Plus operator in JavaScript doesn't sum my values

Question

I\'m trying to calculate the number of payments but output was wrong so i tried to calculate a simple operation on the month value.But \"+\" operator doesn\'t sum my values it a

Answer 1

The actual type of the value is string. That's why string concatenation is happening. You have to use parseInt to convert string to integer to perform intended arithmetic operation.

Change:

var months=(principal)+(interestrate);

To:

var months = parseInt(principal) + parseInt(interestrate);

Answer 2

The values you are summing are strings. You need to convert them to integers:

parseInt(principal)+parseInt(interestate)

The reason for this is that input values are always strings. AFAIK, this is even if you set the type to number. parseInt(s) converts a string s to an int.

Answer 3

var months=parseInt(principal)+parseInt(interestrate);

Values need to be converted to an integer first.

Answer 4

Your input values are treated as string as they are textbox inputs. Parse the values first before adding them up.

e.g.

var principal = parseInt(princ.value); var interestrate = parseInt(interest.value);