double f(int a, char b, double c){
  ...
}


void g(void){
   int i = 6;
   char ch = 'x';
   double c = 5.6;

   ...
   ...  3.4 + f(i + 7, ch, c)  ...
   ...

   f(i * i, 'y' + 1, (double)i);
   ...
}