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diff --git a/usr.bin/learn/lib/C/L12.1b b/usr.bin/learn/lib/C/L12.1b
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+#print
+The function getnum actually returns -1 when it
+encounters end of file. (The source is in getnum.c
+if you're interested.)
+Write, compile and run a program that
+reads numbers one per line with getnum
+and, for each, prints:
+
+small	if the number is >0 and <=100
+big	if the number is >100 and <=1000
+huge	if the number is >1000.
+
+Type "ready" when you're done.
+#once cp %s/getnum.o .
+#once cp %s/getnum.c .
+#once #create Ref
+1001
+1000
+999
+101
+100
+1
+#once #create Ref1
+huge
+big
+big
+big
+small
+small
+#user
+a.out <Ref >test
+#cmp Ref1 test
+#succeed
+/* One way:*/
+
+main() {
+	int n;
+
+	while ((n = getnum()) >= 0)
+		if (n > 0 && n <= 100)
+			printf("small\n");
+		else if (n > 100 && n <= 1000)
+			printf("big\n");
+		else if (n > 1000)
+			printf("huge\n");
+}
+
+/* 	Notice that in principle n could be negative,
+	so we need the last case to say
+		else if (n > 1000)
+	instead of just falling into it with a bare
+		else
+
+	Also it's a good idea to indent the else-if's
+	exactly the way they are here; otherwise
+	you'll lose track of what's going on.
+**/
+#log
+#next
+13.1a 10