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Hi, I am using Function to Pointer. i have definded this functin poiter in one structure with two long variable argument. it is giving me error below. Error C212: indirect call: parameters do not fit within registers. though it is given in c51.pdf that it will pass funciton argument with two long variable, i face this error. expecting solution as soon as possible code is like this typedef struct { unsigned long var1; unsigned long var2; void (*funptr) (unsigned long var1,unsigned long var2); }test; void main() { struct test *pt,t; t.vars1 = 6550; t.vars2 = 6551; t.funptr = TESTING; // where TESTING is fucntion definition macro pt->funptr(pt->var1,pt->var2); // here i get error listed above } thanks niraj