difference between c/c++ - "Not all C is C++"

eveyone knows c++ is made compatible with c but still ther are few codes which run fine on c but when we run the same using g++ compiler it gives error.
write such situation and why such things are not implemented in c++

int func()

in c++ is same as
int func(void)

but in c it means any number of arguments of any datatype.

are bahi logo aur bahut se cases aese hai jahan c program run karta hai but c++ error deta hai.kuch to post karo

yes, there is some thing with static variables being external by default in c...right??
but can anybody give an proper example,with explanation.

in C++ function declaration is must before its use...but in C bina declaration ke bhi cal jaata hai....

in C anything can be assigned to void pointer. But in C++ nothing can be assigned to void pointers unless typecasted.

in C ,a function if declared without a return type,its automatically taken as int.
not the case in c++(i think its an error).

in c function with no argument represent any no of arguments while in c++ it represent no argument


abih to aur bhi difference hoge abhi to