functions in C++.pdf
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The document discusses an upcoming lecture on functions in programming fundamentals. The lecture will cover standard predefined functions, user-defined functions, and value-returning functions. It will teach how to construct and use value-returning user-defined functions in a program. Modular programming breaks programs into smaller, reusable functions or modules to improve maintainability and simplify the process of writing programs. Functions allow complex programs to be divided into manageable pieces that can be worked on and reused independently.
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- 1. Programming Fundamentals By Adnan Waheed University of Narowal Functions Lecture No. 20 Wednesday, November 22, 2023
- 2. In this week/classes, you will: Learn about standard (predefined) functions and discover how to use them in a program Learn about user-defined functions Examine value-returning functions, including actual and formal parameters Explore how to construct and use a value- returning, user-defined function in a program Objectives
- 3. Modular Programming Modular programming: breaking a program up into smaller, manageable functions or modules Function: a collection of statements to perform a task Motivation for modular programming Improves maintainability of programs Simplifies the process of writing programs
- 4. Introduction Boss to worker analogy A boss (the calling function or caller) asks a worker (the called function) to perform a task and return (i.e., report back) the results when the task is done.
- 5. Introduction Functions are like building blocks They allow complicated programs to be divided into manageable pieces Some advantages of functions: A programmer can focus on just that part of the program and construct it, debug it, and perfect it Different people can work on different functions simultaneously Can be re-used (even in different programs) Enhance program readability
- 6. Introduction (cont'd.) Functions Called modules Like miniature programs Can be put together to form a larger program