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I saw this line of code:
fputc("01234"[(int)tmp_seq[j][i]], opt->fp_bfast);
until now I thought fputc get a character and put it into the output stream.
what does this line of code does
The code is indexing the string
"01234"to choose a character by treating the string as a character array. The index is(int)tmp_seq[j][i].Presumably
(int)tmp_seq[j][i]holds a value between0and4inclusive, otherwise there will be an array indexing out-of-bounds error.