Tech Interview Exposed: determine whether a machine's byte order is big-endian or little endian and convert from one to another

Thursday, December 27, 2007

determine whether a machine's byte order is big-endian or little endian and convert from one to another

1 comments:

Admin said...: Link to understand the concept
http://www.cs.umass.edu/~verts/cs32/endian.html

code to check the machine type :

int num = 1;
if(*(char *)&num == 1)
{
printf("\nLittle-Endian\n");
}
else
{
printf("Big-Endian\n");
}

code to convert from one Endian to another.

int myreversefunc(int num)
{
int byte0, byte1, byte2, byte3;

byte0 = (num & x000000FF) >> 0 ;
byte1 = (num & x0000FF00) >> 8 ;
byte2 = (num & x00FF0000) >> 16 ;
byte3 = (num & xFF000000) >> 24 ;

return((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | (byte3 << 0));
}; December 27, 2007 at 10:16 AM

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