In c++ when you write setprecision (12) for example, 12 is in the base of 10 but when you write it like setprecision (012) it is an octal number,why?
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In c++ when you write setprecision (12) for example, 12 is in the base of 10 but when you write it like setprecision (012) it is an octal number,why?
Because constants with leading zeros (other than leading 0x) are always octal:
C++ draft standard (n1905) §2.13.1
It has nothing at all to do with setprecision.