From everything I've been able to find online, JavaScript allegedly uses IEEE 754 doubles for its numbers, but I have found numbers that can work in C doubles, but not in JavaScript. For example,  #include &lt;stdio.h&gt;  int main(){     double x = 131621703842267136.;     printf("%lf\n", x); }   prints 131621703842267136.000000 NOTE: IN AN EARLIER VERSION OF THE QUESTION I COPPIED THE WRONG NUMBER FOR C, but in JavaScript  console.log(131621703842267136)   outputs 131621703842267140. From everything I've read online, both C doubles and JavaScript numbers are 64-bit floating point, so I am very confused why they would output different results. Any ideas?
Consider the following code:   0.1 + 0.2 == 0.3  -&gt;  false   0.1 + 0.2         -&gt;  0.30000000000000004   Why do these inaccuracies happen?
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