diff --git a/7-teiler.c b/7-teiler.c
deleted file mode 100644
index f869aac..0000000
--- a/7-teiler.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * lower and upper end as user input
- * use a for loop to output all numbers for which 7|x is true.
- */
-
-#include <stdio.h>
-
-int main() {
-    
-    int a,b;
-    printf("input lower end:\n");
-    fflush(stdin);
-    scanf("%d",&a);
-    printf("input upper end:\n");
-    fflush(stdin);
-    scanf("%d",&b);
-
-    printf("inputs: %d %d\n", a, b);
-    for(int i=a; i<=b; i++){
-	if(i%7==0)
-	    printf("%d ", i);
-	if(i==b)
-	    printf("\n");
-    }
-
-    // reverse array order
-    
-    return 0;
-}
diff --git a/compile-all.sh b/compile-all.sh
index 9392fa4..35b65a2 100755
--- a/compile-all.sh
+++ b/compile-all.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+mkdir -p bin
 returnCode=0
 echo -e "compiling all files in working directory $(pwd)\n"
 for file in $(/bin/ls *.c); 
diff --git a/compile-and-run.sh b/compile-and-run.sh
index e4ec664..d7bd02a 100755
--- a/compile-and-run.sh
+++ b/compile-and-run.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+mkdir -p bin
 noext=$(echo "$1" | cut -f 1 -d '.')
 echo "compiling $1 ..."
 gcc $1 -o bin/$noext -lm
diff --git a/compile.sh b/compile.sh
index cfad674..0405b59 100755
--- a/compile.sh
+++ b/compile.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+mkdir -p bin
 echo "compiling $1 ..."
 noext=$(echo "$1" | cut -f 1 -d '.')
 gcc $1 -o bin/$noext -lm
diff --git a/7teiler.c b/dividableBy7.c
similarity index 100%
rename from 7teiler.c
rename to dividableBy7.c