Update getfloat.c

Added one more condition "&& (c != '.')" to allow the user to type ".1" and let the program assume it is 0.1

Author: sadeem-albir

chapter_5/exercise_5_02/getfloat.c

@@ -46,7 +46,7 @@ int getfloat(float *pn)
   while (isspace(c = getch()))
     ;
 
-  if (!isdigit(c) && c != EOF && c != '+' && c != '-')
+  if (!isdigit(c) && c != EOF && c != '+' && c != '-' && c != '.')
   {
     ungetch(c);
     return 0;