I know im making a rookie mistake but...

[steVENOM]

I know im making a rookie mistake but, everyone has to start somewhere, and I’ve learned how to avoid this issue before but I just cant seem to rememeber how to fix it. Essentially my code in JavaScript is supposed to take input of 2 numbers and then add them together, but it takes the numbers and just lists them together. Again I know this is a common beginner mistake and I’ve done it right before but I cant remember what I’m doing wrong here. I know the variables arent being taken as strings so I’m a bit confused. What do I need to change to make my code take the 2 variables and add them together to display the output as a sum rather than a string of the 2 numbers? The inputs I used in this example of course are storage1 being 10 and storage2 being 10 as well. 

[C2dan88]

User input returned from prompt() is a string. You need to use parseInt() to sum the two numbers together..

[vanished]

Ah the joys of not having strictly typed variables.  It seems convenient and fun until stuff like this happens and causes no end of confusion.

But yeah, the issue is it's treating them like strings.  You'll have to convert to an integer or other number.

[iLostMyXbox21]

try

 

var storageTotal = storage1 + storage2;

alert(“the total equals” + storageTotal);

 

sorry if syntax is wrong, i did something like this a while back, i think that’s how i did it

[minibois]

You are essentially asking the user for text input, so the code interprets this as plain text.

You have to make these either int or float. Float being a number with and int without decimals. You use them like this:

myNumberVar = parseInt(yourVariable);
myNumberVar2 = parseFloat(yourVariable2); 

After doing that piece of code, your can add up your variables.

 

of course once your user enters anything but a number, the system will crash though.

[Adorable Cat]

Yeah, like everyone else has said, you have to use parseInt() to convert those numbers into ints. Right now it's just treating them like strings, like if I did alert("happy " + "birthday);

[steVENOM]

4 minutes ago, Sayori said:

Yeah, like everyone else has said, you have to use parseInt() to convert those numbers into ints. Right now it's just treating them like strings, like if I did alert("happy " + "birthday);

Ooohhh that makes sense! Thank you so much guys! My instructor only taught us Number(“Enter string here”) which I didnt think would work in this situation, please let me know if that would work as well and at all possible how to use number concatination

[minibois]

30 minutes ago, steVENOM said:

Ooohhh that makes sense! Thank you so much guys! My instructor only taught us Number(“Enter string here”) which I didnt think would work in this situation, please let me know if that would work as well and at all possible how to use number concatination

 

Not sure if you are asking how to do concatenation.. But I think you do, so I'm just gonna show you an example. If the user enter the numbers 1 and 6 respectively, for storage1 and storage2, these two programs ways of show the total will do two different things:

//Javascript code

var storage1 = parseInt(prompt("Enter num1"));
var storage2 = parseInt(prompt("Enter num2"));


//This will show 7. 
//The parenthesis around the two variables will make it add them up.
alert("The total is: " + (storage1+storage2));

//This will show 16. 
//The lack of parenthesis means I just want to display these 
//variables without doing anything else with them.
alert("The total is: " + storage1+storage2);

 

[elpiop]

7 hours ago, steVENOM said:

Ooohhh that makes sense! Thank you so much guys! My instructor only taught us Number(“Enter string here”) which I didnt think would work in this situation, please let me know if that would work as well and at all possible how to use number concatination

 

 

Number will attempt to parse the whole input as a number, which may be also float, not just an int. parseInt parses the string for a number up to the first nonnumeric character. For example Number('123x') would return NaN (not a number) while parseInt('123') would return 123. If you're only ever going to input an integer they will return the same value. You could also use unary + to convert a string to an int (or float). For example, +'3'  would return 3.