Question about comparing previous price to current price.

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How exactly do you compare for example if the two(or how many ever) previous bars are lower or higher than the current bar? I guess basically what I need to do is compare previous prices with current prices to generate a buy or sell signal.

I thought I could do it this way, but it doesn't seem to work:

close0 = iClose(NULL, 0, 0); //Current
close1 = iClose(NULL, 0, 1); //Previous