我正在尝试创建一个程序来确定输入的成绩是否正在通过或失败。当用户输入-1时它停止。一旦用户输入-1,就必须打印出通过分数的平均值和总分数。但它并没有真正起作用。我做错了什么?
var countTotal=0; //variable to store total grades.
var countPassing=0; //variable to store total passing scores.
var x= 0; //variable to contain sum of all passing scores.
var grade=parseInt(prompt("Please enter a grade."));
while (grade != (-1*1))
{
if (grade > 65) {
grade=parseInt(prompt("Please enter a grade."));
document.write(grade + " is passing.<br>");
x=x+grade;
countPassing++;
}
else {
grade=parseInt(prompt("Please enter a grade."));
document.write(grade + " is failing.<br>");
}
countTotal++;
}
//Loop ends
document.write("Total # of grades: " + countTotal); //Prints out total # of passing scores.
document.write("Passing average: " + ((x)/(countPassing))); //Prints out average of all passing scores.
答案 0 :(得分:2)
尝试手工完成。用户进入一年级。然后循环开始。马上,你要求新的成绩,丢弃第一个成绩。如果将提示移动到循环的末尾,它应该可以工作。像这样:
while (grade != (-1*1))
{
if (grade > 65) {
document.write(grade + " is passing.<br>");
x=x+grade;
countPassing++;
}
else {
document.write(grade + " is failing.<br>");
}
grade=parseInt(prompt("Please enter a grade."));
countTotal++;
}