<\/span><\/h4>\nThe program code gets modified according to the specification by the algorithm.<\/p>\n
We add an additional prompt for information and a conditional statement that accounts for this information to calculate the correct age.<\/p>\n
Note the indentation of the code. The contents of the code block is always indented by 1. Since the if\/else statements contain code blocks that are already inside the main function’s code block, they get an additional indentation. This means that it’s very easy and quick to for us to glance over and understand the structure of the code, helping code maintainability.<\/p>\n
As mentioned before, there is one edge case, where this formula will be incorrect. Can you spot it?<\/p>\n
\/**\r\n * File: hello_conditional.c\r\n * Author: Risto Heinsar\r\n * Created: 01.09.2014\r\n * Edited: 23.07.2025\r\n *\r\n * Description: This is the second hello example showing conditional program\r\n * flow.\r\n *\/\r\n\r\n\/\/ Includes the standard input-output library (printf, scanf)\r\n#include <stdio.h>\r\n\r\n\/\/ The program always starts from the main() function\r\nint main(void)\r\n{\r\n \/\/ Print the greeting in the terminal.\r\n printf(\"Hello!\\n\");\r\n printf(\"This program determines the approximate age of a person\\n\\n\");\r\n\r\n \/\/ Variable declaration, type int (integer), variable name \"year\"\r\n int year;\r\n \r\n \/\/ Prompt the user and read the year of birth as integer\r\n printf(\"Please enter your year of birth: \");\r\n scanf(\"%d\", &year); \r\n\r\n int hasCelebratedBirthday;\r\n printf(\"Enter 1 if you've already had your birthday this year\\n\");\r\n printf(\"Enter 0 if you have not.\\n\");\r\n scanf(\"%d\", &hasCelebratedBirthday);\r\n\r\n \/\/ Calculating age depending on the user's birthday\r\n \/\/ Note: There is a bug in this code that only triggers on an edge case.\r\n \/\/ Can you find it?\r\n int age;\r\n if (hasCelebratedBirthday)\r\n {\r\n age = 2025 - year;\r\n }\r\n else\r\n {\r\n age = 2025 - year - 1;\r\n }\r\n \r\n \/\/ Printing the result\r\n printf(\"You are %d years of age\\n\", age);\r\n\r\n \/\/ The program finished successfully. Integer 0 indicates success.\r\n return 0; \r\n}\r\n<\/pre>\n <\/p>\n","protected":false},"excerpt":{"rendered":"
This example is the written version of the first lesson with additional commentary that is intended to support you in going over the code that you built during the class. This example contains the following Part 1 of the hello.c code with linear flow Part 2 of the hello.c code with conditional flow Syntax and … Loe edasi hello.c (2025)<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1521,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/code-width-wide.php","meta":{"footnotes":""},"class_list":["post-10325","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/pages\/10325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/comments?post=10325"}],"version-history":[{"count":10,"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/pages\/10325\/revisions"}],"predecessor-version":[{"id":10484,"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/pages\/10325\/revisions\/10484"}],"up":[{"embeddable":true,"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/pages\/1521"}],"wp:attachment":[{"href":"https:\/\/blue.pri.ee\/ttu\/wp-json\/wp\/v2\/media?parent=10325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}