cFerg/Sum.html

## Sum.html
<!DOCTYPE html>
<html>
<head>
	<script type="text/javascript" src="Sum.js"></script>
</head>
<body>

<table>
    <tr>
    	<th>Minimum Number</th>
        <th>Maximum Number</th>
    </tr>
    <tr>
    	<td><input type="text" id="num1" placeholder="Minimum Number" value="0" oninput="setNum((this.value),(document.getElementById('num2').value));" ></td>
        <td><input type="text" id="num2" placeholder="Maximum Number" value="0" oninput="setNum((document.getElementById('num1').value),(this.value));" ></td>
    </tr>
</table>

<p id="Sum">Please enter a valid integer - To display the sum of the range.</p>
</body>
</html>

## Sum.js
var minNum;
var maxNum;

function setNum(num1,num2){

	//The input is a number
	if ((/^-?[\d.]+(?:e-?\d+)?$/.test(num1) == true)&&(/^-?[\d.]+(?:e-?\d+)?$/.test(num2) == true)){
		//Converts variables to Integer format
		minNum = parseInt(num1);
		maxNum = parseInt(num2);

		//Checks if the variable ordering -> Then rangecheck
		orderCheck();
	}

	//The input isn't a number
	else{
		document.getElementById("Sum").innerHTML = ("Please enter a valid integer - To display the sum of the range.");
	}
}

function orderCheck(){
	var tempMax = maxNum;
	var tempMin = minNum;

	//If numbers are in incorrect order, re-arrange them
	if (minNum > maxNum){
		maxNum = tempMin;
		minNum = tempMax;

		//Recheck
		orderCheck();
	}

	//If numbers are correct order, do a range check
	else{
		sumGet();
	}
}

function sumGet(){

	//If the highest number is positive
	if (maxNum > 0){
		//If the lowest number is positive
		if (minNum > 0){
			//Sets a temporary variable for display
			var preMin = minNum;
			//Subtracts one for proper range count
			minNum = (minNum - 1);
			//Gets the range from (minNum) to (maxNum)
			var highSum = (((+maxNum/2) * (+maxNum - 1)) + +maxNum);
			//Gets the range from zero to (minNum)
			var lowSum = (((+minNum/2) * (+minNum - 1)) + +minNum);
			//Subtracts the difference outside the range
			var sum = (highSum - lowSum)
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from " + +preMin + " -> " + +maxNum + " = " + +sum);
		}
		//If the lowest number is negative
		else if (minNum < 0){
			//Gets the positive range from zero to (maxNum)
			var highSum = (((+maxNum/2) * (+maxNum - 1)) + +maxNum);
			//Gets the negative range from (minNum) to zero
			var lowSum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
			//Adds the sums together
			var sum = (highSum + lowSum)
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from " + +minNum + " -> " + +maxNum + " = " + +sum);
		}
		//If the lowest number is zero
		else if (minNum == 0){
			//Gets the range from zero to (maxNum)
			var sum = (((+maxNum/2) * (+maxNum - 1)) + +maxNum);
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from 0 -> " + +maxNum + " = " + +sum);
		}

	}

	//If the highest number is negative
	else if (maxNum < 0){
		//If the lowest number is positive
		if (minNum > 0){
			//Gets the negative range from (maxNum) to zero
			var highSum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
			//Gets the positive range from zero to (minNum)
			var lowSum = (((+minNum/2) * (+minNum - 1)) + +minNum);
			//Adds the sums together
			var sum = (highSum + lowSum)
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from " + +maxNum + " -> " + +minNum + " = " + +sum);
		}

		//If the lowest number is negative
		if (minNum < 0){
			//Sets a temporary variable for display
			var preMax = maxNum;
			//Adds one for proper range count
			maxNum = (maxNum + 1);
			//Gets the negative range from zero to (maxNum)
			var highSum = (((+maxNum/(0-2)) * (+maxNum + 1)) + +maxNum);
			//Gets the negative range from zero to (minNum)
			var lowSum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
			//Gets the range from (minNum) to (maxNum)
			var sum = (lowSum - highSum);
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from " + +minNum + " -> " + +preMax + " = " + +sum);
		}

		//If the lowest number is zero
		else if (minNum == 0){
			//Gets the negative range from (maxNum) to zero
			var sum = (((+maxNum/(0-2)) * (+maxNum + 1)) + +maxNum);
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from " + +maxNum + " -> 0 = " + +sum);
		}
	}
	//If the highest number is zero
	else if (maxNum == 0){
		//If the lowest number is positive
		if (minNum > 0){
			//Gets the negative range from zero to (minNum)
			var sum = (((+minNum/2) * (+minNum - 1)) + +minNum);
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from 0 -> " + +minNum + " = " + +sum);
		}

		//If the lowest number is negative
		else if (minNum < 0){
			//Gets the negative range from zero to (minNum)
			var sum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from " + +minNum + " -> 0 = " + +sum);
		}

		//If the lowest number is zero
		else if (minNum == 0){
			//Displays the results
			document.getElementById("Sum").innerHTML = ("The sum from 0 -> 0 = 0");
		}
	}
}
	<!DOCTYPE html>
	<html>
	<head>
	<script type="text/javascript" src="Sum.js"></script>
	</head>
	<body>

	<table>
	<tr>
	<th>Minimum Number</th>
	<th>Maximum Number</th>
	</tr>
	<tr>
	<td><input type="text" id="num1" placeholder="Minimum Number" value="0" oninput="setNum((this.value),(document.getElementById('num2').value));" ></td>
	<td><input type="text" id="num2" placeholder="Maximum Number" value="0" oninput="setNum((document.getElementById('num1').value),(this.value));" ></td>
	</tr>
	</table>

	<p id="Sum">Please enter a valid integer - To display the sum of the range.</p>
	</body>
	</html>
	var minNum;
	var maxNum;

	function setNum(num1,num2){

	//The input is a number
	if ((/^-?[\d.]+(?:e-?\d+)?$/.test(num1) == true)&&(/^-?[\d.]+(?:e-?\d+)?$/.test(num2) == true)){
	//Converts variables to Integer format
	minNum = parseInt(num1);
	maxNum = parseInt(num2);

	//Checks if the variable ordering -> Then rangecheck
	orderCheck();
	}

	//The input isn't a number
	else{
	document.getElementById("Sum").innerHTML = ("Please enter a valid integer - To display the sum of the range.");
	}
	}

	function orderCheck(){
	var tempMax = maxNum;
	var tempMin = minNum;

	//If numbers are in incorrect order, re-arrange them
	if (minNum > maxNum){
	maxNum = tempMin;
	minNum = tempMax;

	//Recheck
	orderCheck();
	}

	//If numbers are correct order, do a range check
	else{
	sumGet();
	}
	}

	function sumGet(){

	//If the highest number is positive
	if (maxNum > 0){
	//If the lowest number is positive
	if (minNum > 0){
	//Sets a temporary variable for display
	var preMin = minNum;
	//Subtracts one for proper range count
	minNum = (minNum - 1);
	//Gets the range from (minNum) to (maxNum)
	var highSum = (((+maxNum/2) * (+maxNum - 1)) + +maxNum);
	//Gets the range from zero to (minNum)
	var lowSum = (((+minNum/2) * (+minNum - 1)) + +minNum);
	//Subtracts the difference outside the range
	var sum = (highSum - lowSum)
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from " + +preMin + " -> " + +maxNum + " = " + +sum);
	}
	//If the lowest number is negative
	else if (minNum < 0){
	//Gets the positive range from zero to (maxNum)
	var highSum = (((+maxNum/2) * (+maxNum - 1)) + +maxNum);
	//Gets the negative range from (minNum) to zero
	var lowSum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
	//Adds the sums together
	var sum = (highSum + lowSum)
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from " + +minNum + " -> " + +maxNum + " = " + +sum);
	}
	//If the lowest number is zero
	else if (minNum == 0){
	//Gets the range from zero to (maxNum)
	var sum = (((+maxNum/2) * (+maxNum - 1)) + +maxNum);
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from 0 -> " + +maxNum + " = " + +sum);
	}

	}

	//If the highest number is negative
	else if (maxNum < 0){
	//If the lowest number is positive
	if (minNum > 0){
	//Gets the negative range from (maxNum) to zero
	var highSum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
	//Gets the positive range from zero to (minNum)
	var lowSum = (((+minNum/2) * (+minNum - 1)) + +minNum);
	//Adds the sums together
	var sum = (highSum + lowSum)
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from " + +maxNum + " -> " + +minNum + " = " + +sum);
	}

	//If the lowest number is negative
	if (minNum < 0){
	//Sets a temporary variable for display
	var preMax = maxNum;
	//Adds one for proper range count
	maxNum = (maxNum + 1);
	//Gets the negative range from zero to (maxNum)
	var highSum = (((+maxNum/(0-2)) * (+maxNum + 1)) + +maxNum);
	//Gets the negative range from zero to (minNum)
	var lowSum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
	//Gets the range from (minNum) to (maxNum)
	var sum = (lowSum - highSum);
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from " + +minNum + " -> " + +preMax + " = " + +sum);
	}

	//If the lowest number is zero
	else if (minNum == 0){
	//Gets the negative range from (maxNum) to zero
	var sum = (((+maxNum/(0-2)) * (+maxNum + 1)) + +maxNum);
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from " + +maxNum + " -> 0 = " + +sum);
	}
	}
	//If the highest number is zero
	else if (maxNum == 0){
	//If the lowest number is positive
	if (minNum > 0){
	//Gets the negative range from zero to (minNum)
	var sum = (((+minNum/2) * (+minNum - 1)) + +minNum);
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from 0 -> " + +minNum + " = " + +sum);
	}

	//If the lowest number is negative
	else if (minNum < 0){
	//Gets the negative range from zero to (minNum)
	var sum = (((+minNum/(0-2)) * (+minNum + 1)) + +minNum);
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from " + +minNum + " -> 0 = " + +sum);
	}

	//If the lowest number is zero
	else if (minNum == 0){
	//Displays the results
	document.getElementById("Sum").innerHTML = ("The sum from 0 -> 0 = 0");
	}
	}
	}