Testing function and header files

misc/my_math_lib/mymath.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int plusone(int nr)
+{
+    return ++nr;
+} 
+

misc/my_math_lib/mymath.h

@@ -0,0 +1,3 @@
+/* Specification of mymath libs */
+
+extern int plusone(int nr);

misc/my_math_lib/test.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include "mymath.h"
+
+int main()
+{
+    printf("Nr: %d\n", plusone(5));
+}