diff --git a/feladat3/UnitTest1/UnitTest1.cpp b/feladat3/UnitTest1/UnitTest1.cpp
index ddb15a0..8dfb1d7 100644
--- a/feladat3/UnitTest1/UnitTest1.cpp
+++ b/feladat3/UnitTest1/UnitTest1.cpp
@@ -1,4 +1,4 @@
-// IFPQYY | Tóth Dániel Mátyás | V1
+// IFPQYY | Tóth Dániel Mátyás | V2
 #include "pch.h"
 #include "CppUnitTest.h"
 #include "feladat3.h"
diff --git a/feladat3/UnitTest1/dataset/testin10000.dat.srt b/feladat3/UnitTest1/dataset/testin10000.dat.srt
index 23c050e..7d01a70 100644
Binary files a/feladat3/UnitTest1/dataset/testin10000.dat.srt and b/feladat3/UnitTest1/dataset/testin10000.dat.srt differ
diff --git a/feladat3/UnitTest1/feladat3.cpp b/feladat3/UnitTest1/feladat3.cpp
new file mode 100644
index 0000000..f727140
--- /dev/null
+++ b/feladat3/UnitTest1/feladat3.cpp
@@ -0,0 +1,265 @@
+// IFPQYY | Tóth Dániel Mátyás | V2
+#include <iostream>
+#include <fstream>
+#include <filesystem>
+#include "feladat3.h"
+using namespace std;
+
+static int CopyStr(char* dest, const char* src, const char* concat = "\0");
+static void BubbleSort(unsigned char* arr, int len);
+
+int GetFilenames(int argc, char* argv[],
+		char infilenames[MYMAXFILES][MYMAXFN], 
+		char outfilenames[MYMAXFILES][MYMAXFN]) {
+	if (argc != 2 || argv == nullptr || infilenames == nullptr 
+		|| outfilenames == nullptr) {
+		return NOK;
+	}
+
+	if (argv[1] == nullptr)
+	{
+		return NOK;
+	}
+	cout << "Parameter allomany:\n" << argv[1] << '\n';
+	ifstream argifs(argv[1]);
+	if (!argifs.is_open())
+	{
+		cout << "Nem lehet megnyitni a " << argv[1] << " nevu allomanyt\n";
+		return NOK;
+	}
+	int readAmount = 0;
+	int i = 0;
+	char buf[MYMAXFN-1];
+	cout << "Feldolgozando allomanyok:\n";
+	while (readAmount < 5 && argifs.getline(buf, MYMAXFN-1))
+	{
+		readAmount++;
+		ifstream inputfile(buf);
+		if (!inputfile.fail())
+		{
+			CopyStr(infilenames[i], buf);
+			CopyStr(outfilenames[i], buf, ".srt");
+			cout << infilenames[i] << " " << outfilenames[i] << "\tOK\n";
+			i++;
+		}
+		else
+		{
+			cout << "<" << buf << ">" << "\tNOK\n";
+		}
+	}
+	argifs.close();
+	int status = OK;
+	if (i == 0)
+	{
+		status = NOK;
+		cout << "Ures\tNOK\n";
+	}
+	while (i < 5) {
+		infilenames[i][0] = '\0';
+		outfilenames[i][0] = '\0';
+		i++;
+	}
+	cout << "*DONE\n";
+	return status;
+}
+
+static int CopyStr(char* dest, const char* src, const char* concat) {
+	if (dest == nullptr || src == nullptr) {
+		return NOK;
+	}
+	int i = 0;
+	while (src[i] != '\0')
+	{
+		dest[i++] = src[i];
+	}
+	int j = 0;
+	while (concat[j] != '\0')
+	{
+		dest[i++] = concat[j++];
+	}
+	dest[i] = '\0';
+	return OK;
+}
+
+int SortFile(char* infn, char* outfn, unsigned char* buf,
+		unsigned short* pmin, unsigned short* pmax,
+		unsigned short* pavg, unsigned short* pn,
+		unsigned short bufsize, bool test) {
+	if (infn == nullptr || outfn == nullptr 
+		|| buf == nullptr || pmin == nullptr 
+		|| pmax == nullptr || pavg == nullptr 
+		|| pn == nullptr) // there has to be a better way than this
+	{
+		return NOK;
+	}
+	if (bufsize != MYBUFSIZE) // I guess?
+	{
+		return NOK;
+	}
+
+	ifstream readifs(infn, ios_base::binary);
+	ofstream outofs(outfn, ios_base::binary);
+	if (!readifs.is_open() || outofs.bad())
+	{
+		return NOK;
+	}
+	char filenames[16][30];
+
+	*pmin = MYMAXVALUE;
+	*pmax = 0;
+	*pavg = 0;
+	*pn = filesystem::file_size(infn)/2; // this can't be more than MYMAXVALUE anyways, so warning dully ignored
+
+	if (test)
+	{
+		cout << "\nSTART: " << infn << " ----> " << outfn << "\n";
+		cout << "*READ\n";
+	}
+	long long sum = 0;
+	unsigned short n;
+	int i = 0;
+	int j = 0;
+	int usedfilescnt = 0;
+	char filename[15];
+	while (readifs.read((char*)&n, sizeof(n))) {
+		if (*pmax < n) {
+			*pmax = n;
+		}
+		if (*pmin > n) {
+			*pmin = n;
+		}
+		sum += n;
+		buf[(i * 2) % (MYBUFSIZE)] = n;
+		buf[((i * 2)+1) % (MYBUFSIZE)] = n >> 8;
+		if (test)
+		{
+			cout << i << ".\t" << n << "\n";
+		}
+		i++;
+		if (i % (MYBUFSIZE / 2) == 0)
+		{
+			BubbleSort(buf, MYBUFSIZE);
+			sprintf_s(filename, "filename%d.dat", usedfilescnt);
+			CopyStr(filenames[usedfilescnt], filename);
+			ofstream tempoutofs(filename, ios_base::binary);
+			while (j < MYBUFSIZE/2)
+			{
+				unsigned short insert = (unsigned char)buf[j * 2] + (unsigned char)buf[(j * 2) + 1] * 256;
+				tempoutofs.write((char*)&insert, sizeof(insert));
+				j++;
+			}
+			tempoutofs.close();
+			usedfilescnt++;
+			j=0;
+		}
+	}
+	readifs.close();
+
+	int size = (*pn * 2) % MYBUFSIZE;
+	if (size > 0)
+	{
+		BubbleSort(buf, size);
+		sprintf_s(filename, "filename%d.dat", usedfilescnt);
+		CopyStr(filenames[usedfilescnt], filename);
+		ofstream tempoutofs(filename, ios_base::binary);
+		while (j < size / 2)
+		{
+			unsigned short insert = buf[j * 2] + buf[(j * 2) + 1] * 256;
+			tempoutofs.write((char*)&insert, sizeof(insert));
+			j++;
+		}
+		tempoutofs.close();
+		usedfilescnt++;
+	}
+	else
+	{
+		return NOK;
+	}
+
+	if (test)
+	{
+		cout << "\n*SORT, WRITE\n";
+	}
+
+	i = 0;
+	ifstream streams[16];
+	for (j = 0; j < usedfilescnt; j++)
+	{
+		streams[j].open(filenames[j], ios_base::binary);
+		unsigned short num;
+		streams[j].read((char*)&num, sizeof(num));
+		buf[j * 2] = num;
+		buf[(j * 2) + 1] = num >> 8;
+	}
+	bool doneFile[16] = {false};
+	while (i < *pn)
+	{
+		int savedJ = 0;
+		unsigned short smallest = MYMAXVALUE;
+		for (size_t j = 0; j < usedfilescnt; j++)
+		{
+			if (doneFile[j])
+			{
+				continue;
+			}
+			int currentnum = buf[j*2] + buf[j*2 + 1] * 256;
+			if (currentnum < smallest)
+			{
+				smallest = currentnum;
+				savedJ = j;
+			}
+		}
+		if (test)
+		{
+			cout << i << ".\t" << smallest << "\n";
+		}
+		outofs.write((char *)&smallest, sizeof(smallest));
+		ifstream tempinifs(filenames[savedJ], ios_base::binary);
+		unsigned short num;
+		if (streams[savedJ].read((char*)&num, sizeof(num)))
+		{
+			buf[savedJ * 2] = num;
+			buf[savedJ * 2 + 1] = num >> 8;
+		}
+		else
+		{
+			doneFile[savedJ] = true;
+		}
+		i++;
+	}
+
+	for (i = 0; i < usedfilescnt; i++)
+	{
+		streams[i].close();
+	}
+
+	*pavg = sum / *pn;
+
+	if (test)
+	{
+		cout << "\n*DONE\n";
+		cout << "átlag:\t" << *pavg << "\tmin:\t" << *pmin << "\tmax:\t" << *pmax;
+	}
+	return OK;
+}
+
+static void BubbleSort(unsigned char* arr, int len) { //note: this is a char*. you need to sort unsigned short*. kill 7 billion people
+	for (int i = 0; i < len / 2; i++)
+	{
+		for (int j = 0; j < (len / 2) - i - 1; j++)
+		{
+			unsigned short first = (unsigned char)arr[j * 2] + (unsigned char)arr[j * 2 + 1] * 256;
+			unsigned short second = (unsigned char)arr[(j + 1) * 2] + (unsigned char)arr[(j + 1) * 2 + 1] * 256;
+			if (first > second)
+			{
+				unsigned char temp = arr[j * 2];
+				arr[j * 2] = arr[(j + 1) * 2];
+				arr[(j + 1) * 2] = temp;
+
+				temp = arr[j * 2 + 1];
+				arr[j * 2 + 1] = arr[(j + 1) * 2 + 1];
+				arr[(j + 1) * 2 + 1] = temp;
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/feladat3/UnitTest1/feladat3.h b/feladat3/UnitTest1/feladat3.h
new file mode 100644
index 0000000..9953de6
--- /dev/null
+++ b/feladat3/UnitTest1/feladat3.h
@@ -0,0 +1,15 @@
+// IFPQYY | Tóth Dániel Mátyás | V2
+#pragma once
+#define MYBUFSIZE	8192
+#define MYMAXVALUE	65535
+#define MYMAXFILES	5
+#define MYMAXFN		128
+#define OK			0
+#define NOK			(-1)
+int GetFilenames(int argc, char* argv[], 
+	char infilenames[MYMAXFILES][MYMAXFN], 
+	char outfilenames[MYMAXFILES][MYMAXFN]);
+int SortFile(char* infn, char* outfn, unsigned char* buf,
+	unsigned short* pmin, unsigned short* pmax,
+	unsigned short* pavg, unsigned short* pn,
+	unsigned short bufsize = MYBUFSIZE, bool test = false);
diff --git a/feladat3/UnitTest1/main.cpp b/feladat3/UnitTest1/main.cpp
new file mode 100644
index 0000000..ae914d4
--- /dev/null
+++ b/feladat3/UnitTest1/main.cpp
@@ -0,0 +1,27 @@
+// IFPQYY | Tóth Dániel Mátyás | V2
+#include "feladat3.h"
+#include <iostream>
+using namespace std;
+
+int main(int argc, char* argv[]) {
+	char infn[MYMAXFILES][MYMAXFN];
+	char outfn[MYMAXFILES][MYMAXFN];
+	static unsigned char buf[MYBUFSIZE];
+	unsigned short minv, maxv, avgv, nv;
+	if (GetFilenames(argc, argv, infn, outfn) == NOK)
+	{
+		return(NOK);
+	}
+	for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+	{
+		if (SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true) == NOK)
+			return(NOK);
+	}
+	/*cout << argc;
+	for (size_t i = 0; i < argc; i++)
+	{
+		cout << '\n';
+		cout << argv[i];
+	}*/
+	return(OK);
+}
\ No newline at end of file
diff --git a/feladat3/feladat3/dataset/testin10000.dat.srt b/feladat3/feladat3/dataset/testin10000.dat.srt
index e69de29..7d01a70 100644
Binary files a/feladat3/feladat3/dataset/testin10000.dat.srt and b/feladat3/feladat3/dataset/testin10000.dat.srt differ
diff --git a/feladat3/feladat3/dataset/testin5.dat b/feladat3/feladat3/dataset/testin5.dat
index 0bea184..843dfc7 100644
--- a/feladat3/feladat3/dataset/testin5.dat
+++ b/feladat3/feladat3/dataset/testin5.dat
@@ -1 +1 @@
-”kÜ~:#q/#
\ No newline at end of file
+ÿÿÜ~:#q/#
\ No newline at end of file
diff --git a/feladat3/feladat3/dataset/testin5.dat.srt b/feladat3/feladat3/dataset/testin5.dat.srt
index bf81402..dd04f41 100644
--- a/feladat3/feladat3/dataset/testin5.dat.srt
+++ b/feladat3/feladat3/dataset/testin5.dat.srt
@@ -1 +1 @@
-#:#q/”kÜ~
\ No newline at end of file
+#:#q/Ü~ÿÿ
\ No newline at end of file
diff --git a/feladat3/feladat3/datasets.txt b/feladat3/feladat3/datasets.txt
index 04f5636..2f2bc81 100644
--- a/feladat3/feladat3/datasets.txt
+++ b/feladat3/feladat3/datasets.txt
@@ -1,7 +1,6 @@
 
 
 
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\feladat3\dataset\testin5.dat
 
-C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10000.dat
-
-C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin5.dat
\ No newline at end of file
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\feladat3\dataset\testin10000.dat
diff --git a/feladat3/feladat3/feladat3.cpp b/feladat3/feladat3/feladat3.cpp
index b837e5c..f727140 100644
--- a/feladat3/feladat3/feladat3.cpp
+++ b/feladat3/feladat3/feladat3.cpp
@@ -1,4 +1,4 @@
-// IFPQYY | Tóth Dániel Mátyás | V1
+// IFPQYY | Tóth Dániel Mátyás | V2
 #include <iostream>
 #include <fstream>
 #include <filesystem>
@@ -16,6 +16,10 @@ int GetFilenames(int argc, char* argv[],
 		return NOK;
 	}
 
+	if (argv[1] == nullptr)
+	{
+		return NOK;
+	}
 	cout << "Parameter allomany:\n" << argv[1] << '\n';
 	ifstream argifs(argv[1]);
 	if (!argifs.is_open())
@@ -111,7 +115,7 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 		cout << "\nSTART: " << infn << " ----> " << outfn << "\n";
 		cout << "*READ\n";
 	}
-
+	long long sum = 0;
 	unsigned short n;
 	int i = 0;
 	int j = 0;
@@ -124,7 +128,7 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 		if (*pmin > n) {
 			*pmin = n;
 		}
-		*pavg += n;
+		sum += n;
 		buf[(i * 2) % (MYBUFSIZE)] = n;
 		buf[((i * 2)+1) % (MYBUFSIZE)] = n >> 8;
 		if (test)
@@ -140,9 +144,9 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 			ofstream tempoutofs(filename, ios_base::binary);
 			while (j < MYBUFSIZE/2)
 			{
-				unsigned short insert = buf[j * 2] + buf[(j * 2) + 1] * 256;
+				unsigned short insert = (unsigned char)buf[j * 2] + (unsigned char)buf[(j * 2) + 1] * 256;
 				tempoutofs.write((char*)&insert, sizeof(insert));
-				j+=2;
+				j++;
 			}
 			tempoutofs.close();
 			usedfilescnt++;
@@ -152,18 +156,25 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 	readifs.close();
 
 	int size = (*pn * 2) % MYBUFSIZE;
-	BubbleSort(buf, size);
-	sprintf_s(filename, "filename%d.dat", usedfilescnt);
-	CopyStr(filenames[usedfilescnt], filename);
-	ofstream tempoutofs(filename, ios_base::binary);
-	while (j < size / 2)
+	if (size > 0)
 	{
-		unsigned short insert = buf[j * 2] + buf[(j * 2) + 1] * 256;
-		tempoutofs.write((char*)&insert, sizeof(insert));
-		j++;
+		BubbleSort(buf, size);
+		sprintf_s(filename, "filename%d.dat", usedfilescnt);
+		CopyStr(filenames[usedfilescnt], filename);
+		ofstream tempoutofs(filename, ios_base::binary);
+		while (j < size / 2)
+		{
+			unsigned short insert = buf[j * 2] + buf[(j * 2) + 1] * 256;
+			tempoutofs.write((char*)&insert, sizeof(insert));
+			j++;
+		}
+		tempoutofs.close();
+		usedfilescnt++;
+	}
+	else
+	{
+		return NOK;
 	}
-	tempoutofs.close();
-	usedfilescnt++;
 
 	if (test)
 	{
@@ -171,31 +182,31 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 	}
 
 	i = 0;
-	ifstream* streams = new ifstream[16];
-	for (j = 0; j < usedfilescnt*2; j+=2)
+	ifstream streams[16];
+	for (j = 0; j < usedfilescnt; j++)
 	{
-		streams[j].open(filenames[j / 2], ios_base::binary);
+		streams[j].open(filenames[j], ios_base::binary);
 		unsigned short num;
 		streams[j].read((char*)&num, sizeof(num));
-		buf[j] = num;
-		buf[j+1] = num >> 8;
+		buf[j * 2] = num;
+		buf[(j * 2) + 1] = num >> 8;
 	}
 	bool doneFile[16] = {false};
 	while (i < *pn)
 	{
 		int savedJ = 0;
 		unsigned short smallest = MYMAXVALUE;
-		for (size_t j = 0; j < usedfilescnt*2; j+=2)
+		for (size_t j = 0; j < usedfilescnt; j++)
 		{
 			if (doneFile[j])
 			{
 				continue;
 			}
-			int currentnum = buf[j] + buf[j + 1] * 256;
+			int currentnum = buf[j*2] + buf[j*2 + 1] * 256;
 			if (currentnum < smallest)
 			{
 				smallest = currentnum;
-				savedJ = j/2;
+				savedJ = j;
 			}
 		}
 		if (test)
@@ -206,21 +217,28 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 		ifstream tempinifs(filenames[savedJ], ios_base::binary);
 		unsigned short num;
 		if (streams[savedJ].read((char*)&num, sizeof(num)))
+		{
+			buf[savedJ * 2] = num;
+			buf[savedJ * 2 + 1] = num >> 8;
+		}
+		else
 		{
 			doneFile[savedJ] = true;
 		}
-		buf[savedJ] = num;
-		buf[savedJ + 1] = num >> 8;
-		int debugnum = buf[savedJ] + buf[savedJ] * 256;
 		i++;
 	}
 
+	for (i = 0; i < usedfilescnt; i++)
+	{
+		streams[i].close();
+	}
 
-	*pavg = *pavg / *pn;
+	*pavg = sum / *pn;
 
 	if (test)
 	{
 		cout << "\n*DONE\n";
+		cout << "átlag:\t" << *pavg << "\tmin:\t" << *pmin << "\tmax:\t" << *pmax;
 	}
 	return OK;
 }
@@ -230,8 +248,8 @@ static void BubbleSort(unsigned char* arr, int len) { //note: this is a char*. y
 	{
 		for (int j = 0; j < (len / 2) - i - 1; j++)
 		{
-			unsigned short first = arr[j * 2] + arr[j * 2 + 1] * 256;
-			unsigned short second = arr[(j + 1) * 2] + arr[(j + 1) * 2 + 1] * 256;
+			unsigned short first = (unsigned char)arr[j * 2] + (unsigned char)arr[j * 2 + 1] * 256;
+			unsigned short second = (unsigned char)arr[(j + 1) * 2] + (unsigned char)arr[(j + 1) * 2 + 1] * 256;
 			if (first > second)
 			{
 				unsigned char temp = arr[j * 2];
diff --git a/feladat3/feladat3/feladat3.h b/feladat3/feladat3/feladat3.h
index 97f28e5..9953de6 100644
--- a/feladat3/feladat3/feladat3.h
+++ b/feladat3/feladat3/feladat3.h
@@ -1,4 +1,4 @@
-// IFPQYY | Tóth Dániel Mátyás | V1
+// IFPQYY | Tóth Dániel Mátyás | V2
 #pragma once
 #define MYBUFSIZE	8192
 #define MYMAXVALUE	65535
diff --git a/feladat3/feladat3/filename0.dat b/feladat3/feladat3/filename0.dat
index 730c646..dd04f41 100644
Binary files a/feladat3/feladat3/filename0.dat and b/feladat3/feladat3/filename0.dat differ
diff --git a/feladat3/feladat3/filename1.dat b/feladat3/feladat3/filename1.dat
index 43650e7..926388b 100644
Binary files a/feladat3/feladat3/filename1.dat and b/feladat3/feladat3/filename1.dat differ
diff --git a/feladat3/feladat3/main.cpp b/feladat3/feladat3/main.cpp
index 7e388de..ae914d4 100644
--- a/feladat3/feladat3/main.cpp
+++ b/feladat3/feladat3/main.cpp
@@ -1,4 +1,4 @@
-// IFPQYY | Tóth Dániel Mátyás | V1
+// IFPQYY | Tóth Dániel Mátyás | V2
 #include "feladat3.h"
 #include <iostream>
 using namespace std;