Merge pull request #1 from anic17/patch-1

Added comments + checks + small bug fixes regarding special keypresses

getKey.c

@@ -2,18 +2,34 @@
 #include <stdio.h>
 #include <conio.h>
 
-int main(int argc, char *argv[]) {
-  char c;
-  if (argc > 1) {
-    c = atoi(argv[1]);
-    if (!c && argv[1][0] != '0') {
-      c = argv[1][0];
+int main(int argc, char *argv[])
+{
+    /*
+        Declared as an integer because getch() returns an integer.
+        And initialization to zero is used to avoid potential issues.
+    */
+    int c = 0; 
+    if (argc > 1)
+    {
+        c = atoi(argv[1]);
+        if(c < 0)
+        {
+            c = abs(c); // Make sure we don't input negative values
+        }
+        if (!c && argv[1][0] != '0')
+        {
+            c = argv[1][0];
+        }
+    }
+    else
+    {
+        c = getch();
+        if (!c || c == 0xE0) // Special codes (0x0 and 0xE0 require 2 keypresses)
+        {
+            c += getch() + 255;
+        }
     }
-  } else {
-    c = getch();
-  }
 
-  putchar(c);
-  return c;
+    putchar(c % 256); // Make sure to keep the character range from 0 to 255
+    return c;
 }
-