{"id":255,"date":"2023-06-13T14:33:35","date_gmt":"2023-06-13T14:33:35","guid":{"rendered":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/?page_id=255"},"modified":"2023-06-13T14:43:27","modified_gmt":"2023-06-13T14:43:27","slug":"functions-procedures","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/functions-procedures\/","title":{"rendered":"Functions & Procedures"},"content":{"rendered":"
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Functions<\/h2>\n
\n\n

Functions<\/h3>\n

In Python, functions are a way to group a set of statements together to perform a specific task. They allow you to organize your code into reusable blocks, making it easier to read, understand, and maintain. All functions must return a value using the return<\/strong> statement, otherwise it isn’t function – it’s a procedure.<\/p>\n

<\/p>\n

\n
# Function definition<\/span>\r\ndef<\/span> greet<\/span>():\r\n    return \"Hello, world!\"<\/span>\r\n\r\n# Calling the function<\/span>\r\nprint(greet())  # Output: Hello, world!<\/span>\r\n<\/pre>\n<\/div>\n
Here the greet function returns the string “Hello, world!” to the program and the print function prints it out to the screen.<\/p>\n\n<\/div>
Input parameters<\/h2>\n
\n\n
Input Parameters<\/h3>\n
Functions can also take input values (arguments or parameters) and optionally return a result. Here’s an example of a function that takes arguments and returns a value:<\/p>\n
Here’s an example of defining and calling a simple function in Python:<\/p>\n
<\/p>\n
\n
# Function definition with arguments and return value<\/span>\r\ndef<\/span> add_numbers<\/span>(x, y):\r\n    return<\/span> x +<\/span> y\r\n\r\n# Calling the function and using the returned value<\/span>\r\nresult =<\/span> add_numbers(5<\/span>, 3<\/span>)\r\nprint<\/span>(result)  # Output: 8<\/span>\r\n<\/pre>\n<\/div>\n
In this example, the function add_numbers<\/code> takes two arguments x<\/code> and y<\/code> and returns their sum. The returned value is stored in the result<\/code> variable and printed.<\/p>\n
Optional parameters & default values<\/strong><\/p>\n
Python functions can have multiple parameters, and you can define default values for some or all of the parameters. Here’s an example:<\/p>\n
<\/p>\n
\n
# Function definition with multiple parameters and default values<\/span>\r\ndef<\/span> multiply_numbers<\/span>(x, y=<\/span>1<\/span>):\r\n    return<\/span> x *<\/span> y\r\n\r\n# Calling the function<\/span>\r\nresult =<\/span> multiply_numbers(4<\/span>, 6<\/span>)\r\nprint<\/span>(result)  # Output: 24<\/span>\r\n\r\nresult =<\/span> multiply_numbers(5<\/span>)\r\nprint<\/span>(result)  # Output: 5 (default value of y is used)<\/span>\r\n<\/pre>\n<\/div>\n
 <\/p>\n\n<\/div>
Practice<\/h2>\n
\n\n
Resources<\/h3>\n
Practice<\/strong><\/p>\n
You can practice writing your own functions using these Python functions challenges.<\/a><\/p>\n
 <\/p>\n
Exam Questions<\/p>\n
June 16 Paper 22 Questions 2,3<\/a><\/p>\n
 <\/p>\n<\/div><\/div>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
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<\/h2>\n
\n\n","protected":false},"excerpt":{"rendered":"
Functions In Python, functions are a way to group a set of statements together to perform a specific task. They allow you to organize your code into reusable blocks, making it easier to read, understand, and maintain. All functions must return a value using the return statement, otherwise it isn’t function – it’s a procedure.… Read More »Functions & Procedures<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"\nFunctions & Procedures - Edexcel iGCSE Computer Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/functions-procedures\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Functions & Procedures - Edexcel iGCSE Computer Science\" \/>\n<meta property=\"og:description\" content=\"Functions In Python, functions are a way to group a set of statements together to perform a specific task. 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