Conversion from integer to real
ID0000060: This issue was created automatically from Mantis Issue 60. Further discussion may take place here.
| Id | Project | Category | View | Due Date | Updated |
|---|---|---|---|---|---|
| ID0000060 | Frama-C | Kernel | public | 2009-04-23 | 2014-02-12 |
| Reporter | gmelquio | Assigned To | virgile | Resolution | fixed |
| Priority | normal | Severity | major | Reproducibility | always |
| Platform | - | OS | - | OS Version | - |
| Product Version | Frama-C GIT, precise the release id | Target Version | - | Fixed in Version | Frama-C Beryllium-20090601-beta1 |
Description :
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?