Syntax for pow function using inline C

http://www.espruino.com/Compilation is about compiling JS code, not inline C which is http://www.espruino.com/InlineC

http://www.espruino.com/Extending+Esprui­­no+1 is about compiling your own version if Espruino - in which case you can include what you want.

The preprocessor is disabled because:

• it's a potential security hole (#include "/etc/passwd")
  
• including things will almost certainly bring in a lot of extra code and/or memory requirements that will probably use enough RAM that it makes it unusable anyway.
  
  

I guess you're just compiling a pow function for fun? Because there's one already in Math.pow.

If I were doing it, I'd:

• Google c implementation of pow
  
• Copy the code from https://stackoverflow.com/questions/1014­39/the-most-efficient-way-to-implement-a­n-integer-based-power-function-powint-in­t
  

• Paste it into the example from http://www.espruino.com/InlineC

  var c = E.compiledC(`
  // int ipow(int,int)
  int ipow(int base, int exp)
  {
  int result = 1;
  for (;;)
  {
      if (exp & 1)
          result *= base;
      exp >>= 1;
      if (!exp)
          break;
      base *= base;
  }
  
  return result;
  }
  `);
  
  print(c.ipow(5,5));
  

As mentioned in InlineC though, you may have similar issues dealing with double arithmetic though, since the double maths functions won't get built in by default.