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Void pointers: Difference between c and c++

I'm trying to understand the differences between C and C++ with regards to void pointers. the following compiles in C but not C++ : int * p = malloc ( sizeof ( int )); However, here: void foo ( void * vptr ) { } int main () { int * p = ( int *) malloc ( sizeof ( int )); foo ( p ); return 0 ; } Both C++ and C compile it with no complain. Why?