Help with For Loop using Double

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for(p=LowestBuy();;p-=0.0001)
This gives me 'unbalanced parenthesis' errors when I try to compile it.  Can you do for loops based on a double data type in MT4?  If so, what am I doing wrong?
 

doubles for loop counter is OK.

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Thanks phy.  So what's wrong?  Can't use a custom function in a for loop?  Incrementing wrong?
 

Who can tell from one line of code. Not me.

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OK, so you're saying that there is nothing at all wrong with the one line I have here?
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Can anybody show me a loop using doubles?
 

for( double i = 1; i < 2; i += 0.01){

Print(i);

}