diff --git a/src/io.cpp b/src/io.cpp
index 1da65ac..e123476 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -37,4 +37,19 @@ void print_type_size_bytes()
     std::cout << std::setw(16) << "float:" << sizeof(float) << " bytes\n";
     std::cout << std::setw(16) << "double:" << sizeof(double) << " bytes\n";
     std::cout << std::setw(16) << "long double:" << sizeof(long double) << " bytes\n";
+}
+void bubble_sort(int *a)
+{
+    for (size_t i = 0; i < 7; i++)
+    {
+        for (size_t j = 0; j < 7 - 1 - i; j++)
+        {
+            if (a[j] > a[j + 1])
+            {
+                int temp{a[j]};
+                a[j] = a[j + 1];
+                a[j + 1] = temp;
+            }
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/io.h b/src/io.h
index 39c803b..e5ae628 100644
--- a/src/io.h
+++ b/src/io.h
@@ -4,4 +4,5 @@ void add_two_numbers();
 int read_number();
 void write_answer(int x);
 void convert_char_to_ascii();
-void print_type_size_bytes();
\ No newline at end of file
+void print_type_size_bytes();
+void bubble_sort(int *a);
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 40a6f62..da47634 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,12 +1,26 @@
 #include <iostream> // for std::cout
 #include "io.h"
 
+#define ARRAY_SIZE 7
+
 // Definition of function main()
+void bubble_sort_demo()
+{
+    int demo[ARRAY_SIZE]{11, 14, 3, 18, 8, 17, 43};
+    for (int i = 0; i < 7; i++)
+        std::cout << demo[i] << ", ";
+    std::cout << "\n";
+    bubble_sort(demo);
+    for (int i = 0; i < ARRAY_SIZE; i++)
+        std::cout << demo[i] << ", ";
+}
 int main()
 {
     // add_two_numbers();
     // convert_char_to_ascii();
     print_type_size_bytes();
 
+    bubble_sort_demo();
+
     return 0;
-}
\ No newline at end of file
+}