VS2008 C++: int32_t num = 0502; // num = 322

Question

I'm using Visual Studio 2008 Express. If I debug this program, the variable num holds the value 322, even when it's initialized to 0502. What am I missing here?

int main()
{
    int32_t num = 0502;

    return 0;
}

int32_t is defined in the portable version of pstdint.h Version 0.1.12 as

typedef signed long int32_t;

@rubenvb It's not a duplicate - that question is a hint (if you don't know what octal digits are.) — David, Jun 14 '13 at 13:07

score 7 · Accepted Answer · answered Jun 14 '13 at 05:33

7

0502 is octal, since it has prefix 0. 502 in octal is 322 in decimal.

answered Jun 14 '13 at 05:33

ForEveR

55,233
2
119
133

Right. Thanks. After 10 years of programming, this is the first time I come across the notion of octals. – damian Jun 14 '13 at 05:37
I just found this entry about the history of octals and it's use nowdays. Very interesting. http://programmers.stackexchange.com/questions/98692/where-are-octals-useful – damian Jun 14 '13 at 05:48

score 3 · Answer 2 · answered Jun 14 '13 at 05:34

3

If you start a integer value with 0 it is considered as an octal number, similarly 0x is used for hex.

answered Jun 14 '13 at 05:34

Asha

11,002
6
44
66

VS2008 C++: int32_t num = 0502; // num = 322

2 Answers2