+uint32_t a1 = 0xfedcba98;
+uint64_t b1 = a1<<8;
+std::cout<< "sizeof(uint32_t) " << sizeof(uint32_t)
+ << " sizeof(uint64_t) " << sizeof(uint64_t) << std::endl;
+
+std::cout<< std::hex <<a1 << " " << b1 << std::endl;
+b1 = 0xfedcba98;
+uint64_t b2= 0x76543210;
+b1= b1<<32|b2;
+std::cout<< std::hex <<b1 << " " << b2 << std::endl;
+