debuger show inadequate values

#include <string.h>
#include <stdio.h>
#include <LPC214x.H>


volatile int rc=0;
volatile float A0 = 15.2, B0 = 0.152;
int tst(const int iprivod,int id0, float iV0)
{  int iS0, iS2, it0, idx1, idt, iS_m=0x1234, it_m;
   iS_m = (int)(A0 * A0 /B0);
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
//Locals window show here 0x40000468 for iS_m
//and 0x000005F0 if next line is commented

   iS_m = A0 * A0 ;
   it_m = A0/B0+0.5;
   id0 = iS_m;
   if(iV0 < 0.)
   {
      it0 = iV0/B0+0.5;
   } else {
     iS0 = iV0*iV0/(B0*2.);
   }
   if(id0 <= iS0)
   {     if(iprivod > 0)
                 {
            idx1 = 123;
                 } else idt = 321;//it_m;
         return 0;
   }

   iS2 = (id0 + iS0);

   if(0x1235 > iS_m)
   {
return iS_m;
   }
return 2;

}

int main (void)
{
  while(1)
  {
  rc=  tst(1,1520, 0.);
  }
}