diff --git a/01_ENV/a.out b/01_ENV/a.out
index 72d69b6..63075a8 100755
Binary files a/01_ENV/a.out and b/01_ENV/a.out differ
diff --git a/01_ENV/build-c.sh b/01_ENV/build-c.sh
index d48a80e..218240c 100755
--- a/01_ENV/build-c.sh
+++ b/01_ENV/build-c.sh
@@ -1,3 +1,3 @@
 bash clean.sh
-clang-6.0 -c func1.c main.c
+clang-6.0 -c func1.c main.c -lm
 clang-6.0 -s func1.o main.o
diff --git a/01_ENV/func1.c b/01_ENV/func1.c
index 29d68a5..fb45c6a 100644
--- a/01_ENV/func1.c
+++ b/01_ENV/func1.c
@@ -1,6 +1,10 @@
+#include <stdio.h>
+#include <math.h>
+
 #define func1
 
 int func3(int x) {
+    //return pow(x, 3) - 3 * pow(x, 2) - x + 3;
     return x + 10;
 }
 
@@ -8,11 +12,17 @@ int func2(int x) {
     return x - 10;
 }
 
-int recurse1(int count) {  
-    return func1(count - 1);
+int recurse1(int count) {
+    if(count >= 0) {
+         printf("Recurse 1: %d\n", func3(count - 1));
+         return recurse1(count - 1);
+    }else return 0;
 }
 
 
-int recurse2(int x) {
-    
+int recurse2(int count) {
+    if(count >= 0) {
+         printf("Recurse 2: %d\n", func3(count - 1));
+         return recurse1(count - 1);
+    }else return 0;
 }
diff --git a/01_ENV/func1.o b/01_ENV/func1.o
index c3f3edf..3a13b68 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 4fc4ca5..5ed484e 100644
--- a/01_ENV/main.c
+++ b/01_ENV/main.c
@@ -27,16 +27,28 @@ int main(int argc, char **argv) {
   
     printf("For: %d\n", tmp);
   
-  int temp = 0;
+  tmp = 0;
   int j = 0;
   while(j <= 5) {
-      temp += func3(j);
+      tmp += func3(j);
       ++j;
   }
-    printf("While: %d\n", temp);
+  
+  printf("While: %d\n", tmp);
   
   
-  printf("Recurse 1: %d\n", recurse1(2));
+  tmp = 0;
+  int zeroes = 0;
+  for(int i = 0; i <= 5; ++i) {
+      int func = func3(i);
+      tmp += func;
+      if(tmp == 0) zeroes++;
+  }
+  printf("Nullstellen: %d\n", zeroes);
+  
+  
+  recurse1(20);
+  recurse2(20);
   
   local = sum(global, local);
   return local;
diff --git a/01_ENV/main.o b/01_ENV/main.o
index 36ff3a5..03be1ba 100644
Binary files a/01_ENV/main.o and b/01_ENV/main.o differ