Question

Which of the following languages ​​is an example of a fourth generation language in computer programming?

A. C, C++

B. Java, Visual Basic

C. SQL

D. Perl, Python, Ruby, MatLab

Answer 1

Answer: C. SQL

Answer analysis: In computer programming, the fourth-generation language (4GL) is mainly designed to solve problems in specific fields. They have a higher level of abstraction, allowing non-professional programmers to complete complex tasks through simple instructions or statements. The following is an analysis of the given options:

A, C, C++

* C and C++ are both high-level programming languages, but they do not belong to the category of fourth-generation languages. C language is mainly used as a tool for system software and application software development, with high efficiency and cross-platform characteristics. C++ is a superset of C language, introducing object-oriented features. Both are more inclined to system-level programming and software development rather than rapid application development in specific fields.

B, Java, Visual Basic

* Java is a widely used programming language with cross-platform and object-oriented features, but it is also not a typical fourth-generation language. Although Visual Basic is easy to learn and often used for rapid application development, it is not the most typical example under the definition of fourth-generation languages.

C, SQL

* SQL (Structured Query Language) is a programming language used to manage and operate relational databases. It allows users to define what to do in a non-procedural way without describing in detail how to do it. The SQL language has a concise and clear syntax and powerful data processing capabilities, making it very suitable for tasks such as large-scale data management and data analysis. Therefore, SQL is a recognized example of a fourth-generation language.

D, Perl, Python, Ruby, MatLab

* Perl, Python, and Ruby are all high-level programming languages ​​that are widely used in their respective fields. Perl is known for its text processing capabilities, Python is widely used in fields such as data science and automated scripts, and Ruby is often used in Web development. MatLab is mainly used in scientific computing, algorithm development, and other fields. Although these languages ​​are very powerful, they do not fully meet the definition of a fourth-generation language with rapid application development in a specific field as its core.

In summary, SQL is an example of a fourth-generation language in computer programming. With its non-procedural characteristics and high level of abstraction, it enables users to more easily perform tasks such as database management and data analysis.

Answer 2

In computer programming, a prominent example of the fourth-generation programming language (4GL) is the structured query language (SQL).

SQL is mainly used to manage and operate relational database systems, such as querying, updating, inserting and deleting data. It is a non-procedural programming language, and users only need to tell the system "what to do" without detailing "how to do it", thereby improving development efficiency and software productivity.

In addition, SQL also has powerful data processing capabilities and can easily handle large amounts of data, making it an indispensable tool in database management systems.

In addition to SQL, there are some other 4GL examples, such as report generators, application generators, etc., which all simplify the programming process in different ways and improve software development efficiency.

Answer 3

C++ and Java are two popular programming languages ​​that differ significantly in many aspects.

1. Programming paradigm: C++ supports both procedural and object-oriented programming, while Java is a fully object-oriented programming language.

2. Memory management: C++ requires programmers to manually manage memory, including allocation and release, which increases the complexity of programming and the possibility of errors. Java, on the other hand, automatically manages memory through a garbage collection mechanism, reducing the burden on programmers.

3. Platform compatibility: Java is designed as a cross-platform language and can run on any operating system with a Java Virtual Machine (JVM) installed. C++ is more dependent on a specific operating system and compiler, and has poor portability.

4. Execution speed: Since C++ is a compiled language, it is usually faster than the interpreted language Java. However, with the continuous development of Java virtual machine technology, Java's execution speed is also constantly improving.

5. Application areas: C++ is often used in system-level programming, game development and other fields due to its high performance and underlying control capabilities. Java, on the other hand, is widely used in Web development, enterprise-level applications, mobile applications and other fields due to its cross-platform nature and rich library support.

To sum up, C++ and Java each have their own advantages and applicable scenarios. The choice of language depends on the specific application requirements and development environment.

Answer 4

C and C++ are two widely used programming languages ​​that have similarities and significant differences in many aspects. Here are brief answers to both:

C

Definition: C is a general-purpose, procedural programming language developed by Dennis Ritchie in 1972. It is known for its efficiency, flexibility, and portability.

Features: C supports structured programming, contains a rich set of operators and data types, can directly access hardware, and is suitable for system programming, embedded development, etc.

Application: Widely used in operating systems, compilers, databases, game development and other fields.

C++

Definition: C++ is an object-oriented programming language developed by Bjarne Stroustrup in 1983 as an extension of C. It retains all the features of C and adds support for object-oriented programming.

Features: C++ supports object-oriented programming features such as encapsulation, inheritance, and polymorphism, and also introduces modern programming features such as templates and exception handling.

Application: C++ is widely used in software development, game development, graphical interface development, embedded systems and other fields, especially in situations where high performance and direct hardware access are required.

In summary, both C and C++ are powerful programming languages, but C++ provides a richer programming paradigm and a higher level of abstraction by introducing object-oriented programming features, making the development of large and complex software systems easier and more efficient.

Answer 5

Perl is a high-level, interpreted, dynamic programming language released by Larry Wall in 1987. It is known for its powerful text processing capabilities, especially in handling report generation, file conversion, system management tasks, etc.

Perl absorbs the features of languages ​​such as C, Shell scripting language, AWK, sed, and adds a lot of innovations, such as flexible syntax, regular expression support and a huge CPAN library, providing developers with rich resources and tools.

Perl is widely used in many fields such as system management, network programming, Web development, etc.