Exercises

5.1	Implement setbuf using setvbuf.
5.2	Type in the program that copies a file using line-at-a-time I/O (fgets and fputs) from Section 5.8, but use a MAXLINE of 4. What happens if you copy lines that exceed this length? Explain what is happening.
5.3	What does a return value of 0 from printf mean?
5.4	The following code works correctly on some machines, but not on others. What could be the problem? #include <stdio.h> int main(void) { char c; while ((c = getchar()) != EOF) putchar(c); }
5.5	Why does tempnam restrict the prefix to five characters?
5.6	How would you use the fsync function (Section 3.13) with a standard I/O stream?
5.7	In the programs in Figures 1.7 and 1.10, the prompt that is printed does not contain a newline, and we don't call fflush. What causes the prompt to be output?