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Constituent: test_endianness     Tag: linux-gcc
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unsigned int | ui |
unsigned char | uc [4] |
By referencing the same integer as both a 32-bit integer and an array of 4 bytes, one can experimentally determine the endianness of the machine at run time.
If the machine is a little endian machine, element 0 of the array of 4 bytes will match the byte with the least significant portion of the integer, element 1 will match the next least significant portion and so forth.
If the machine is a big endian machine, element 3 of the array of 4 bytes will match the byte with the least significant portion of the integer, element 2 will match the next least significant portion and so forth.
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Reference the value as an array of 4 bytes |
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Reference the value as a 32-bit integer |