Question

我做了一个可以在Pi上测验您的功能。对于正确书写的每个数字，您将获得一半的分数。但是，即使我只是键入“ 3”，也会说我做错了。请帮忙。

function pi() {
  var piWithoutDecimals = 31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679;
  var yourAnswer = prompt("Pi Bonus! Half of a point for every digit of pi that you can write from memory!");
  var yourAnswerNum = parseInt(yourAnswer);
  var yourAnswerMultiplier = yourAnswerNum.toString().split(".");
  var yourAdjustedAnswer = yourAnswerNum*(10**parseInt(yourAnswerMultiplier));
  var yourAdjustedAnswerCount = yourAdjustedAnswer.toString().length;
  var yourSectionOfpiWithoutDecimals = piWithoutDecimals.toString().substring(0,parseInt(yourAdjustedAnswer-1));
  if(yourSectionOfpiWithoutDecimals==yourAnswerNum) {
    alert("Nice!! You listed "+yourAdjustedAnswerCount+" digits of Pi, and so you get "+Math.floor((yourAdjustedAnswerCount)/2)+" points!")
    points+=Math.floor((yourAdjustedAnswerCount)/2);
  } else { alert("Good try, but you got one or more digits incorrect.") }
}

pi()

Answer 1

您首先在此行出错：

var yourAnswerMultiplier = yourAnswerNum.toString().split(".");

如果您将此值记录为例如输入"314"，您将获得数组["314"]（您可能需要.split("")）。从那里开始，yourAdjustedAnswer将为无穷大（因为10 ** 314太大，只会溢出）。失败了，这显然不是您想要的。

建议，尝试使用浏览器/ IDE的开发人员工具逐步执行一个简单示例，并仔细观察每个步骤是否符合您的期望。

@Orkhan Alikhanov的回答也可能提供一些提示。

    function pi() {
      var piWithoutDecimals = 31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679;
      var yourAnswer = prompt("Pi Bonus! Half of a point for every digit of pi that you can write from memory!");
      var yourAnswerNum = parseInt(yourAnswer);
      var yourAnswerMultiplier = yourAnswerNum.toString().split(".");
      var yourAdjustedAnswer = yourAnswerNum*(10**parseInt(yourAnswerMultiplier));
      console.log(yourAdjustedAnswer)
      var yourAdjustedAnswerCount = yourAdjustedAnswer.toString().length;
      var yourSectionOfpiWithoutDecimals = piWithoutDecimals.toString().substring(0,parseInt(yourAdjustedAnswer-1));
      if(yourSectionOfpiWithoutDecimals==yourAnswerNum) {
        alert("Nice!! You listed "+yourAdjustedAnswerCount+" digits of Pi, and so you get "+Math.floor((yourAdjustedAnswerCount)/2)+" points!")
        points+=Math.floor((yourAdjustedAnswerCount)/2);
      } else { alert("Good try, but you got one or more digits incorrect.") }
    }

    pi()

Answer 2

您可能有一个简单的方法。

以字符串形式定义您的pi
接受用户输入
检查您的pi字符串是否以用户输入的内容开头
删除小数点.，并计数长度以获取正确输入的位数。
显示测验的输出

function pi() {
  const pi = "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679";
  const yourAnswer = prompt("Pi Bonus! Half of a point for every digit of pi that you can write from memory!");
  if(pi.startsWith(yourAnswer)) {
    const yourAdjustedAnswerCount = yourAnswer.replace('.', '').length;
    alert(`Nice!! You listed ${yourAdjustedAnswerCount} digits of Pi, and so you get ${Math.floor(yourAdjustedAnswerCount / 2)} points!`)

  } else { 
    alert("Good try, but you got one or more digits incorrect.")
  }
}

pi()

我的职能部门总是告诉我我的问题错了。为什么？

2 个答案: