedence rules, which determine the order in which different components of the expression are evaluated. Additionally, programming languages provide a variety of data types and operators that allow for complex evaluations, from simple additions to more advanced operations like string manipulation or data structure handling. Proper expression evaluation is crucial for the correct functioning of any program, as it directly influences the logic and control flow of the program.