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index.js
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index.js
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'use strict';
let numberElement = document.getElementById('number');
let expressionElement = document.getElementById('expression');
let result = 0;
function calculate(currentElement) {
switch (currentElement.id) {
case 'zero-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '0';
break;
case 'one-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '1';
else numberElement.innerHTML = '1';
break;
case 'two-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '2';
else numberElement.innerHTML = '2';
break;
case 'three-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '3';
else numberElement.innerHTML = '3';
break;
case 'four-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '4';
else numberElement.innerHTML = '4';
break;
case 'five-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '5';
else numberElement.innerHTML = '5';
break;
case 'six-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '6';
else numberElement.innerHTML = '6';
break;
case 'seven-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '7';
else numberElement.innerHTML = '7';
break;
case 'eight-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '8';
else numberElement.innerHTML = '8';
break;
case 'nine-btn':
if (numberElement.innerHTML != '0') numberElement.innerHTML += '9';
else numberElement.innerHTML = '9';
break;
case 'plus-btn':
expressionElement.innerHTML =
numberElement.innerHTML + currentElement.innerHTML;
numberElement.innerHTML = '0';
break;
case 'minus-btn':
expressionElement.innerHTML =
numberElement.innerHTML + currentElement.innerHTML;
numberElement.innerHTML = '0';
break;
case 'times-btn':
expressionElement.innerHTML =
numberElement.innerHTML + currentElement.innerHTML;
numberElement.innerHTML = '0';
break;
case 'divide-btn':
expressionElement.innerHTML =
numberElement.innerHTML + currentElement.innerHTML;
numberElement.innerHTML = '0';
break;
case 'equals-btn':
if (numberElement.innerHTML != '0') {
let expression = (expressionElement.innerHTML +=
numberElement.innerHTML);
expression = expression
.replaceAll('×', '*')
.replaceAll('÷', '/')
.replaceAll('−', '-');
try {
let getResult = new Function('return ' + expression);
numberElement.innerHTML = getResult();
expressionElement.innerHTML += ' = ';
} catch (error) {
numberElement.innerHTML = '0';
expressionElement.innerHTML = '';
}
}
break;
case 'plusminus-btn':
if (numberElement.innerHTML.indexOf('-') == -1)
numberElement.innerHTML = '-' + numberElement.innerHTML;
else
numberElement.innerHTML = numberElement.innerHTML.replace('-', '');
break;
case 'point-btn':
numberElement.innerHTML += '.';
break;
case 'delete-btn':
expressionElement.innerHTML = '';
break;
case 'clear-btn':
expressionElement.innerHTML = '';
numberElement.innerHTML = '0';
break;
default:
console.log('Key entered not available!');
}
}