C Macro/Function to Convert a IP Address into a 32-bit Integer

We know the IPv4 Address is 32-bit which consists of four integers from 0 to 255 inclusive. We can use a 32-bit integer to represent a valid IP address. The following is a C macro that #defines a procedure to convert a IP address (given four numbers) to a 32-bit integer.

#define IPV4_ADDR(a, b, c, d)(((a & 0xff) << 24) | ((b & 0xff) << 16) | \
        ((c & 0xff) << 8) | (d & 0xff))

We can also use the function implementation:

inline unsigned int 
getIPAddress(char a, char b, char c, char d) {
  return (((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff));
}

To convert a 32-bit integer back to a IP Address, we can shift the number to the right for 24, 16 and 8 bits.

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