Answer :
Double click on boarder width an height will automatically adjust.
Manual procedure are following:
1.Open desire file of spreadsheet
2. Click on home tab in cell group and then click format.
3. Under cell size click on default width.
4. In standered column width box type new measurements and then click OK.
Public key and private key - In public key encryption, a pair of keys is used (public key and private key). The public key can be made available publicly, while the private key is only known by the owner. The public key is used to encrypt the message, while the private key is used to decrypt the message.
Im not sure if you mean in or by but heres my answer: Basically to attempt to exploit a private network, control over computers, viruses and such.
As far as humans are concerned. What's written in the programming language needs to interpreted or compiled into something that the machine can actually deal with.