Which of the following is a function of syntax in programming languages?

The function of syntax in programming languages is fundamentally about defining the structure of statements. Syntax dictates how code is written, including the rules and conventions that determine what constitutes a valid statement in that language. It specifies how keywords, operators, and identifiers can be combined to form meaningful instructions for the computer.

This structure is crucial because it ensures that the compiler or interpreter can parse and understand the code as intended. If the syntax is incorrect, the code will result in errors and won't be executed. For instance, programming languages have specific requirements for how to declare variables, write functions, and use control structures like loops and conditionals. These rules can vary significantly from one programming language to another.

While other aspects, such as code efficiency, user interaction, and readability, are important considerations in programming, they do not fall under the purview of syntax. Code efficiency relates to how well the code performs and utilizes resources, user interaction pertains to how the software engages with users, and readability focuses on how easily another programmer can understand the code. All of these can be influenced by the choice of syntax but are not direct functions of what syntax itself does.