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functions.js
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functions.js
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let screen = document.getElementById('screen'),
buttons = document.querySelectorAll('button'),
screenValue = '',
expression = '';
for (item of buttons) {
item.addEventListener('click', () => {
let btnTxt = event.target.innerText;
if (btnTxt == 'C') {
screenValue = '';
expression = '';
screen.value = screenValue;
}
else if (btnTxt == '=') {
screen.value = eval(expression);
screenValue = screen.value;
expression = screen.value;
}
else if (event.target.getAttribute('id') == 'multiply') {
screenValue += btnTxt;
expression += '*';
screen.value = screenValue;
}
else if (event.target.getAttribute('id') == 'divide') {
screenValue += btnTxt;
expression += '/';
screen.value = screenValue;
}
else if (btnTxt == 'Del') {
screenValue = screenValue.slice(0, screenValue.length - 1);
expression = expression.slice(0, expression.length - 1);
screen.value = screenValue;
}
else {
screenValue += btnTxt;
expression += btnTxt;
screen.value = screenValue;
}
})
}