ncovercash

Getting Started with Valgrind

The cs-intro.ua.edu testing server now comes with the utility Valgrind preinstalled.

Valgrind is a utility which is able to detect memory leaks and provide information about memory-related errors (segmentation faults).

Valgrind supports a small set of linux-based operating systems and, where it is installable, it is infamously difficult to install. Therefore, the server's version is extremely helpful for testing.

This guide will show how to use Valgrind on the cs-intro server.

ncovercash

#include <iostream>
#include <unordered_map>
#include <vector>

#include "CDA.cpp"

using namespace std;

bool nameExists(vector<string> list, string name) {
	for (int i = 0; i < list.size(); i++) {

ncovercash

<?php

case "ADDSKU":
	$skus = $dbh->query("SELECT * FROM `".DB_SKU_NAME_TABLE."`;")->fetchAll();

	$skuAssocArray = [];
	foreach ($skus as $sku) {
		$skuAssocArray[$sku["SKU"]] = $sku["NAME"];
	}

ncovercash

<?php
/**
 * Build multipart/form-data
 *
 * @param array @$data Data
 * @param array @$files 1-D array of files where key is field name and value if file contents
 * @param string &$contentType Retun variable for content type
 *
 * @return string Encoded data
 */

ncovercash

	String[] buttonTexts = new String[] {"m+", "m-", "mc", "mr", "ms", "CE/C", "¹⁄ᵪ", "x²", "√", "⁺⁄₋", "rand", "AC", "floor", "ceil", "++", "--", "round", "eᵡ", "sin", "cos", "tan", "", "DEG", "SCI", "sin⁻¹", "cos⁻¹", "tan⁻¹", "e", "10ᵡ", "÷", "log", "ln", "(", ")", "", "✕", "^", "π", "7", "8", "9", "–", "x³", "∛", "4", "5", "6", "+", "abs", "%", "1", "2", "3", "=", "OFF", "isint", "0", ".", "(−)"};

ncovercash

	public static String expandNumToDigits(int in, int digits) {
		String stringIn = ""+in;
		while (stringIn.length() < digits) {
			stringIn = "0"+stringIn;
		}
		return stringIn;
	}

ncovercash

<?php

class CardDeck {
	public $deck = Array();

	public function __construct(int $size) {
		for ($i=1; $i <= $size; $i++) { 
			$this->deck[] = Array($i);
		}

ncovercash

https://github.com/smileytechguy/sample_projects
https://github.com/smileytechguy/sample_projects/search?l=Java

100_doors					-	intermediate challenge, requires multiple loops and a boolean array
guess_user_number			-	binary search, computer guesses number, user says higher/lower
even_fibonacci				-	find a sum of the even numbers in the first x numbers in the fibonacci sequence
palindromes					-	there are several in GH, ex largest_palindrome_product, however string palindromes are better
									you could make it indifferent to cases, spaces, etc
number_letter_counts		-	thing about getting the number of letters in a spelled out number (one, two etc)
number_spiral				-	hard. extra credit if you give it. generating a spiral of numbers in a 2d array

ncovercash

Human fills spot 2

0 returns a score of -10
1 returns a score of 0
3 returns a score of -10
4 returns a score of 0
5 returns a score of -10
6 returns a score of 0
7 returns a score of -10
8 returns a score of -10

ncovercash

Why photos taken on a modern device may appear rotated incorrectly:

Originally written as an explainiation for my Precalculus teacher as to why student's work render incorrectly in Google Classroom.

Image metadata (EXIF)

Exchangeable image file format (officially Exif, according to JEIDA/JEITA/CIPA specifications) is a standard which allows for metadata to be stored in an image or audio file. This is important, as it can store information about the image besides the image itself. Common applications include things such as date taken, shutter speed, camera type, or location, however any aribtrary key and value may be stored. A few keys are required, such as the use of the Discrete Cosine Transformation (DCT) on image/jpeg files, various algorithms and codecs used for processing RIFF files such as audio/wav A photo taken on a modern device, such as an iPhone or similar, can contain dozens if not hundreds of these tags, however those found in most images are things such as bit depth, colour palette,