diff --git a/CMakeLists.txt b/CMakeLists.txt
index ce38bb3..c764f3d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,4 +8,6 @@ SET(CMAKE_BUILD_TYPE Debug)
 set (EXECUTABLE_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/bin)
 set (LIBRARY_OUTPUT_PATH ${EXECUTABLE_OUTPUT_PATH})
 
-add_subdirectory(src/c)
\ No newline at end of file
+add_subdirectory(src/c/a3)
+
+add_executable(a5 src/c/a5/flagtest.c)
\ No newline at end of file
diff --git a/src/c/CMakeLists.txt b/src/c/a3/CMakeLists.txt
similarity index 100%
rename from src/c/CMakeLists.txt
rename to src/c/a3/CMakeLists.txt
diff --git a/src/c/a3.c b/src/c/a3/a3.c
similarity index 100%
rename from src/c/a3.c
rename to src/c/a3/a3.c
diff --git a/src/c/a3.h b/src/c/a3/a3.h
similarity index 100%
rename from src/c/a3.h
rename to src/c/a3/a3.h
diff --git a/src/c/a5/Makefile b/src/c/a5/Makefile
new file mode 100644
index 0000000..74ca55f
--- /dev/null
+++ b/src/c/a5/Makefile
@@ -0,0 +1,20 @@
+# C-Quellcode kompilieren und mit ASM-Modul linken
+flagtest: addsub.o flagtest.o
+	gcc -m32 -o flagtest flagtest.o addsub.o 	# linken
+
+flagtest.o: flagtest.c
+	gcc -m32 -c -o flagtest.o flagtest.c 	# compilieren
+
+# ASM-Modul assemblieren
+addsub.o: addsub.asm
+	nasm -f elf -o addsub.o addsub.asm
+
+# Projekt aufraemen 
+clean:
+	@echo 'Ausgabedateien loeschen'
+	rm -f flagtest *.o *~
+
+
+
+
+
diff --git a/src/c/a5/addsub.asm b/src/c/a5/addsub.asm
new file mode 100644
index 0000000..6ae41f8
--- /dev/null
+++ b/src/c/a5/addsub.asm
@@ -0,0 +1,14 @@
+
+section .text
+
+global _addsub
+
+_addsub:
+    push ebp
+    mov ebp, esp
+
+    mov eax, 0
+
+    mov esp, ebp
+    pop ebp
+    ret
\ No newline at end of file
diff --git a/src/c/a5/flagtest.c b/src/c/a5/flagtest.c
new file mode 100644
index 0000000..1657ff9
--- /dev/null
+++ b/src/c/a5/flagtest.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+extern int addsub(int op1, int op2, char what, unsigned int *flags);
+
+
+int main(int argc, char **argv) {
+    if(argc != 4) {
+        printf("Wrong number of arguments\n");
+        return -1;
+    }
+
+    int op1 = atoi(argv[1]);
+    int op2 = atoi(argv[3]);
+    char what = *argv[2];
+
+    unsigned int * flags = NULL;
+
+    int result = addsub(op1, op2, what, flags);
+
+    printf("%d\n", result);
+
+    return 0;
+}
\ No newline at end of file