{"id":1524,"date":"2015-09-01T00:01:06","date_gmt":"2015-09-01T07:01:06","guid":{"rendered":"http:\/\/c-for-dummies.com\/blog\/?p=1524"},"modified":"2015-09-08T07:57:58","modified_gmt":"2015-09-08T14:57:58","slug":"flip-that-bit","status":"publish","type":"post","link":"https:\/\/c-for-dummies.com\/blog\/?p=1524","title":{"rendered":"Flip That Bit"},"content":{"rendered":"

All the nonsense that takes place in programming happens because it’s possible to change the value of a bit from 0 to 1 and back again. The general concept is known as a toggle switch<\/em>: The item can be set and reset between on and off positions.
\n
\nMost C language programmers use an int<\/em> variable as a toggle switch. The variable is set to 1 or 0 for TRUE\/FALSE or On\/Off — however you want to look at it.<\/p>\n

You can also use the _Bool<\/em> variable type, providing that your compiler is C99 compatible, which in 2015 it should be.<\/p>\n

_Bool<\/em> comes from Boolean (boo’-lee-an<\/em>), which is named after British mathematician George Boole. I find it enjoyable to say the word, “Boolean.”<\/p><\/blockquote>\n

Using the _Bool<\/em> variable type isn’t as popular as using an int<\/em>, probably because most C programmers are of the grizzled, bearded, sandal-wearing, Unix variety and they grumble and grouse about the underscore keywords introduced with the C99 standard.<\/p>\n

Whatever.<\/p>\n

Here is sample code that makes used of the _Bool<\/em> variable type:<\/p>\n

\r\n#include <stdio.h>\r\n\r\nint main()\r\n{\r\n    _Bool bit;\r\n\r\n    bit = 0;\r\n    printf(\"The value of _Bool 'bit' is %d\\n\",bit);\r\n    printf(\"The size of _Bool 'bit' is %lu\\n\",sizeof(bit));\r\n\r\n    return(0);\r\n}<\/pre>\n
Here’s the output:<\/p>\n
The value of _Bool 'bit' is 0\r\nThe size of _Bool 'bit' is 1<\/code><\/pre>\n
For this month’s exercise, you must work with an array of 10 Boolean values:<\/p>\n
_Bool toggle[10] = {\r\n    1, 0, 1, 1, 0, 1, 1, 0, 1, 0\r\n};<\/code><\/pre>\n
Your code must take each Boolean value in the array and flip it, changing 1 to 0 and 0 to 1. This is a pretty basic programming operation, and I can imagine several ways to accomplish this task.<\/p>\n
Don’t let the _Bool<\/em> variable type confuse you. The array could very well just be int<\/em> values and the result would be the same.<\/p>\n
Click here<\/a> to view my solution. As usual, please try this Exercise on your own before you peek at what I’ve done.<\/p>\n","protected":false},"excerpt":{"rendered":"
It’s one of the most basic processor operations. Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1524","post","type-post","status-publish","format-standard","hentry","category-exercise"],"_links":{"self":[{"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1524","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1524"}],"version-history":[{"count":5,"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1524\/revisions"}],"predecessor-version":[{"id":1561,"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1524\/revisions\/1561"}],"wp:attachment":[{"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c-for-dummies.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}