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MQL4 Reference  String functions  StringGetChar

 
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int StringGetChar( string text, int pos)
Returns character (code) from the specified position in the string.
Parameters:
text   -   String
pos   -   Char position in the string. Can be from 0 to StringLen(text)-1.
Sample:
  int char_code=StringGetChar("abcdefgh", 3);
  // char code 'c' is 99