diff --git a/.gitignore b/.gitignore
index 6065ccf..254bdcf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,4 +52,6 @@ Module.symvers
 Mkfile.old
 dkms.conf
 
-main
\ No newline at end of file
+main
+
+result.txt
\ No newline at end of file
diff --git a/MMS24_25.c b/MMS24-25.c
similarity index 96%
rename from MMS24_25.c
rename to MMS24-25.c
index 4c339b4..e210532 100644
--- a/MMS24_25.c
+++ b/MMS24-25.c
@@ -11,7 +11,7 @@
  * https://git.beimgraben.net/MMS-2024-25/MMS-Loesung-2024-25.git
  */
 
-#include "MMS24_25.h"
+#include "MMS24-25.h"
 #include "math.h"
 #include <stdio.h>
 #include <stdlib.h>
@@ -31,10 +31,8 @@ double interpolateLine(
         double dXq
     ) {
     double y = (
-        (dY2 - dY1) / (dY2 - dX1)
-    ) * dXq - (
         (dY2 - dY1) / (dX2 - dX1)
-    ) * dX1 + dY1;
+    ) * (dXq + dX1);
 
     #ifdef _DEBUG_
         // DEBUG: print the parameters and result
diff --git a/MMS24_25.h b/MMS24-25.h
similarity index 100%
rename from MMS24_25.h
rename to MMS24-25.h
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5da918e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+CC=gcc
+SOURCE_FILE=MMS24-25.c
+OPTS=-lm
+
+all: testInterpolation
+
+testInterpolation:
+	$(CC) testInterpolation.c $(SOURCE_FILE) -o testInterpolation $(OPTS)
\ No newline at end of file
diff --git a/testInterpolation b/testInterpolation
new file mode 100755
index 0000000..46d1250
Binary files /dev/null and b/testInterpolation differ
diff --git a/testInterpolation.c b/testInterpolation.c
new file mode 100644
index 0000000..5512a41
--- /dev/null
+++ b/testInterpolation.c
@@ -0,0 +1,31 @@
+//
+// Created by frederik on 1/11/25.
+//
+
+#include "MMS24-25.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+
+int main (int iArgC, char** ppcArgV){
+    int iRes = -1;
+
+    if (iArgC != 6){
+        printf("Number of Arguments != 6\n");
+        printf("Usage testInterpolation <dX1> <dY1> <dX2> <dY2> <dX>\n");
+        exit(iRes);
+    };
+
+    double dX1 = atof(ppcArgV[1]);
+    double dY1 = atof(ppcArgV[2]);
+    double dX2 = atof(ppcArgV[3]);
+    double dY2 = atof(ppcArgV[4]);
+    double dX = atof(ppcArgV[5]);
+
+    for(int i=0; i<4; i++){
+        double dRes = interpolateLine(dX1, dY1, dX2, dY2, dX+(double)i);
+        printf ("%f,%f\n",dX+(double)i,dRes);
+    }
+
+    return iRes;
+}