So, my code is allowing the user to input 2 numbers, num1 and num2. However the addition function is concatenating the numbers rather than adding them. How can I fix this please?
Here is a snippet of the function:
var sum= num1 + num2;
alert(`Sum of ${num1} and ${num2} is ${sum}`);
The value is of type string. That's why the string concatenation is happening. To perform arithmetic operation, you have to convert the value to number.
Change
var sum= num1 + num2;
To
var sum= Number(num1) + Number(num2);
That is because the even though the input type is number the value is in form of a string, and instead of adding it, it will concating the values.Convert them to number before adding it
var sum = Number(num1) + Number(num2);
alert(`Sum of ${num1} and ${num2} is ${sum}`);
you need to cast strings to numbers, + sign is concatenating strings, here are the examples
var sum= Number(num1) + Number(num2);
alert(`Sum of ${num1} and ${num2} is ${sum}`); // Sum of 1 and 2 is 3
or
var sum= +num1 + +num2;
alert(`Sum of ${num1} and ${num2} is ${sum}`); // Sum of 1 and 2 is 3
You can force it to string and use "" + num1 + num2
var sum = "" + num1 + num2;
alert('Sum of ${num1} and ${num2} is ${sum}');
An other idea is to use parseInt()
const sum = parseInt(num1) + parseInt(num2)
console.log(`Sum of ${num1} and ${num2} is ${sum}`)
here a working code
let num1 = 50
let num2 = "5" //in case of string value the value will be converted by parseInt()
const sum = parseInt(num1) + parseInt(num2)
console.log(`Sum of ${num1} and ${num2} is ${sum}`)