The bool type is one of the c++ fundamental data type , a fundamental data type has a cpu hardware mapping .
The bool type is used for boolean values . A boolean value is the result of a … Read More
What is an atom , a symbol , a cons , and a list in lisp ?
A symbol is an atom , an atom is everything which is not a cons . A list is anything which is enclosed by parenthesis .
(1 2 3 ) (defun square(num ) (* num num ) ) ;;;Two… Read More
A Solution for undefined symbols error when compiling C++ files using cc
When compiling C++ files using cc , you might face an error of :
/*Error output under macOS .*/
Undefined symbols for architecture x86_64:
"std::__1::locale::use_facet(std::__1::locale::id&) const", referenced from:
std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::__put_character_sequence<char, std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*, unsigned … Read More How to solve package org.apache.http does not exist ?
When compiling a java file you might face an error of :
error: package org.apache.http does not exist
Just download the Apache HttpComponents , and select the appropriate version . For example the HttpClient 5.0.3 version , or the … Read More
Cordova plugin camera a tutorial
To capture and select images or videos , using cordova , the plugin cordova-plugin-camera can be used .
$ cordova create demo-camera com.twiserandom.mobileapps.demo.camera "Demo Camera" # Create an application , in a folder named # demo-camera , with an… Read More
Type qualifiers : const , volatile , in C++ a tutorial
Getting device information using cordova !
Getting battery status using Cordova !
There are two plugins to get battery status using Cordova, the first one is called phonegap-plugin-battery-status , and the second one is cordova-plugin-battery-status .
phonegap-plugin-battery-status
The phonegap-plugin-battery-status plugin is deprecated , but it is still working .
It can … Read More
Storage classes in C++ a tutorial
The storage classes in C++ are : auto , static , extern , mutable , register , and thread_local . They are used in declarations to specify how a definition takes place .
Definition for a variable , is … Read More
Scope in C++ , a tutorial ?
What is a scope ?
A scope is where an identifier is declared , it can be thought of , as containing a list of identifiers . There are multiple scopes in C++ , hence multiple places , where … Read More