diff --git a/a.out b/a.out
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diff --git a/arithmetic.cpp b/arithmetic.cpp
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index 0000000..4fa3aa2
--- /dev/null
+++ b/arithmetic.cpp
@@ -0,0 +1,6 @@
+#include "arithmetic.h"
+int add(int a, int b)
+{
+	int c = a+b;
+	return c;
+}
diff --git a/arithmetic.h b/arithmetic.h
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--- /dev/null
+++ b/arithmetic.h
@@ -0,0 +1 @@
+int add(int, int);
diff --git a/arithmetic.o b/arithmetic.o
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diff --git a/main.cpp b/main.cpp
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index 0000000..3e3c2e7
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+#include "arithmetic.h"
+
+int main()
+{
+	std::cout<<"Hello world!"<<std::endl;
+	std::cout<<"c: "<<add(1,2)<<std::endl;
+	return 0;
+}
diff --git a/main.o b/main.o
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diff --git a/makefile b/makefile
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+++ b/makefile
@@ -0,0 +1,12 @@
+all: main arithmetic
+	g++ main.o arithmetic.o
+
+main: main.cpp
+	g++ -c main.cpp
+	
+arithmetic: arithmetic.cpp arithmetic.h
+	g++ -c arithmetic.cpp
+	
+clean:
+	rm *.o
+	rm a.out
diff --git a/textfile.md b/textfile.md
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index 0000000..e69de29