fopen             510 main.c         	in = fopen(f_name_in, "rb");
fopen             515 main.c         	out = fopen(f_name_out, "wb");
fopen             561 main.c         	in = fopen(f_name_in, "rb");
fopen             566 main.c         	out = fopen(f_name_out, "wb");