diff --git a/01_ENV/Testat/a.out b/01_ENV/Testat/a.out
new file mode 100755
index 0000000..bf54c6a
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diff --git a/01_ENV/Testat/build-c.sh b/01_ENV/Testat/build-c.sh
new file mode 100755
index 0000000..2cf356d
--- /dev/null
+++ b/01_ENV/Testat/build-c.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+bash clean.sh
+clang-6.0 -c func1.c main.c
+clang-6.0 -s func1.o main.o -lm
diff --git a/01_ENV/Testat/build.sh b/01_ENV/Testat/build.sh
new file mode 100755
index 0000000..eeb81d7
--- /dev/null
+++ b/01_ENV/Testat/build.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# generate main.s, main.o, b.out
+pcc -O0 -S main.c
+as -o main.o main.s
+#ld -o b.out main.o /lib/crt0.o /lib/crti.o  -lc
+pcc -o b.out main.o
+
+# generate a.out
+pcc -O0 -g main.c
+
+# generate assembly intermixed with source code
+objdump -S a.out > objdump-S_a.out.txt
+
diff --git a/01_ENV/Testat/clean.sh b/01_ENV/Testat/clean.sh
new file mode 100755
index 0000000..9469772
--- /dev/null
+++ b/01_ENV/Testat/clean.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+rm *.o *.out
+
diff --git a/01_ENV/Testat/func1.c b/01_ENV/Testat/func1.c
new file mode 100644
index 0000000..a8c7014
--- /dev/null
+++ b/01_ENV/Testat/func1.c
@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+int func1(int x) {
+    return (x-2)*(x-6)*(x-10)*(x-15);
+}
diff --git a/01_ENV/Testat/func1.h b/01_ENV/Testat/func1.h
new file mode 100644
index 0000000..68814f9
--- /dev/null
+++ b/01_ENV/Testat/func1.h
@@ -0,0 +1 @@
+int func1(int x);
diff --git a/01_ENV/Testat/func1.o b/01_ENV/Testat/func1.o
new file mode 100644
index 0000000..913e388
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diff --git a/01_ENV/Testat/main.c b/01_ENV/Testat/main.c
new file mode 100644
index 0000000..d3b7be8
--- /dev/null
+++ b/01_ENV/Testat/main.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+#include "func1.h"
+
+int recursive(int start, int stop);
+
+int main(int argc, char **argv) {
+    
+    int zero = 0;
+    for(int i = 0; i <= 20; ++i) {
+        int tmp = func1(i);
+        printf("Stelle: %d Wert: %d\n", i, tmp);
+        if(tmp == 0) ++zero;
+    }
+    
+    printf("Nullstellen: %d\n", zero);
+    
+    recursive(0, 20);
+    
+}
+
+
+int recursive(int start, int stop) {
+    if(start <= stop) {
+        recursive(start  + 1, stop);
+        printf("Stelle: %d, Wert: %d\n", start, func1(start));
+    }
+    return 0;
+}
diff --git a/01_ENV/Testat/main.o b/01_ENV/Testat/main.o
new file mode 100644
index 0000000..a3d69ce
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