Add reverse macro for Fahrenheit/Celsius conversion.

diff --git a/defs.h b/defs.h
index eba91aa7be855c7a95255238ad05ae85df9e560c..ec15c7d99f9181838b8a5823a71d50a04ddd79bc 100644 (file)
--- a/defs.h
+++ b/defs.h
@@ -48,6 +48,7 @@
 #define METERS_TO_MILES(a) ((a) / 1609.344)
 #define FATHOMS_TO_METERS(a) ((a) * 1.8288)
 
+#define CELSIUS_TO_FAHRENHEIT(a) (((a) * 1.8) + 32)
 #define FAHRENHEIT_TO_CELSIUS(a) (((a) - 32) / 1.8)
 
 #define SECONDS_PER_HOUR (60L*60)