-
Notifications
You must be signed in to change notification settings - Fork 0
/
app.js
81 lines (75 loc) · 1.81 KB
/
app.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
let buffer = "0";
let finalSum = 0;
let previusOperation;
const screen = document.querySelector('.screen');
document.querySelector(".calc-buttons").addEventListener("click", function(event){
buttonClick(event.target.innerText);
});
function buttonClick(value){
if(isNaN(parseInt(value))){
handleSymbol(value);
} else{
handleNumber(value);
}
rerender();
}
function handleNumber(value){
if (buffer === "0"){
buffer = value;
} else{
buffer += value;
}
}
function handleSymbol(value){
switch(value){
case "C":
buffer = "0";
previusOperation = 0;
finalSum = 0;
break;
case "←":
if(buffer.length === 1){
buffer = 0;
} else{
buffer = buffer.substring(0, buffer.length - 1)
}
break;
case "=":
if(previusOperation === null){
return;
} else{
flushOperation(parseInt(buffer))
previusOperation = value;
buffer = "" + finalSum;
finalSum = 0;
break;
}
default:
handleMath(value);
break;
}
}
function flushOperation(intBuffer){
if(previusOperation === "+"){
finalSum += intBuffer;
} else if (previusOperation === "-"){
finalSum -= intBuffer;
} else if (previusOperation === "÷"){
finalSum /= intBuffer;
} else{
finalSum *= intBuffer;
}
}
function handleMath(value){
const intBuffer = parseInt(buffer);
if(finalSum === 0){
finalSum = intBuffer;
} else{
flushOperation(intBuffer);
}
previusOperation = value;
buffer = "0";
}
function rerender(){
screen.innerText = buffer;
}