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Big Endian or Little Endian.

#include <stdio.h>

int w = 0x41000042;
int main()
{

if( 'A' == *(char*)&w ) {
printf("First char in integer is %c ", *(char*)&w);
printf(", so Big Endian\n");
} else {
printf("First char in integer is %c ", *(char*)&w);
printf(", so little endian\n");
}
}

 

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