Don't bury magic numbers!

02-vars-and-math.c

@@ -1,11 +1,15 @@
 #include <stdio.h>
 
+#define  LOWER  0
+#define  UPPER  300
+#define  STEP   20
+
 /* print Fahrenheit-Celsius table */
 int main()
 {
 	int fahr;
 
 	printf("Fahrenheit\tCelsius\n=======================\n");
-	for (fahr = 0; fahr <= 300; fahr = fahr + 20)
+	for (fahr = UPPER; fahr >= LOWER; fahr = fahr - STEP)
 		printf("%3d\t\t%7.1f\n", fahr, (5.0/9.0)*(fahr-32));
 }

03-celsius-to-fahrenheit.c

@@ -1,11 +1,15 @@
 #include <stdio.h>
 
+#define  LOWER  0
+#define  UPPER  300
+#define  STEP   20
+
 /* print Celsius-Fahrenheit table */
 int main()
 {
 	int cels;
 
 	printf("Celsius\t\tFahrenheit\n==========================\n");
-	for (cels = 0; cels <= 300; cels = cels + 20)
+	for (cels = LOWER; cels <= UPPER; cels = cels + STEP)
 		printf("%3d\t\t%10.0f\n", cels, (9.0/5.0)*cels+32);
 }

README.adoc

@@ -145,3 +145,10 @@ https://github.com/krislamo/knrc/commit/93126a8207ba83e3712bbab7b1e54548761a5fa1
 https://github.com/krislamo/knrc/blob/93126a8207ba83e3712bbab7b1e54548761a5fa1/03-celsius-to-fahrenheit.c[(Source)]
 
 This is a simple little solution for a Celsius to Fahrenheit table.
+
+Exercise 1-5. print the table in reverse order
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+https://github.com/krislamo/knrc/commit/588969b09fabab1e91ff4f4b1c37e87fc23cf76b[(Diff)]
+https://github.com/krislamo/knrc/blob/588969b09fabab1e91ff4f4b1c37e87fc23cf76b/02-vars-and-math.c[(Source)]
+
+Move some numbers around to reverse the table.