How do char and int work in C++ -


may i'm going ask stupid question, want confirm how char works? let me explain examples want ask. let suppose declare char variable , input 6 or integer character.

#include <iostream> using namespace std; int main(){     char a;     cin >> a;     cout << a*a; // know here input's ascii value multiply     return 0; }

same integer input 6

#include <iostream> using namespace std; int main(){     int a;     cin >> a;     cout << a*a; // why compiler not take input's ascii value here?     return 0; }

i think question clear.

char fundamental data type, of size 1 byte (not 8bits!!!), capable of representing @ least ascii code range of characters. so, example, char x = 'a'; stores ascii value of 'a', in case 97. however, ostream operators overloaded "know" how deal char, , instead of blindly displaying 97 in line cout << x; display ascii representation of character, i.e. 'a'.

however, whenever a * a, compiler performs what's called integral promotion, , implicitly converts data in char int. so, compiler, expression a * a translated (int)a * (int)a, result of 97 * 97, end displaying 9409.

note compiler char , int 2 different types. can differentiate between two. operator<< displays character when input of type char or of type implicitly convertible char.


Comments

Post a Comment

Popular posts from this blog

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

php - Bypass Geo Redirect for specific directories -

i'm trying bypass redirect specific url within site. wondering if might able help. the code below code use, original urls replaces example.com i'd able access http://example.com/admin without redirect occuring. is there way this, , there way using own ip? function country_geo_redirect() { $country = getenv('http_geoip_country_code'); if ($country == "us" ) { wp_redirect("http://usa.example.com/"); exit; } else if ($country == "gb" ) { wp_redirect("http://uk.example.com/"); exit; } } add_action('init', 'country_geo_redirect'); you can bypass redirection code if server found ip address. if ip address == <my ip address> ' nothing here else country_georedirect() end if
Read more

php - .htaccess mod_rewrite for dynamic url which has domain names -

i want convert url ex:( example.com/link.php?url=facebook.com ) ( example.com/facebook.com.php ) how can using .htaccess. or there other process make job easier ? i tried adding script .htaccess file options +followsymlinks rewriteengine on rewriterule url-(.*)\.htm$ link.php?url=$1 but converting url adding "url-" ( example.com/url-facebook.com.php ) i want remove "url-" , want make ( example.com/facebook.com.php ) rewriteengine on rewritecond %{the_request} ^get.*link\.php\?url\= [nc] rewritecond %{request_uri} !/system/.* [nc] rewriterule (.*?)link\.php\?url\=/*(.*) /$1$2 [r=301,ne,l] not sure how above work edit of used use remove index.php url
Read more