ATM

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// A T M 
var money = 100;
var price = 0;
while (num != 4) {
var num = prompt('请输入你要的操作:\n1.存钱\n2.取钱\n3.显示余额\n4.退出')
switch (num) {
case '1':
price = prompt('输入要存的钱数;');
money = money + parseFloat(price);
alert('您的余额;' + money);
continue;
case '2':
price = prompt('输入你要取出的钱: ');
money = money - parseFloat(price);
alert('您的余额' + money);
continue;
case '3':
alert('您的余额:' + money);
continue;
case '4':
alert('正在退出...')
break;
}
}