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+#print
+(Section 1.2)
+The file Ref.c contains a copy of
+a program to convert Fahrenheit to
+Celsius. Modify it to print this
+heading at the top:
+Fahrenheit-Celsius Conversion
+  F:     C:
+Type ready when you're satisfied.
+#once #create Ref
+Fahrenheit-Celsius Conversion
+  F:     C:
+   0  -17.8
+  20   -6.7
+  40    4.4
+  60   15.6
+  80   26.7
+ 100   37.8
+ 120   48.9
+ 140   60.0
+ 160   71.1
+ 180   82.2
+ 200   93.3
+ 220  104.4
+ 240  115.6
+ 260  126.7
+ 280  137.8
+ 300  148.9
+#once #create Ref.c
+/* print Fahrenheit-Celsius table 
+	for f = 0, 20, ..., 300 */
+main()
+{
+	int lower, upper, step;
+	float fahr, celsius;
+
+	lower = 0;	/* lower limit of temperature table */
+	upper = 300;	/* upper limit */
+	step = 20;	/* step size */
+
+	fahr = lower;
+	while (fahr <= upper) {
+		celsius = (5.0/9.0) * (fahr-32.0);
+		printf("%4.0f %6.1f\n", fahr, celsius);
+		fahr = fahr + step;
+	}
+}
+#user
+a.out >x
+#cmp Ref x
+#fail
+Make sure you get the spacing right.
+#log
+#next
+2.1b 10