3. Create a sample program (1)

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Program Contents

We will start writing the program within the following basic code. 

  1. int start(){
  2. }

Repeating what has been said before, the command within the bracket (the curly brackets: "{ }") are the action taken each time the tick moves in the market.
Commands written inside the brackets can be broken down into three major types:

  1. A command to take long position
  2. A command to take short position
  3. A command to settle current positions
    （trailing）

1. Command to Take a Long Position

As stated previously, a breakout system takes a long position when the current value exceeds the maximum value of a specific time period, judging the situation as the formation of an upward trend. 
Therefore, the program should take the following steps:

  1. Calculate the maximum value of a set time frame
  2. Compare the current value and the calculated maximum value
  3. Take the long position if the current value is larger than the maximum value.

Calculate the maximum value of a given period

Let's start with step 1: calculate the maximum value of a given period.

  1. double max　=　High[iHighest(NULL, PERIOD_H1, MODE_HIGH, BreakPeriod, 1)];

The above input will yield the maximum value within a given time period set in the variable "BreakPeriod".

The function iHighest() is a function that returns the maximum value over a specific period. 
For example, in the following chart, iHighest() returns the yellow band in a numerical form. 
The Expert Advisor in Meta Trader, by default, prepares an array called High[]. This array contains the maximum value of each yellow bands, and the maximum value of some time period can be determined by the input High[iHighest()].

MetaTraderで表現するブレイクアウト戦略

The explanation may have been slightly convoluted, but it is good enough for practical purposes if you know that "the maximum value of a specific period can be determined, in data type "double", by the input High[iHighest()]. 

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