C: complex numbers + sum of multiples

c/grade-school/src/grade_school.c

@@ -2,8 +2,13 @@
 #include <string.h>
 #include <stdio.h>
 
-#define STD(i) roster.students[i]
-#define NAME(i) roster.students[i].name
+/* V1: initial version
+ * V2: removed useless static struct (was planned for a static list
+ *     of grades students, that I will not do).
+ */
+
+#define STD(i)   roster.students[i]
+#define NAME(i)  roster.students[i].name
 #define GRADE(i) roster.students[i].grade
 
 static roster_t roster;
@@ -39,7 +44,7 @@ int add_student(char *s, uint8_t g)
  */
 roster_t get_grade(uint8_t g)
 {
-    static roster_t r;
+    roster_t r;
     unsigned i, j=0;
 
     for (i=0; i<roster.count && GRADE(i)<=g; ++i) {