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How to check whether a system is big endian or little endian?
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We can also check the endianness of the machine using the union. We need to create a union that has an integer variable and an array of 4 characters. If the first element (au8DataBuff [0]) of the character array is equal to the LSB Bytes of integer, then the system will be little endian otherwise big-endian.
Big-endian is an order in which the "big end" (most significant value in the sequence) is stored first, at the lowest storage address. Little-endian is an order in which the "little end" (least significant value in the sequence) is stored first.
The x86 processors use little-endian byte ordering. The least significant byte (LSB) of an integer is stored at the lowest address of the integer. The most significant byte is stored at the highest address for data items in this processor.
In C, C++
int n = 1; // little endian if true if(*(char *)&n == 1) {...} See also: Perl version
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