Description: In this case four times the output of a, b values, but because of the format control string is different from the results of the output is not the same. The fourth line of the output control string in the format statement, the two format string d a space between the (non-format characters), so the output of a, b there is a space between. The fifth line of the statement printf format string to control the format by adding the non-comma characters, so the output of a, b the value of a comma in between. The sixth line of the format requested by the character string output a, b values. The seventh line of the output results in order to prompt an increase of non-format string.
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