reading negative zero from a string

The code sscanf("-0", "%d", &x) returns -2147483648 (hex 80000000) if x is an integer or long.

This is causing a problem in my radar test tool when I try to parse a string containing latitude/longitude coordinates in order to separate it into degrees and minutes.  For example, sscanf("-0:12.34", "%d:%f", &deg, &min) will return -2147483648 for the degrees.

I'm using LabWindows 2013/2015 on Windows 7/10.