矛盾的Javascript变量定义

Question

I am trying to calculate a maths question. It requires the use of variables within variables that loop around.

Here is my JavaScript Code:

var a = m+1;
var b = n+1;
var c = o+1;
var d = p+1;
var e = q+1;
var f = r+1;
var g = s+1;
var h = t+1;
var i = u+1;
var j = v+1;
var l = w+1;

var m = (1+b)/2;
var n = (a+c)/2;
var o = (b+d)/2;
var p = (c+e)/2;
var q = (d+f)/2;
var r = (e+g)/2;
var s = (f+h)/2;
var t = (g+i)/2;
var u = (h+j)/2;
var v = (i+l)/2;
var w = (j+12)/2;

function CalculateA() {
    alert(a);
}

The HTML is just a button calling CalculateA() Function.

This results with undefined. Is there a way to properly calculate this or is it not possible with javascript or coding.

Edit I relize now that this isn't working very well. Also I ran it through excel with looping calculations and found the answer. Thanks for all your help anyway. https://drive.google.com/open?id=0B9I2lCue4HpLZEh3X0NGTUE4YXM The Excel Calculation ^

Answer 1

You could give all variables a start value of zero to prevent NaN and then call the operations again until a is converging to 12.916666666666651 .

 function calc() { a = m + 1; b = n + 1; c = o + 1; d = p + 1; e = q + 1; f = r + 1; g = s + 1; h = t + 1; i = u + 1; j = v + 1; l = w + 1; m = (1 + b) / 2; n = (a + c) / 2; o = (b + d) / 2; p = (c + e) / 2; q = (d + f) / 2; r = (e + g) / 2; s = (f + h) / 2; t = (g + i) / 2; u = (h + j) / 2; v = (i + l) / 2; w = (j + 12) / 2; console.log(a); } var a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0, h = 0, i = 0, j = 0, l = 0, m = 0, n = 0, o = 0, p = 0, q = 0, r = 0, s = 0, t = 0, u = 0, v = 0, w = 0, ii, letter; for (ii = 0; ii < 1000; ii++) { calc(); } for (ii = 1; ii <= 23; ii++) { letter = (ii + 9).toString(36); letter === 'k' || console.log(letter, window[letter]); // k is missing ... } 

 .as-console-wrapper { max-height: 100% !important; top: 0; } 

Answer 2

Nothing is impossible in coding. it is returning undefined because 'a' is declared on top where m is not defined and it is "NaN" error -- Not a Number.

Answer 3

The variables end up depending onto each other, which means that your result will always be NaN.

Javascript tries to give you an exact result for the formula, which it can't. What you need for this math issue, is to replace the variables in each term with each other, to get to a result with only 1 variable - I don't think there's a way for you to do that in Javascript with less effort than doing it manually.