diff --git a/include/devil1geo.h b/include/devil1geo.h
index 00375ad..9755435 100644
--- a/include/devil1geo.h
+++ b/include/devil1geo.h
@@ -73,39 +73,35 @@ struct Mesh {
 #pragma pack(pop)
 
 typedef struct { 
+// input: pointer to struct
     void (* const printheader)    (struct Header*);
+
+// input: pointer to struct
     void (* const printmeshheader)(struct MeshHeader*);
+
+// input: pointer to struct
     void (* const printbatch)     (struct Batch*);
+
+// input: pointer to struct
     void (* const printcoordinate)(struct Coordinate*, unsigned int);
 
+// input: pointer of pointer to struct, order, file data
+// ** = 'pass by reference' of a pointer to struct
     bool (* const getmeshheader)  (struct MeshHeader**, 
                                    unsigned int i, 
                                    const char * const);
 
+// input: pointer to struct, offset of file data batch is at, file data
     bool (* const getbatch)       (struct Batch*, 
                                    unsigned int offset, 
                                    const char * const);
 
+// input: pointer to struct, order, file data
     bool (* const getmesh)        (struct Mesh*, 
                                    unsigned int i, 
-                                   const char* filename);
+                                   const char*);
 } fn_devil1geo;
 extern fn_devil1geo const DEVIL1GEO;
 
-static void printgheader(struct Header*);
-
-static void printmeshheader(struct MeshHeader*);
-
-static void printmeshbatch(struct Batch*);
-
-static void printcoordinate(struct Coordinate*, unsigned int);
-
-// ** = 'pass by reference' of a pointer to struct
-static bool getmeshheader(struct MeshHeader**, unsigned int i, const char * const);
-
-static bool getmeshbatch(struct Batch*, unsigned int offset, const char * const);
-
-static bool getmesh(struct Mesh*, unsigned int i, const char* filename);
-
 #endif
 
diff --git a/src/devil1geo.c b/src/devil1geo.c
index 7bd72c7..4284ba2 100644
--- a/src/devil1geo.c
+++ b/src/devil1geo.c
@@ -1,6 +1,21 @@
 #include "devil1geo.h"
 #include <stdio.h>
 
+static void printgheader(struct Header*);
+
+static void printmeshheader(struct MeshHeader*);
+
+static void printmeshbatch(struct Batch*);
+
+static void printcoordinate(struct Coordinate*, unsigned int);
+
+
+static bool getmeshheader(struct MeshHeader**, unsigned int i, const char * const);
+
+static bool getmeshbatch(struct Batch*, unsigned int offset, const char * const);
+
+static bool getmesh(struct Mesh*, unsigned int i, const char*);
+
 fn_devil1geo const DEVIL1GEO = {printgheader,
                                 printmeshheader,
                                 printmeshbatch,
@@ -11,13 +26,13 @@ fn_devil1geo const DEVIL1GEO = {printgheader,
 
 static void printgheader(struct Header *gh) {
     if (gh != NULL) {
-        printf("pointer %x\n", gh);
+        printf("pointer %p\n", gh);
         printf("number of meshes %x\n", gh -> numMesh);
         printf("unknown number B %x\n", gh -> unknownNumberB);
         printf("unknown number C %x\n", gh -> unknownNumberC);
         printf("unknown number D %x\n", gh -> unknownNumberD);
         printf("padding %x\n", gh -> padding);
-        printf("unknown offset %x\n", gh -> unknownOffset);
+        printf("unknown offset %lx\n", gh -> unknownOffset);
     }
 }
 
@@ -28,8 +43,8 @@ static void printmeshheader(struct MeshHeader *mh) {
     printf("number of batches %x\n", mh -> numBatch);
     printf("number of vertices %x\n", mh -> numVertex);
     printf("unknown %x\n", mh -> u);
-    printf("batch offset %x\n", mh -> offsetBatches);
-    printf("flags %x\n\n", mh -> flags);
+    printf("batch offset %lx\n", mh -> offsetBatches);
+    printf("flags %lx\n\n", mh -> flags);
 }
 
 static void printmeshbatch(struct Batch *b) {
@@ -40,12 +55,12 @@ static void printmeshbatch(struct Batch *b) {
     printf("number of vertices %x\n", bd -> numVertex);
     printf("unknown byte %x\n",       bd -> uB);
     printf("padding %x\n",            bd -> padding);
-    printf("offsetPositions %x\n",    bd -> offsetPositions);
-    printf("offsetNormals %x\n",      bd -> offsetNormals);
-    printf("offsetUVs %x\n",          bd -> offsetUVs);
-    printf("offsetBoneIndexes %x\n",  bd -> offsetBoneIndexes);
-    printf("offsetBoneWeights %x\n",  bd -> offsetBoneWeights);
-    printf("offsets %x\n\n",          bd -> offsets[0]);
+    printf("offsetPositions %lx\n",   bd -> offsetPositions);
+    printf("offsetNormals %lx\n",     bd -> offsetNormals);
+    printf("offsetUVs %lx\n",         bd -> offsetUVs);
+    printf("offsetBoneIndexes %lx\n", bd -> offsetBoneIndexes);
+    printf("offsetBoneWeights %lx\n", bd -> offsetBoneWeights);
+    printf("offsets %lx\n\n",         bd -> offsets[0]);
     printcoordinate(b -> vd.positions, 3);
 }