10 commandments and the NULL pointer?

[Jan Christiaan van Winkel]

>From article <2390 at krafla.rhi.hi.is>, by einari at rhi.hi.is (Einar Indridason):
# int do_something(int *par1, double *par2, char *par3)
# {
# 	/* do something with those pointers/parameters */
# 	/* return some value to tell how well we did */
# }
# 
# 
# main()
# {
# 	.....
# 
# 	x = do_something(NULL, NULL, NULL);
# 	/* is            ^^^^  ^^^^  ^^^^  this right or should I write: */
# 
# 	x = do_something( (int *)NULL, (double *)NULL, (char *)NULL );
# }
since you used prototypes, you can just as well use
 	x = do_something(0, 0, 0);
because the compiler knows the 0's are used in pointer context; it will
automagically cast the value to the right type. Read the FAQ for more
info on the NULL pointer, there's actually quite a lot to be told about
it.
JC

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