Variables name in C

Variable is the name given to the memory location, it is not the actual memory, it is just the name to the memory location.

Variable name can be in UPPER CASE or it can be also in lower case.

Variable can also have underscore( _ ) and numbers. Apart from this variable can't have anything else.

Variable can be started with only alphabets ( UPPER and lower case) and underscore but not with numbers , numbers and underscore can be used in the middle of the variables.