Subprograms
Akopọ
A long program that repeats the same block of code in five different places is fragile: fix a bug in one copy and the other four still carry it. Subprograms solve this by giving a named, reusable block of code a single home, one that any part of the program can call on whenever it is needed.
In this lesson you will learn the difference between procedures and functions, how to pass data into a subprogram using parameters and get data back out using a return value, and how local and global scope decide which parts of a program can see which variables. Every example is written in Python, one of the languages you can use for the Paper 2 practical programming exam.
Awọn Afojusun
- Understand the benefits of using subprograms and be able to write code that uses user-written and pre-existing (built-in, library) subprograms
- Understand the concept of passing data into and out of subprograms (procedures, functions)
- Be able to create subprograms that use parameters
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Oriire fun ipari ẹkọ lori Subprograms. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which keyword does a Python subprogram use to send a value back to the code that called it? A) global B) def C) return D) import Answer: C
- In def add(a, b): return a + b, what are a and b called? A) Arguments B) Parameters C) Return values D) Global variables Answer: B
- Which of these best describes a procedure? A) A subprogram that always returns a numeric value B) A subprogram that carries out a task but does not return a value C) A subprogram that can only be called once D) A built-in Python keyword Answer: B
- A variable is created inside a function using an assignment statement and is never declared global. What is its scope? A) It is global and can be read anywhere B) It is local to that function only C) It exists for the whole program but only after the function is called D) It has no scope in Python Answer: B
- Which statement must appear inside a subprogram before it can change the value of a variable defined outside every subprogram? A) local B) return C) global D) import Answer: C
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