I have been practicing coding problems online. Currently I am working on a problem statement Problems where we need to convert Big Endian <-> little endian. But I am not able to jot down the steps considering the example given as:
123456789 converts to 365779719
The thing you need to realize is that endian swaps deal with the bytes that represent the integer. So the 4 byte number 27 looks like
0x0000001B. To convert that number, it needs to go to
0x1B000000... With your example, the hex representation of 123456789 is
0x075BCD15 which needs to go to
0x15CD5B07 or in decimal form 365779719.
The function Stacker posted is moving those bytes around by bit shifting them; more specifically, the statement
i&0xff takes the lowest byte from
<< 24 then moves it up 24 bits, so from positions 1-8 to 25-32. So on through each part of the expression.
For example code, take a look at this utility.