How to use a variable declared using C syntax in Assembly file

 RE: Not language specific

void fun(void)
{
  data byte var1;

  if(var1 & 0x80)
  {
    //some code
  }
if( (var1 & 0x04)||(var1 & 0x03) )
{
   //some code
}
...
...
}

 Insert a function call, and pass a parameter

void fun(void)
{
  data byte var1;

   if(var1 & 0x80)
   {
     //some code
   }

   if( (var1 & 0x04)||(var1 & 0x03) ) // Convert this bit?
   {                                  //
      //some code                     //
   }                                  //
...
...
}