diff --git a/src/addition.c b/src/addition.c
new file mode 100644
index 0000000..0298801
--- /dev/null
+++ b/src/addition.c
@@ -0,0 +1,29 @@
+#include "addition.h"
+#include <stdlib.h>
+
+void full_adder (num* sum, num* nextcarry, num number1, num number2, num carry) {
+    sum[0] = (number1 % 2) ^ (number2 % 2) ^ (carry % 2);
+    
+    nextcarry[0] = ((number1 % 2) & (number2 % 2)) | ((number1 % 2) & (carry % 2)) | ((number2 % 2) & (carry % 2));
+}
+
+unsigned int addition(num number1, num number2) {
+    unsigned int result = 0;
+    num sum[1] = {0};
+    num nextcarry[1] = {0};
+
+    for (int i = 0; i < 8 * sizeof(num); i++)
+    {
+        full_adder(sum, nextcarry, number1, number2, nextcarry[0]);
+        result ^= (sum[0] << i);
+
+        number1 >>= 1;
+        number2 >>= 1;
+    }
+
+    return result;
+}
+
+float addition_float(float a, float b) {
+    return 0.0;
+}
\ No newline at end of file
diff --git a/src/addition.h b/src/addition.h
new file mode 100644
index 0000000..0898765
--- /dev/null
+++ b/src/addition.h
@@ -0,0 +1,12 @@
+#ifndef ADDITION_H
+#define ADDITION_H
+
+typedef unsigned int num;
+
+void full_adder (num* sum, num* nextcarry, num number1, num number2, num carry);
+
+unsigned int addition(num a, num b);
+
+float addition_float(float a, float b);
+
+#endif // ADDITION_H
diff --git a/test/test_addition.c b/test/test_addition.c
new file mode 100644
index 0000000..40af2ff
--- /dev/null
+++ b/test/test_addition.c
@@ -0,0 +1,136 @@
+#ifdef TEST
+
+#include "unity.h"
+
+#include "addition.h"
+
+num carry[1];
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_addition_full_adder_nullplusnullgleichnull(void)
+{
+    num result[1];
+    num expected = 0;
+
+    full_adder(result, carry, 0, 0, 0);
+
+    TEST_ASSERT_EQUAL_UINT(expected, result[0]);
+}
+
+void test_addition_full_adder_nullplusnullgleichnullmituebertrag(void)
+{
+    num result[1];
+    num expected = 1;
+
+    full_adder(result, carry, 0, 0, 1);
+
+    TEST_ASSERT_EQUAL_UINT(expected, result[0]);
+}
+
+void test_addition_full_adder_zahlpluszahlgleichsummeohneuebertrag(void)
+{
+    num result[5];
+    num expected[5] = { 0, 1, 1, 1, 1};
+
+    full_adder((result+0), carry, 1, 0, 1);
+    full_adder((result+1), carry, 0, 1, 0);
+    full_adder((result+2), carry, 1, 0, 0);
+    full_adder((result+3), carry, 0, 0, 1);
+    full_adder((result+4), carry, 1, 1, 1);
+
+    TEST_ASSERT_EQUAL_UINT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_UINT(expected[1], result[1]);
+    TEST_ASSERT_EQUAL_UINT(expected[2], result[2]);
+    TEST_ASSERT_EQUAL_UINT(expected[3], result[3]);
+    TEST_ASSERT_EQUAL_UINT(expected[4], result[4]);
+}
+
+void test_addition_full_adder_completesumwithcarry(void)
+{
+    num result[5], carryresult[5];
+    num expected[5] = { 0, 0, 1, 1, 0}, expectedcarry[5] = { 1, 1, 1, 0, 0};
+
+    full_adder(result+0, carryresult+0, 0, 1, 1);
+    full_adder(result+1, carryresult+1, 1, 1, 0);
+    full_adder(result+2, carryresult+2, 1, 1, 1);
+    full_adder(result+3, carryresult+3, 0, 1, 0);
+    full_adder(result+4, carryresult+4, 0, 0, 0);
+
+    TEST_ASSERT_EQUAL_UINT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_UINT(expected[1], result[1]);
+    TEST_ASSERT_EQUAL_UINT(expected[2], result[2]);
+    TEST_ASSERT_EQUAL_UINT(expected[3], result[3]);
+    TEST_ASSERT_EQUAL_UINT(expected[4], result[4]);
+    TEST_ASSERT_EQUAL_UINT(expectedcarry[0], carryresult[0]);
+    TEST_ASSERT_EQUAL_UINT(expectedcarry[1], carryresult[1]);
+    TEST_ASSERT_EQUAL_UINT(expectedcarry[2], carryresult[2]);
+    TEST_ASSERT_EQUAL_UINT(expectedcarry[3], carryresult[3]);
+    TEST_ASSERT_EQUAL_UINT(expectedcarry[4], carryresult[4]);
+}
+
+void test_addition_addition_basecasezeropluszeroequalzero(void)
+{
+    unsigned int result;
+    unsigned int expected = 0;
+
+    result = addition(0, 0);
+
+    TEST_ASSERT_EQUAL_UINT(expected, result);
+}
+
+void test_addition_addition_basecaseonescolumns(void)
+{
+    unsigned int result[2];
+    unsigned int expected[2] = { 1, 1 };
+
+    result[0] = addition(1, 0);
+    result[1] = addition(0, 1);
+
+    TEST_ASSERT_EQUAL_UINT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_UINT(expected[1], result[1]);
+}
+
+void test_addition_addition_basecasetotenscolumns(void)
+{
+    unsigned int result[5];
+    unsigned int expected[5] = { 3, 3, 2, 3, 3 };
+
+    result[0] = addition(0, 3);
+    result[1] = addition(1, 2);
+    result[2] = addition(1, 1);
+    result[3] = addition(2, 1);
+    result[4] = addition(3, 0);
+
+    TEST_ASSERT_EQUAL_UINT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_UINT(expected[1], result[1]);
+    TEST_ASSERT_EQUAL_UINT(expected[2], result[2]);
+    TEST_ASSERT_EQUAL_UINT(expected[3], result[3]);
+    TEST_ASSERT_EQUAL_UINT(expected[4], result[4]);
+}
+
+void test_addition_addition_allunsignedinteger(void)
+{
+    unsigned int result[5];
+    unsigned int expected[5] = { 88879736, __UINT32_MAX__, 66558, __UINT32_MAX__, 477905879 };
+
+    result[0] = addition(13456275, 75423461);    
+    result[1] = addition(4294967294, 1);    
+    result[2] = addition(1023, 65535);
+    result[3] = addition(0, 4294967295);
+    result[4] = addition(54321567,423584312);
+
+    TEST_ASSERT_EQUAL_UINT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_UINT(expected[1], result[1]);
+    TEST_ASSERT_EQUAL_UINT(expected[2], result[2]);
+    TEST_ASSERT_EQUAL_UINT(expected[3], result[3]);
+    TEST_ASSERT_EQUAL_UINT(expected[4], result[4]);
+}
+
+#endif // TEST