function for analyzing whether the candle body is at least 30 percent of its height in metatrader 4

mql Get Candle Strength.mq4

//   bool     candleIsStrong = CandleIsStrong(1);

bool CandleIsStrong(int index) {
   bool output = false;
   double totalHeight = High[index] - Low[index];
   double bodyHeight = MathAbs(Open[index] - Close[index]);
   
   if(totalHeight != 0 && bodyHeight != 0) {
      output = ((totalHeight / bodyHeight) > 1.3);
   }
   return output;
}