Why does the code while(!feof(infp)) { fgets(buf, MAXLINE, infp); fputs(buf, outfp); } copy the last line twice?
In C, EOF is only indicated after an input routine has tried to read, and has reached end-of-file. (In other words, C's I/O is not like Pascal's.) Usually, you should just check the return value of the input routine (fgets in this case); often, you don't need to use feof at all.
References:
K&R2 Sec. 7.6 p. 164
ANSI Sec. 4.9.3, Sec. 4.9.7.1, Sec. 4.9.10.2
ISO Sec. 7.9.3, Sec. 7.9.7.1, Sec. 7.9.10.2
H&S Sec. 15.14 p. 382
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