png_exp16bit      874 contrib/libtests/tarith.c          double error = png_exp16bit(i) - correct;
png_exp16bit      881 contrib/libtests/tarith.c                   " error: %f\n", i, png_exp16bit(i), correct, error);
png_exp16bit     3722 png.c                      return png_exp16bit(res);