set1 of study questions:

------------------------------------------------------------------------

1. you should be able to construct a makefile for 3 C files
that would allow incremental compilation.  

Given that -- how might this makefile be improved?

target: foo
	cc -o foo  a.c b.c c.c

2. given the following program, what does gdb do
about the code in the #ifdef (assume that code is NOT
compiled) 

cc -g -o foo foo.c

main()
{
#ifdef GARP
printf("hi from garp\n");
#else
printf("hi from not garp\n");
#endif
}

In other words, if you use gdb, will it see the #ifdef GARP
is true part of the code?  (try it).  The point is: what happens
when gdb gets to that code.  

3. try something like
% gcc -E foo.c 
(or cc depending on where you are of course)
where foo.c is:

#include <stdio.h>
main()
{
	printf("shijie, ni hao\n"); 
}

What does this do? 

4. what is wrong with this snippet of code (very common bug --
try not do it)

	fprintf("hi world\n");

5. what would the following program snippet do?

	char buf;
	read(0, &buf, 1);
	write(1, &buf, 1);

6. is this buggy or not?

	int x;

	scanf("%d", x);
	printf("%d", x);

If so, what is the problem and how do you fix it?

Answers to the list are ok for any of these. 

questions about assignment 1:
----------------------------