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// tbs2.cpp
// Built with: g++ -o tbs2 -std=c++11 -Wall -O3 tbs2.cpp (and with 32-
+bit int)
...
   printf("x : 0x%x\n", -268435456);
   return 0;
}

d : -268435456
u : 4026531840
x : 0xf0000000

// ANSI C++ 11: tbs1.cpp
// Built with: g++ -o tbs1 -std=c++11 -Wall -O3 tbs1.cpp
...
   }
   return 0;
}

int32       : HIGH_BITS = -268435456
uint32      : HIGH_BITS = 4026531840
int64       : HIGH_BITS = 4026531840
uint64      : HIGH_BITS = 4026531840

// ANSI C++ 11: tbs4.cpp
// Built with: g++ -o tbs4 -std=c++11 -Wall -O3 tbs4.cpp
...
   std::cout << "b2         = " << b2 << "\n";
   return 0;
}

0xFFFFFFFF = 4294967295
0xF0000000 = 4026531840
HIGH_BITS  = 4026531840
b1         = 11110000000000000000000000000000
b2         = 11110000000000000000000000000000