StringSetChar - MQL4 Documentation

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string StringSetChar(

string text, int pos, int value)

Returns the string copy with changed character in the specified position.

Parameters:

text	-	String where character will be changed.
pos	-	The character position in the string. Can be from 0 to StringLen(text).
value	-	New char ASCII code.

Sample:

  string str="abcdefgh";
  string str1=StringSetChar(str, 3, 'D');
  // str1 is "abcDefgh"