Question

我有这个赋值，允许用户输入有效的输入并使用do while循环显示结果。现在它可以允许用户输入，但不会显示计数器var的结果。任何帮助都会非常感谢

＆＃13;

alert("Sum the Numbers Application");

var sum = 0;
var num = parseInt(prompt("Enter the top numbers to sum", "5"));
for (var i = 1; i <= num; i++) {
  sum += i;
}
if (num <= 0 || num > 100 || isNaN(num)) {
  alert("Not a valid entry.");
} else {
  alert("Sum of the numbers from 1 through " + num + " is " + sum + ".")
}

do {
  var num = parseInt(prompt("Enter the top numbers to sum", "5"));
}
while (num <= 0 || num > 100 || isNaN(num))

＆＃13;

Answer 1

我认为这是理想的。 while循环需要在顶部检查有效响应。输入有效响应后，循环可以退出并计算总和。

＆＃13;

alert("Sum the Numbers Application");

var sum = 0;
var valid = false;
do {
  var num = parseInt(prompt("Enter the top numbers to sum", "5"));
  if (num <= 0 || num > 100 || isNaN(num)) {
    alert("Not a valid entry.");
  } else {
    valid = true;
  }
}
while (!valid)

for (var i = 1; i <= num; i++) {
  sum += i;
}
alert("Sum of the numbers from 1 through " + num + " is " + sum + ".")

＆＃13;

使用do-while循环验证用户输入，然后允许显示有效输入

1 个答案: