Fix segfault in 1984/laman without an arg

1984/laman/Makefile

@@ -159,8 +159,6 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "NOTE: this entry will likely dump core without an arg and it will not work without"
-	@echo "a positive number."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable

1984/laman/README.md

@@ -10,9 +10,13 @@ Mike Laman
 
 	./laman <positive number>
 
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this entry to not
+segfault if no arg is specified. Instead it'll print nothing. Thank you Cody for
+your assistance!
+
 ## Try:
 
-The program accepts ONE positive argument.  Seeing is believing, so try things
+The program accepts ONE POSITIVE argument.  Seeing is believing, so try things
 like:
 
 	./laman 4
@@ -21,9 +25,6 @@ like:
 
 This code should run you in circles.
 
-NOTE: this program will likely segfault if you do not provide an argument and it
-will not print anything if the number is not positive or not a number.
-
 ## Judges' comments:
 
 Some new compilers dislike lines 6 and 10 of the source, so we changed

1984/laman/laman.c

@@ -1,5 +1,5 @@
 a[900];		b;c;d=1		;e=1;f;		g;h;O;		main(k,
-l)char*		*l;{g=		atoi(*		++l);		for(k=
+l)char*		*l;{g=		l[1]?		atoi(*++l)	:0;for(k=
 0;k*k<		g;b=k		++>>1)		;for(h=		0;h*h<=
 g;++h);		--h;c=(		(h+=g>h		*(h+1))		-1)>>1;
 while(d		<=g){		++O;for		(f=0;f<		O&&d<=g