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Consider:
<html>
<body>
<input Id="1"></input>
<input Id="2"></input>
<button Id="3"onclick="add()">Add</button>
<script>
function add()
{
var num1 = document.getElementById("1").value;
var val1 = parseInt(num1);
var num2 = document.getElementById("2").value
var val2 = parseInt(num2);
var val3 = val1 + val2;
var x = +num1 + +num2;
alert(val3);
</script>
</body>
</html>
I want to add two numbers in JavaScript. But when I am providing '11111111111111111' to a textbox, parseInt is converting it into 11111111111111112 instead of 11111111111111111. Why is it doing this?
I have tried all techniques. I first converted var to string and parsed it into int then added, used different radix with parseInt, but I still get nothing.
I also noted that when I am providing 16 1's to it, it's working fine, but with 17 1's it's doing this.
523
JavaScript numbers are IEEE 754 doubles which have 15-17 significant digits precision.
In your case the 11111111111111111 number has 17 digits which causes the observed issues.
170
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