diff --git a/01_ENV/test.out b/01_ENV/a.out
similarity index 69%
rename from 01_ENV/test.out
rename to 01_ENV/a.out
index da4d0d1..72d69b6 100755
Binary files a/01_ENV/test.out and b/01_ENV/a.out differ
diff --git a/01_ENV/build-c.sh b/01_ENV/build-c.sh
index 7665a29..d48a80e 100755
--- a/01_ENV/build-c.sh
+++ b/01_ENV/build-c.sh
@@ -1,2 +1,3 @@
+bash clean.sh
 clang-6.0 -c func1.c main.c
-clang-6.0 -o test.out -s func1.o main.o
+clang-6.0 -s func1.o main.o
diff --git a/01_ENV/func1.c b/01_ENV/func1.c
index 89d4cf8..29d68a5 100644
--- a/01_ENV/func1.c
+++ b/01_ENV/func1.c
@@ -1,5 +1,18 @@
 #define func1
 
-int func2(int x) {
+int func3(int x) {
     return x + 10;
 }
+
+int func2(int x) {
+    return x - 10;
+}
+
+int recurse1(int count) {  
+    return func1(count - 1);
+}
+
+
+int recurse2(int x) {
+    
+}
diff --git a/01_ENV/func1.h b/01_ENV/func1.h
index ddc106b..3e305c9 100644
--- a/01_ENV/func1.h
+++ b/01_ENV/func1.h
@@ -1 +1,5 @@
+int func3(int x);
 int func2(int x);
+
+int recurse1(int x);
+int recurse2(int x);
diff --git a/01_ENV/func1.o b/01_ENV/func1.o
index 006a2b9..c3f3edf 100644
Binary files a/01_ENV/func1.o and b/01_ENV/func1.o differ
diff --git a/01_ENV/main.c b/01_ENV/main.c
index 64a68a7..4fc4ca5 100644
--- a/01_ENV/main.c
+++ b/01_ENV/main.c
@@ -7,18 +7,37 @@ int global = 8150;
 
 int sum(int,int);
 
-int sum(int a, int b){
+int sum(int a, int b) {
   int result = 451;
   result = a + b;
   return result;
 }
- 
 
-int main(int argc, char **argv)
-{
+int main(int argc, char **argv) {
   int local=4711;
   printf("Hello, world!\nglobal=%d local=%d\n", global, local);
-  printf("Hallo Welt %d\n" ,func2(2));
+  printf("Funktion 1: %d\n" ,func3(2));
+  printf("Funktion 2: %d\n" , func2(2));
+
+  
+  int tmp = 0;
+  for(int i = 0; i <= 5; ++i) {
+      tmp += func3(i);
+  }
+  
+    printf("For: %d\n", tmp);
+  
+  int temp = 0;
+  int j = 0;
+  while(j <= 5) {
+      temp += func3(j);
+      ++j;
+  }
+    printf("While: %d\n", temp);
+  
+  
+  printf("Recurse 1: %d\n", recurse1(2));
+  
   local = sum(global, local);
   return local;
 }
diff --git a/01_ENV/main.o b/01_ENV/main.o
index f5185f2..36ff3a5 100644
Binary files a/01_ENV/main.o and b/01_ENV/main.o differ