Conversion from integer to real
ID0000060: This issue was created automatically from Mantis Issue 60. Further discussion may take place here.
|Product Version||Frama-C GIT, precise the release id||Target Version||-||Fixed in Version||Frama-C Beryllium-20090601-beta1|
While the documentation says that "there are implicit coercions for numeric types: integer is itself a subtype of type real" and that cast are allowed in logic expressions, neither seem to work.
/*@ ensures 1.0 == 1; */ void f();
/*@ ensures 1.0 == (real)1; */ void g();
When running "frama-c test.c" (revision 5096), I get
File test.c, line 1, characters 19-20: Error during analysis of annotation: invalid cast between real and integer. Use conversion functions instead test.c:1: Warning: Ignoring specification of function f File test.c, line 4, characters 19-26: Error during analysis of annotation: cannot cast to logic type test.c:4: Warning: Ignoring specification of function g
The error message talks about some "conversion functions", but there are no such things in the documentation. The Jessie plugin seems to know about a \real_of_int function, but the CIL front end does not. So how does one convert an integer to a real, if neither implicit nor explicit casts work?