WebProgramming/practice9-10.html at main · huheyun/WebProgramming · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>계산기 만들기</title>
    <style>
        input{
            width: 99%;
        }
        .calculator {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
        width: 100%;
        }
        button{
            width: 100px;
        }
    </style>
    <script>
        function button(c){
            let input = document.getElementById('text');
            if(c=="="){
                input.value = eval(input.value);
            }
            else if(c=="ce"||c=="c"){
                input.value="0";
            }
            else if(c=="back"){
                input.value=input.value.slice(0,-1);
            }
            else if(c!="none"){
                if(input.value=='0'){
                    input.value='';
                }
                input.value+=c;
            }
        }
    </script>
</head>
<body>
    <h2>계산기 만들기</h2>
    <hr>
    <input id="text" type="text" value="0" onclick="this.value=''"><br><br>
    <div class="calculator">
        <button onclick="button('back')">BACK</button>
        <button onclick="button('ce')">CE</button>
        <button onclick="button('c')">C</button>
        <button onclick="button('=')">=</button>

        <button onclick="button('7')">7</button>
        <button onclick="button('8')">8</button>
        <button onclick="button('9')">9</button>
        <button onclick="button('/')">/</button>

        <button onclick="button('4')">4</button>
        <button onclick="button('5')">5</button>
        <button onclick="button('6')">6</button>
        <button onclick="button('*')">*</button>

        <button onclick="button('1')">1</button>
        <button onclick="button('2')">2</button>
        <button onclick="button('3')">3</button>
        <button onclick="button('-')">-</button>

        <button onclick="button('0')">0</button>
        <button onclick="button('+')">+</button>
        <button onclick="button('none')">NONE</button>
        <button onclick="button('none')">NONE</button>
    </div>
</body>
</html>