如何解决分数较低的成绩计算器方程式
我正在尝试创建一个计算器,当您输入积分时,您在课堂上获得的积分总数很多,而我目前正在研究字母的等级,百分比和数量。您需要升入下一年级的分数。 例如95/100
95%
所需积分= 5
我想对需要的点做同样的事情,但要相反。因此,对于同一示例,
损失的积分= 5
如果有帮助,我目前有当前“需要的分数”脚本,但我真的无法弄清楚这一点,幸运的是,对于学校项目而言,并不是一个单独项目,因此我可以学习如何编码
这是所需积分的代码
var pointsNeeded = totalGrade.value - grade.value;
if (gradePercentage > 100) {
pointsNeeded = pointsNeeded * -1;
document.getElementById("pointsNeeded").innerHTML = "You can lose " + pointsNeeded + " point(s) and still have 100%";
}
else {
document.getElementById("pointsNeeded").innerHTML = pointsNeeded;
}
}
else if (gradePercentage < 89,gradePercentage > 79) {
var pointsNeeded = Math.round(10 * ((totalGrade.value * 0.9) -
grade.value)) / 10;
document.getElementById("pointsNeeded").innerHTML = pointsNeeded;
}
else if (gradePercentage < 79,gradePercentage > 69) {
var pointsNeeded = Math.round(10 * ((totalGrade.value * 0.8) -
grade.value)) / 10;
document.getElementById("pointsNeeded").innerHTML = pointsNeeded;
}
else if (gradePercentage < 69,gradePercentage > 59) {
var pointsNeeded = Math.round(10 * ((totalGrade.value * 0.7) -
grade.value)) / 10;
document.getElementById("pointsNeeded").innerHTML = pointsNeeded;
}
else if (gradePercentage < 59) {
var pointsNeeded = Math.round(10 * ((totalGrade.value * 0.6) -
grade.value)) / 10;
document.getElementById("pointsNeeded").innerHTML = pointsNeeded;
}
gradePercentage是实际百分比,totalGrade是完整成绩,而grade是您拥有的成绩。
这些也是成绩值,
var gradeLetter = "A"
document.getElementById("result").innerHTML = gradeLetter + " " + result + "%";
}
if (gradePercentage > 79.9,gradePercentage < 90) {
var gradeLetter = "B"
document.getElementById("result").innerHTML = gradeLetter + " " + result + "%";
}
if (gradePercentage > 69.9,gradePercentage < 80) {
var gradeLetter = "C"
document.getElementById("result").innerHTML = gradeLetter + " " + result + "%";
}
if (gradePercentage > 59.9,gradePercentage < 70) {
var gradeLetter = "D"
document.getElementById("result").innerHTML = gradeLetter + " " + result + "%";
}
if (gradePercentage < 59.9) {
var gradeLetter = "F"
document.getElementById("result").innerHTML = gradeLetter + " " + result + "%";
}
解决方法
这段代码很不言自明:
let startingPoints = 952.3 // How many points you got on the test
let maxPoints = 1049 // Max possible points you could have gotten
// Your grade (0-100%):
let gradePercentage = 100 * startingPoints / maxPoints; // E.g. 90.7816968541468
// How much less you'd need (as a percentage) to get the next lowest grade:
let extraPercentage = ( gradePercentage % 10 ) + 0.01; // E.g. 0.7916968541468015
// Your new grade (as a percentage) if you bumped it down:
let newGrade = gradePercentage - extraPercentage; // E.g. 89.99
// How many points you'd have to reduce your score by to bump it down to the next lowest
let extraPoints = ( extraPercentage / 100 * maxPoints ) // E.g. 8.304899999999947
// What your score would be if you bumped it down to the next level:
let newExtraPoints = startingPoints - extraPoints; // E.g. 943.9951
console.log( `Your grade is ${gradePercentage}% (${startingPoints} points out of a possible ${maxPoints}). If you subtract ${extraPercentage}% (or ${extraPoints} points),your grade will be ${newGrade}% (${newExtraPoints} points)` );
唯一的棘手之处是我们要添加0.01,从技术上讲,它可以是0.001或0.0001,或者...好吧,我们必须添加 something 使其低于限制,并且没有设置“正确”的数量,我选择0.01是因为效果很好。
示例输出:
Your grade is 90.7816968541468% (952.3 points out of a possible 1049).
If you subtract 0.7916968541468015% (or 8.304899999999947 points),your grade will be 89.99% (943.9951 points)
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