How to add two strings as if they were numbers?

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I have two strings which contain only numbers:

var num1 = '20',
    num2 = '30.5';

I would have expected that I could add them together, but they are being concatenated instead:

num1 + num2; // = '2030.5'

How can I force these strings to be treated as numbers?

I would use the unary plus operator to convert them to numbers first.

+num1 + +num2;

Adding two numbers concatenates them instead of calculating the , They are actually strings, not numbers. The easiest way to produce a number from a string is to prepend it with + : var x = +y + +z;. If you want to perform operation with numbers as strings (as in the case where numbers are bigger than 64bits can hold) you can use the big-integer library. 1.You can use the unary plus to convert string number into integer.

MDN docs for parseInt MDN docs for parseFloat

In parseInt radix is specified as ten so that we are in base 10. In nonstrict javascript a number prepended with 0 is treated as octal. This would obviously cause problems!

parseInt(num1, 10) + parseInt(num2, 10) //base10
parseFloat(num1) + parseFloat(num2)

Also see ChaosPandion's answer for a useful shortcut using a unary operator. I have set up a fiddle to show the different behaviors.

var ten = '10';
var zero_ten = '010';
var one = '1';
var body = document.getElementsByTagName('body')[0];

Append(parseInt(ten) + parseInt(one));
Append(parseInt(zero_ten) + parseInt(one));
Append(+ten + +one);
Append(+zero_ten + +one);

function Append(text) {

Sum of two large numbers, two numbers with digit replacements · Check if a given string is sum-string We traverse both strings from end, one by one add digits and keep track of carry. + n2) where n1 and n2 are lengths of two input strings representing numbers. '20' - '30' = 10; // returns 10 as a number '20' + '30' = '2030'; // Returns them as a string The values returned from document.getElementById are strings, so it's better to parse them all (even the one that works) to number, before proceeding with the addition or subtraction.

I would recommend to use the unary plus operator, to force an eventual string to be treated as number, inside parenthesis to make the code more readable like the following:


So, in your case it's:

var num1 = '20',
    num2 = '30.5';

var sum = (+num1) + (+num2);

// Just to test it
console.log( sum ); // 50.5

Add Strings, Level up your coding skills and quickly land a job. Given two non-negative integers num1 and num2 represented as string, return the Add Two Numbers. It can be stored either in the string pointed by the first parameter or in the string pointed by the second parameter. Also it is not clear what to do if there will be an overflow. And at last the third question is how the numbers are stored. Whether the least significant digit is the first character in a string or is the last character in a string.

var result = Number(num1) + Number(num2);

How to Add Two Strings Numerically?, You should not use any BigInteger library nor convert the inputs to Tags:add two strings numerically, adding string numbers, algorithm, C++ coding exercise If the pointer is over the length of the string, we simply add ZERO (you can M)) where N and M are the string lengths of both input respectively. Once you have done that, use Integer.parseInt to convert each of the strings to int and then add them. Easy.

convert the strings to floats with parseFloat(string) or to integers with parseInt(string)

Given two strings representing integer numbers, ("123" , "30") return a string representing the sum of the two numbers ("153"). Tags What if the strings are 1000 characters long? does your int tens and int num  Remove minimum number of characters so that two strings become anagram Given two strings in lowercase, the task is to make them anagram . The only allowed operation is to remove a character from any string.

Converting Between Numbers and Strings (The Java™ Tutorials , The Java Tutorials have been written for JDK 8. Frequently, a program ends up with numeric data in a string object—a value entered by the Here is an example, ValueOfDemo , that gets two strings from the command line, converts on the command line if (args.length == 2) { // convert strings to numbers float a = (​Float. I have two types of numbers in one column, one is numeric numbers, the other is a character followed by a number (such as n20, n30, etc). I wish to add up those numbers with an "n". I applied your guidance for "Sum Cells Containing Text And Numbers Based On The Certain Text With Formula", but it did not work.

Use string operators and wildcards in Numbers on Mac, In Numbers on your Mac, learn how to use the string operator in formulas and wildcards in Some examples of the use of the concatenation operator are: SEARCH(“~?”,B2) returns 19 if cell B2 contains “That is a question? Yes it is! The SUM function in Excel allows you to add up the values in a range of cells. However, sometimes you only want to add up the cells that meet certain criteria. That's where the SUMIF function comes in handy, along with the more capable SUMIFS function. There are two common scenarios for using SUMIF:

Handling text, let one = 'Hello, '; let two = 'how are you?'; let joined = one when we try to add (​or concatenate) a string and a number? This method will introduce Kutools for Excel’s Remove Characters utility to remove all non-numeric characters (including letter) and leave numbers only in cells. And then you can sort numbers with text / letter prefix or suffix easily. 1. Copy all numbers with letter prefix or suffix, and then paste beside original numbers with letter prefix or suffix.

  • Very cool. Thanks for sharing this. I found this article which describes the unary plus operator and some of the useful affects it has on different data types.
  • But if those numbers are bigger than 2^53, you'll have to create a function to add parts of the strings and carry the carries over to each part in a loop. :D
  • This gave me an error, so I used parseFloat() instead.
  • See also @NicholasCarey answer below :
  • Is there a less hacky way to do this? (Disclaimer: this is how I've always been doing it.)
  • use parseFloat() if you've got decimals. :)
  • Also you really should specify the radix as 10.
  • And +num1 + +num2 is shorter, arguably more elegant. Basically the unary + operator converts to Number
  • Don't you lose the .5 decimal when you do parseInt?
  • For what it's worth, parseInt & parseFloat are experimental and aren't widely supported across browsers - almost no support on mobile.
  • or (if you only want integer) parseInt(string, 10) see…
  • JavaScript isn't buggy, it uses the same IEEE754 floating point as most everything else. The imprecision you noted is a natural consequence of using binary floating point arithmetic on numbers that you specify and display in decimal.