refactoring: format the code by implementing new variables and important comments in displayMenuCalculator.c and displayMenuCalculator.h

src/displayMenuCalculator.c

@@ -1,4 +1,9 @@
 #include "displayMenuCalculator.h"
+
+// Note:
+/* This Function may or may not be implemented in actual program, even if it is merged to the main branch.
+   If it is temporarily not included in the main Program, then this has a role in future Development of the Project */
+
 int check()
 {
     if(a == 1)
@@ -7,18 +12,20 @@ return 1;
     }
 }
 
+
 void displayMenuCalculator(char x)
 {
     if(x == 'c')
     {
         if(check() == 1)
         {
-printf("                                1. Add\n");
-printf("                                2. Subtract\n");
-printf("                                3. Multiply\n");
-printf("                                4. Divide\n");
-printf("                                5. Factorial\n");
+            printf("                                %d. Add\n", operation1);
+            printf("                                %d. Subtract\n", operation2);
+            printf("                                %d. Multiply\n", operation3);
+            printf("                                %d. Divide\n", operation4);
+            printf("                                %d. Factorial\n", operation5);
         }
     }
 }
 
+

src/displayMenuCalculator.h

@@ -3,8 +3,14 @@
 
 #include<stdio.h>
 #include<stdlib.h>
-int check();
-const int a = 1;
+int check(); //int check() is helpful for indirectly testing void displayMenuCalculator()
+const int a = 1; // Variable for indirectly testing void displayMenuCalculator()
 void displayMenuCalculator(char x);
 
+int operation1 = 1;
+int operation2 = 2;
+int operation3 = 3;
+int operation4 = 4;
+int operation5 = 5;
+
 #endif // DISPLAYMENUCALCULATOR_H