I have a unsigned short buffer , it contain a hexa values of IP header .

```
unsigned short buffer = {45,00,00,4E,4E,05,00,10,80,11,0X00,0X00,0A,00,00,1C,1A,00,00,2F};

```

I added `0X00 , 0X00` in the place of Checksum filed and calculated checksum with the **RFC 1071 - Calculating IP header checksum** . So it is returning a `unsigned short checksum` value . Now i need to insert to the Ip buffer .

**For example** : if my `unsigned short checksum value` = `55168` and it's Hex value = `D780` . Now i need to add `D7` , `80` to `buffer[11]` and `buffer[12]` . How can i convert unsigned short checksum value and split the Hex value for inserting to the buffer ? If it Hex = `D78` , then also i need to add `0D` and `78` to the buffer field .