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22- recorstion2/ex3.c

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+#include "General.h"
+
+#define ASCII_ZERO '0'
+#define ASCII_NINE '9'
+ 
+
+//---------------------------------------------------------------------------------------
+//                                EvenPlaceIsDigit
+//                                ----------------
+//
+// General      : Checks whether all characters in the pairing are digits.
+//
+// Parameters   :  
+//          str - a pointer of string (char *)
+//
+// Return value : If all characters in the pairing are digits.
+//
+//---------------------------------------------------------------------------------------
+// Programmer : Cohen Idan
+// Student No : 211675038
+// Date       : 30.12.2019
+//---------------------------------------------------------------------------------------
+BOOLEAN EvenPlaceIsDigit(char * str)
+{
+    if (!(*str) || !(*(str - ONE)))
+        return (TRUE);
+    else
+        return (EvenPlaceIsDigit(str + TWO) * (ASCII_ZERO <= (*str) && ASCII_NINE >= (*str)));
+}
+
+void main(void)
+{
+
+}