diff --git a/src/funktion.c b/src/funktion.c
index 34eb7e6..e1c1f3a 100644
--- a/src/funktion.c
+++ b/src/funktion.c
@@ -153,3 +153,9 @@ float Vsubstract2(float x2, float z2) {
     double result = x2 - z2;
     return result;
 }
+float Vsubstract3(float x3, float z3){
+    float X3;
+    X3 = x3 - z3;
+    printf("(%f: \n",X3);
+    return X3;
+}
diff --git a/src/funktion.h b/src/funktion.h
index 28391b8..d13ad49 100644
--- a/src/funktion.h
+++ b/src/funktion.h
@@ -30,5 +30,6 @@ float Vaddx2(float x2, float z2);
 float Vaddx3(float x3, float z3);
 float Vsubstract(float x1, float z1);
 float Vsubstract2(float x2, float z2);
+float Vsubstract3(float x3, float z3);
 
 #endif
diff --git a/src/main.c b/src/main.c
index bdea6d4..9b79fb8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -128,4 +128,10 @@ int main()
     x2 = getValue('X');
     z2 = getValue('z');
     Vsubstract2(x2, z2);
+    
+    printf("z eingeben");
+    x3 = getValue('X');
+    printf("c eingeben");
+    z3 = getValue('z');
+    Vsubstract3(x3, z3);
 }