Identify and give the application of the following operators.

(a) / (b) //

This answer depends on what language you're using, but in most languages, "//" is used to precede a one-line remark. "/" is used to divide a number by the other.  For example:

// this is a remark

var foo = x / y;

There are exceptions to both, although the / is almost universally used for division.  One exception would be assembly of course, I don't know if there are any higher level languages that don't use the slash.