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3. criteria

This document discusses evaluation criteria for programming languages including readability, writability, reliability, and cost. It defines each criteria and provides examples. Readability considers simplicity, orthogonality, data types, and syntax. Writability focuses on abstraction and expressivity. Reliability examines type checking, exception handling, and aliasing. Cost analyzes training, compilation/execution, implementation, maintenance, and poor reliability.

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PL Evaluation Criteria Lesson 3 MANOLO L. GIRON RMTU Structure of Programming Language
CRITERIA • Readability • Writability • Reliability • Cost Structure of Programming Language
Readability • One of the most important criteria for judging a programming language is the ease with which programs can be read and understood. • Overall Simplicity - A language with a large number of basic constructs is more difficult to learn than one with a smaller number. • Orthogonality - means that a relatively small set of primitive constructs can be combined in a relatively small number of ways to build the control and data structures of the language. • Data Types - The presence of adequate facilities for defining data types and data structures in a language is another significant aid to readability. • Syntax Design - The syntax, or form, of the elements of a language has a significant effect on the readability of programs. Structure of Programming Language
Writability • Writability is a measure of how easily a language can be used to create programs for a chosen problem domain. • Support for Abstraction - means the ability to define and then use complicated structures or operations in ways that allow many of the details to be ignored. • (1st category)Process abstraction - is the use of a subprogram to implement a sort algorithm that is required several times in a program. • (2nd category)Data abstraction - a binary tree that stores integer data in its nodes. • Expressivity - it means that there are very powerful operators that allow a great deal of computation to be accomplished with a very small program. Structure of Programming Language
Reliability • A program is said to be reliable if it performs to its specifications under all conditions. • Type Checking - is simply testing for type errors in a given program, either by the compiler or during program execution. • Exception Handling - The ability of a program to intercept run-time errors (as well as other unusual conditions detectable by the program), take corrective measures, and then continue is an obvious aid to reliability. • Aliasing - is having two or more distinct names that can be used to access the same memory cell. Structure of Programming Language
Cost • the cost of training programmers to use the language. • the cost of compiling and executing programs written in a language is greatly influenced by that language’s design. • the cost of the language implementation system. • the cost of poor reliability. • the cost of maintaining programs, which includes both corrections and modifications to add new functionality. Structure of Programming Language
REFERENCES • CONCEPTS OF PROGRAMMING LANGUAGES TENTH EDITION ROBERT W. SEBESTA Structure of Programming Language