RPN Example

1. RPNMAIN.C
2. RPNGETOP.C
3. RPNSTACK.C
4. RPNGETCH.C

and can be considered to have four ``features'':

1. addition
2. subtraction
3. multiplication
4. division

In reverse Polish notation, each operator follows its set of operands; an infix expression like:

(1 - 2) * (4 + 5)

is entered as

1 2 - 4 5 + * Q

Each test case is terminated by Q to end execution of the target program. Let's say you wanted to find the unique code where the multiplication operation is executed. You would first define a set of test cases, some of which use the multiplication ("*") operator, some of which do not.