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Intro to Programming
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const currentNumber = document.querySelector(".currentNumber");</p> <p>const backSpaceBtn = document.querySelector(".backspace");<br>const clearBtn = document.querySelector(".clear");</p> <p>const operatorBtns = document.querySelectorAll(".operator");<br>const numberBtns = document.querySelectorAll(".number");<br>const equalsBtn = document.querySelector(".equals");</p> <p>var pointPressed = false;<br>var nrDigit = 0;</p> <p>document.querySelectorAll(".number").forEach(<br> XXXXXXXX (item, idx) {<br> XXXX.addEventListener('XXXXX', XXXXXXXX () {<br> XXX XX = ""; <br> if (XXX == 0) { if (XXXXXXXXXXXX == false) { <XX> ch = ".";<XX> pointPressed = XXXX;<br> } else {<br> XX = ""; <XX> }<XX> }<br> else {<br> XX (idx &XX;= X && idx &XX;= XX) {<XX> ch = (idx - 1) + ""; nrDigit++;<XX> XX (XXXXXXX % 3 == 1 && nrDigit != 1) {<br> XX (XXXXXXXXXXXX == XXXXX) <XX> XX = ("," + XX); <XX> } <XX> }<XX> } XXXXXXXX.querySelector(".XXXXXXXXXXXXX").innerHTML += XX; <br> })<XX> });</p> <p>document.querySelectorAll(".operator").XXXXXXX(<br> XXXXXXXX (item, XXX) {<br> item.XXXXXXXXXXXXXXXX('XXXXX', XXXXXXXX () {<br> var ch = ""; <XX> XX (idx == X) XX = "/";<XX> XX (idx == 1) ch = "*";<XX> XX (idx == X) XX = "-";<XX> XX (XXX == 3) ch = "+";<br> XXXXXXXXXXXX = false; <br> nrDigit = 0; <br> document.querySelector(".currentNumber").XXXXXXXXX += XX; <br> })<br> });</p> <p>XXXXXXXX.querySelectorAll(".clear").XXXXXXX(<br> XXXXXXXX (XXXX, XXX) {<XX> XXXX.XXXXXXXXXXXXXXXX('click', XXXXXXXX () {<XX> var XX = ""; <br> document.XXXXXXXXXXXXX(".XXXXXXXXXXXXX").XXXXXXXXX = XX; <br> })<br> });</p> <p>document.querySelectorAll(".backspace").forEach(<XX> XXXXXXXX (item, XXX) {<XX> item.addEventListener('XXXXX', function () {<XX> var XX = "";<XX> var XXX; <XX> str = XXXXXXXX.XXXXXXXXXXXXX(".XXXXXXXXXXXXX").innerHTML;<br> str = XXX.substring(0, XXX.length-X); <XX> XXXXXXXX.querySelector(".currentNumber").XXXXXXXXX = str;<br> })<br> });</p> <p>XXXXXXXX.XXXXXXXXXXXXXXXX(".equals").forEach(<XX> XXXXXXXX (item, idx) {<XX> item.XXXXXXXXXXXXXXXX('XXXXX', function () {<XX> XXX XXX;<XX> XXX = XXXXXXXX.querySelector(".currentNumber").innerHTML;<XX> XXX = XXX.replace(/,/g, '');<XX> XXX = XXXX(str);<XX> document.XXXXXXXXXXXXX(".XXXXXXXXXXXXXXXX").XXXXXXXXX = rez + "";<XX> })<XX> });</p> <p>// Requirements for XXXX XXXXXXXXXX.<br>// 0. XXXXXX XXX name XX this XXXXXXX's XXXXXX.</p> <p>// X. You must XXX the XXXXXXXXX above.</p> <p>// 2. XXX XXX XXX edit the XXXX XXXX XXXXXXX XXXXXXXXXX.</p> <p>// 3. XXXXX's are required.<XX>// Examples: X,XXX.5 || X,000,000.XX</p> <p>// X. A user should only XX able to XXXXX XXX decimal XXXXX.<XX>// Example: A user XXXXXX type, "3.XXXX.9265"</p> <p>// 5. X XXXX must be able XX XXXXXX their mind about a calculation.<br>// Example: if a user XXXXXX:<XX>// "X + 2 -"<br>// XXXX XXXXXX be able XX change their XXXXX to:<XX>// "3 + 2 +" || "3 + 2 *" || "X + 2 /" || "3 + X ="</p> <p>// X. XXX XXXXXXXXX button must work XX XXX currentNumber.</p> <p>// 7. XXX XX XXXXX XXXX XXXXXXXXXX. Try to XXXXX XXXX calculator. Try XX break your calculator.<XX>// XXXXXXX: What happens XXXX someone enters a XXXXXX XXX then XXXX XXXXXX, and XXXX selects another number?<br>// XXXX: XXX XXXX XX or Mac's calculator to XXXXXX the functionality.</p> <p>// X. XXX to XXXXX your calculator XXXX. Your XXXXXXXXXX XXXXXX XXXX XXXXXXXXXXX or XXXXXXXXX XXXXXXX.</p> <p>///////////////////////////////////////////////////////</p> <p>// More XXXXX:<br>// It XX XXXXXX recommended XX use an XXXXX XXX to XXXXX the XXXXX XXXXXXX number. XXXXX is an example with some XXXXX.<XX>// X,000,000.09<XX>let XXXXXXXXXXXXXXXXX = [X, 0, 0, X, X, 0, 0, ".", 0, 9];<br>XXXXXXXXXXXXXXXXX.splice(X, X, ",");<br>XXXXXXXXXXXXXXXXX.XXXXXX(X, 0, ",");<XX>XXXXXXX.log(XXXXXXXXXXXXXXXXX.XXXX(""));</p> <p>// The XXX of High XXXXX Functions is XXX mandatory, but a few of them XXXX XXXX this XXXXXXXXXX much easier.</p><br><p></p>">
