BAD_FUNCTION_POINTER.C11

    #include <stdint.h>
    #include <stdio.h>

    typedef void     ( any_func )(    void        );
    typedef uint32_t ( u32_func )( uint32_t a );
    typedef uint64_t ( u64_func )( uint64_t a );

    uint32_t imp_u32_func(

        uint32_t a
    ){
        return( a );
    }

    uint64_t imp_u64_func(

        uint64_t a
    ){
        return( a );
    }

    u32_func* ptr_u32_func = (u32_func*)(any_func*)&( imp_u64_func );
    u64_func* ptr_u64_func = (u64_func*)(any_func*)&( imp_u32_func );

    int main( void ){

        printf("[hello_world]\n");

        uint64_t big =( 0xFFFFFFFFFFFFFFFF );
        uint32_t lit =( 0xFFFFFFFF         );

        uint64_t v64     ;
        uint32_t v32     ;
        uint64_t v64_too ;

        v64    =( ptr_u64_func( big ) );
        v32    =( ptr_u32_func( lit ) );
        v64_too=( ptr_u64_func( big ) );

        printf( "[big]:::::%llu\n", big     );
        printf( "[lit]:::::%u\n"  , lit     );

        printf( "[v64]:::::%llu\n", v64     );
        printf( "[v32]:::::%u\n"  , v32     );
        printf( "[v64_too]:%llu\n", v64_too );

    }