Question: Which one of the following is not a feature of third generation languages?

Answer:

Third generation programming languages (3GLs) are high-level programming languages that were developed in the 1960s and are still widely used today. Here are some of their main features:

1. Structured programming: 3GLs are designed for structured programming, which means they use structured control flow constructs like loops and conditional statements to make code easier to read, understand, and maintain.
2. Portability: 3GLs are designed to be portable across different computer platforms, which means they can be compiled or interpreted on different operating systems and hardware architectures.
3. Abstraction: 3GLs provide a high level of abstraction, which means they allow programmers to work at a higher level of conceptualization, without having to worry about the underlying hardware or machine architecture.
4. Data types: 3GLs provide a wide variety of data types, including integers, floating-point numbers, characters, strings, arrays, and structures. This makes it easier for programmers to work with different kinds of data.
5. Libraries: 3GLs often come with extensive libraries of pre-written code that can be used to perform common programming tasks, such as file I/O, sorting, and mathematical calculations.
6. Debugging: 3GLs provide debugging tools that allow programmers to trace program execution, set breakpoints, and step through code line by line, making it easier to find and fix errors.

Overall, the features of 3GLs make them powerful tools for software development, enabling programmers to write complex applications with relative ease and efficiency.