diff --git a/src/addition.c b/src/addition.c
index d56f705..0bdb599 100644
--- a/src/addition.c
+++ b/src/addition.c
@@ -1,16 +1,16 @@
 #include "addition.h"
 #include <stdlib.h>
 
-void full_adder (unsigned int* sum, unsigned int* nextcarry, unsigned int number1, unsigned int number2, unsigned int carry) {
+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(unsigned int number1, unsigned int number2) {
+unsigned int addition(num number1, num number2) {
     unsigned int result = 0;
-    unsigned int sum[1] = {0};
-    unsigned int nextcarry[1] = {0};
+    num sum[1] = {0};
+    num nextcarry[1] = {0};
 
     for (int i = 0; i < 2; i++)
     {
diff --git a/src/addition.h b/src/addition.h
index ea892ff..a3b2b82 100644
--- a/src/addition.h
+++ b/src/addition.h
@@ -1,8 +1,10 @@
 #ifndef ADDITION_H
 #define ADDITION_H
 
-void full_adder (unsigned int* sum, unsigned int* nextcarry, unsigned int number1, unsigned int number2, unsigned int carry);
+typedef unsigned int num;
 
-unsigned int addition(unsigned int a, unsigned int b);
+void full_adder (num* sum, num* nextcarry, num number1, num number2, num carry);
+
+unsigned int addition(num a, num b);
 
 #endif // ADDITION_H
diff --git a/test/test_addition.c b/test/test_addition.c
index 9b74fe9..36bfa7f 100644
--- a/test/test_addition.c
+++ b/test/test_addition.c
@@ -4,7 +4,7 @@
 
 #include "addition.h"
 
-int carry[1];
+num carry[1];
 
 void setUp(void)
 {
@@ -16,8 +16,8 @@ void tearDown(void)
 
 void test_addition_full_adder_nullplusnullgleichnull(void)
 {
-    unsigned int result[1];
-    unsigned int expected = 0;
+    num result[1];
+    num expected = 0;
 
     full_adder(result, carry, 0, 0, 0);
 
@@ -26,8 +26,8 @@ void test_addition_full_adder_nullplusnullgleichnull(void)
 
 void test_addition_full_adder_nullplusnullgleichnullmituebertrag(void)
 {
-    unsigned int result[1];
-    unsigned int expected = 1;
+    num result[1];
+    num expected = 1;
 
     full_adder(result, carry, 0, 0, 1);
 
@@ -36,8 +36,8 @@ void test_addition_full_adder_nullplusnullgleichnullmituebertrag(void)
 
 void test_addition_full_adder_zahlpluszahlgleichsummeohneuebertrag(void)
 {
-    unsigned int result[5];
-    unsigned int expected[5] = { 0, 1, 1, 1, 1};
+    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);
@@ -54,8 +54,8 @@ void test_addition_full_adder_zahlpluszahlgleichsummeohneuebertrag(void)
 
 void test_addition_full_adder_completesumwithcarry(void)
 {
-    unsigned int result[5], carryresult[5];
-    unsigned int expected[5] = { 0, 0, 1, 1, 0}, expectedcarry[5] = { 1, 1, 1, 0, 0};
+    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);