We can't stress the importance handling character case correctly. Here are the two functions you need to know and use correctly.
In order to convert all characters in a sting to lowercase, use the LOWCASE function. Example:
*convert it to lowercase;
In order to convert all characters in a sting to uppercase, use the UPCASE function. Example:
*convert it to uppercase;
We can't stress the importance of keeping this functionality in mind. Many a SAS script has gone awry because a developer didn't take character case into account when using conditional or search statements.
TIP: A solid programming practice is to convert everything to lowercase before storing it. There are exceptions to this (like names, etc), but they can be handled on a case basis.
Also note the PROPCASE function. It capitalizes the first letter of each word in a string. Example:
This Is The New Prop Var.