When I put
x+y in the function it is going wrong. For example
- are working. Why is
+ not working? Please help me. Thanks a lot in advance
One or both of the variables is a string instead of a number. This makes the
+ do string concatenation.
'2' + 2 === '22'; // true 2 + 2 === 4; // true
The other arithmetic operators
/ * - will perform a
toNumber conversion on the string(s).
'3' * '5' === 15; // true
A quick way to convert a string to a number is to use the unary
+'2' + 2 === 4; // true
...or with your variables:
+x + +y
+ has two uses. One is addition, the other however is string concatenation. If one or both of your variables is a string, then
+ will concatenate them.
You will need to use
parseFloat to turn a string into a number.
this works every time
((x*1) + (y*1))
If the numbers that you are trying to add are 10 and 12, if they resulting sum is supposed to be 22, then you should probably do it as
+10 + +12
And the result might be a string like 1012 if one or both of the numbers is a string.
Unary plus should work:
var totalVal = (+2) + (+2); alert(totalVal); // result 4
The addition operator works the following way:
1) If at least one operand is a string, then another is converted to string and concatenation is performed;
1 + "2" // "12" "2" + "3" // "23" "2" + null // "2null", null is converted to "null"
2) In other cases both operands are converted to numbers:
1 + null // 2, null is converted to 0 1 + undefined // NaN, undefined is converted to NaN
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