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[Frama-c-discuss] casting from float to ulong and vice versa

  • Subject: [Frama-c-discuss] casting from float to ulong and vice versa
  • From: wintak2009 at gmail.com (Winny Takashi)
  • Date: Sat, 18 Sep 2010 22:29:00 +0200
  • In-reply-to: <AANLkTi=aCpQd-QAJCNZMD8RPC2nrPGa11tRLb5CDYJM+@mail.gmail.com>
  • References: <AANLkTikM4u=PpSpi4vzmAHkHr_+aFg3C4wYb1YJnjV5Y@mail.gmail.com> <AANLkTi=aCpQd-QAJCNZMD8RPC2nrPGa11tRLb5CDYJM+@mail.gmail.com>
Hello,

Thanks for your answer.

however problem seems to occur on biwise "|" too:

//@ requires 0.05 <= a <= 5.0;
unsigned long cnv2(float a)
{
    unsigned long x;
x = (unsigned long)*((unsigned long *)(& a));
Frama_C_show_each_x1(x);
//@ requires 0.1 <= x <= 3.0;
Frama_C_show_each_x2(x);
x = (*(unsigned long *)(&x)) | 2UL;
Frama_C_show_each_x3(x);
return x;
}

I've got many questions on what was displayed on stdout, but mainly:
return value is in --;--
even if frama_c_show_x3 seems more precise.

Best,
WT
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