Question

我是初学者，我需要一些帮助。我无法弄清楚我做错了什么。

我必须制作一个程序来读取从0到100的值的检查分数集合，并停止处理-1。输入并验证分数。程序应计算并打印通过次数（＆gt; = 50）和失败次数（0-50）。输入分数-1时，将显示通过次数和失败次数。

<script>
var score = 0;
var passCount = 0;
var failCount = 0;

score = parseInt(prompt("Input score between 1-100, -1 to quit","0"));

while (score !< 0){
    if (score >= 50 || score <= 100){
    passCount = passCount + 1;
    alert ("You passed! Pass count = "+passCount+"Fail count = "+failCount);
    }
    else
    if (score<50){
    failCount = failCount + 1;
    alert ("You failed! Pass count = "+passCount+"Fail count = "+failCount);
    }
    else
    if (score > 100){
    alert ("Invalid number");
    }
    score = parseInt(prompt("Input score between 1-100, -1 to quit","0"));
}
document.write ("Total: Passes - "+passCount+"Fails "+failCount);
</script>

Answer 1

要完成的更改：

while (score >= 0)

没有运营商!<。您必须使用while (! (score<0))或while (score >=0)或while (score != -1)
if（得分> = 50 &&得分＆lt; = 100）

由于您在原始代码中使用|| OR运算符，因此控件永远不会转到failCount分支。需要使用AND运算符才能使条件有效。

最终代码：

<script>
var score = 0;
var passCount = 0;
var failCount = 0;

score = parseInt(prompt("Input score between 1-100, -1 to quit","0"));

while (score >= 0){
    if (score >= 50 && score <= 100){
    passCount = passCount + 1;
    alert ("You passed! Pass count = "+passCount+"Fail count = "+failCount);
    }
    else
    if (score<50){
    failCount = failCount + 1;
    alert ("You failed! Pass count = "+passCount+"Fail count = "+failCount);
    }
    else
    if (score > 100){
    alert ("Invalid number");
    }
    score = parseInt(prompt("Input score between 1-100, -1 to quit","0"));
}
document.write ("Total: Passes - "+passCount+"Fails "+failCount);
</script>

Answer 2

尝试更改条件while(score != -1)

Sentinel计划不起作用

2 个答案: