103 lines
4 KiB
MQL5
103 lines
4 KiB
MQL5
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//+------------------------------------------------------------------+
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//| ArrayDoubleSample.mq5 |
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//| Copyright 2000-2025, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2000-2025, MetaQuotes Ltd."
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#property link "https://www.mql5.com"
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//---
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#include <Arrays\ArrayDouble.mqh>
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#include <Files\FileBin.mqh>
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//---
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const int ExtArraySize=10000;
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const int ExtArrayAdd=100;
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string ExtFileName="ArrayDoubleSample.bin";
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//+------------------------------------------------------------------+
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//| Example class CArrayDouble |
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//+------------------------------------------------------------------+
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int OnStart(void)
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{
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int i,pos;
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double key;
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CFileBin File;
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CArrayDouble ArrayDouble;
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//---
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printf("Start sample %s.",__FILE__);
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//--- fill an array of background information
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//--- open file for reading
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if(File.Open(ExtFileName,FILE_READ)!=INVALID_HANDLE)
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{
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//--- read array from file
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if(!ArrayDouble.Load(File.Handle()))
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{
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//--- error reading from file
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printf("%s (%4d): error %d",__FILE__,__LINE__,GetLastError());
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}
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//--- do not forget close file
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File.Close();
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}
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//--- check whether enough information in the array
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if(ArrayDouble.Total()<ExtArraySize)
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{
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//--- information in the file is not enough, or it is not at all
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//--- reserve position in the array for the missing information
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if(!ArrayDouble.Reserve(ExtArraySize-ArrayDouble.Total()))
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{
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//--- displaying the log error information
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printf("%s (%4d): reserve error",__FILE__,__LINE__);
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//--- remove a previously created array
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return(__LINE__);
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}
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//--- additional fill an array of "random" values
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for(i=ArrayDouble.Total();i<ExtArraySize;i++)
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ArrayDouble.Add(MathRand()*MathPow(10,MathRand()%100));
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}
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//--- sort array
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ArrayDouble.Sort();
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//--- inserts the additional data without violating sorting (ExtArrayAdd items)
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for(i=0;i<ExtArrayAdd;i++)
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ArrayDouble.InsertSort(MathRand()*MathPow(10,MathRand()%100));
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//--- set tolerance "fuzzy" comparison for the search
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ArrayDouble.Delta(0.1);
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//--- produce some of the search in sorted array
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key=MathRand()*MathPow(10,MathRand()%100);
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if((pos=ArrayDouble.SearchGreat(key))==-1)
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printf("Search for items greater than %f, not found",key);
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else
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{
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printf("Search for items greater than %f, found %f in the position %d",key,ArrayDouble.At(pos),pos);
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//--- your actions have found the element
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//--- ...
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//---
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}
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key=MathRand()*MathPow(10,MathRand()%100);
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if((pos=ArrayDouble.SearchLess(key))==-1)
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printf("Search for items less than %f, not found",key);
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else
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{
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printf("Search for items less than %f, found %f in the position %d",key,ArrayDouble.At(pos),pos);
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//--- your actions have found the element
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//--- ...
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//---
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}
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//--- Remove from the array of extra data (ExtArrayAdd/2 largest and ExtArrayAdd/2 lowest)
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ArrayDouble.DeleteRange(ArrayDouble.Total()-ExtArrayAdd/2-1,ArrayDouble.Total());
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ArrayDouble.DeleteRange(0,ExtArraySize/2);
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//--- save the modified array of file
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//--- open file for writing
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if(File.Open(ExtFileName,FILE_WRITE)!=INVALID_HANDLE)
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if(ArrayDouble.Save(File.Handle()))
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{
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//--- normal completion
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//--- because when you call the destructor, an open file is closed automatically
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//--- and explicitly close the file is not necessary but desirable
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printf("End of sample %s. OK!",__FILE__);
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return(0);
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}
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//--- error with file
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//--- displaying the log error information
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printf("%s (%4d): error %d",__FILE__,__LINE__,GetLastError());
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return(__LINE__);
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}
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//+------------------------------------------------------------------+
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