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3/ex2_7.c

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+#include <stdio.h>
+#define ONE 1
+#define TWO 2
+//---------------------------------------------------------------------------------------
+//                                              Exercise 2_7
+//                                              ------------
+//
+// General : The program change letters by one depends on situation.
+//
+// Input   : 2 letters.
+//
+// Process : The program checks if the first letter is before the second in
+//           the ABC and acts accordingly.
+//
+// Output  : '1' if is it True, '0' is false.
+//
+//---------------------------------------------------------------------------------------
+// Programmer : Cohen Idan
+// Student No : None
+// Date       : 19.09.2019
+//---------------------------------------------------------------------------------------
+void main(void)
+{
+    char a,
+         b,
+         final_a,
+         final_b,
+         opr = '+';
+    
+    printf("Enter 2 chars: ");
+    scanf("%c%c", &a, &b);
+
+    final_a = a + ONE;
+    final_b = b - ONE;
+
+    if (a > b)
+    {
+        final_a -= TWO;
+        final_b += TWO;
+        opr = '-';
+    }
+
+    printf("%c %c %c\n", final_a, opr, final_b);
+}