Computer Science (AS & A Level) · May / June 2024 · Paper 23 · Question 8

A teacher is designing a program to process pseudocode projects written by her students. The program analyses a student project and extracts information about each module that is defined (each procedure or function). This information is stored in a global 2D array ModInfo of type string. A module header is the first line of a module definition and starts with either of the keywords PROCEDURE or FUNCTION. An example of part of the array is given below. Row 10 of the array shows that a procedure header occurs on line 27 and row 11 shows that a function header occurs on line 35. "P" represents a procedure and "F" represents a function: x = 1 x = 2 x = 3 ModInfo[10, x] "27" "P" "MyProc(Z : CHAR)" ModInfo[11, x] "35" "F" "MyFun(Y : CHAR) RETURNS BOOLEAN" The string stored in column 3 is called the module description. This is the module header without the keyword. A valid module header will: • be at least 13 characters long • start with the keyword PROCEDURE or FUNCTION. The keyword may appear in either upper or lower case (or a mix of both) and must be followed by a space character. The teacher has defined the first program module as follows: Module Description Header() • called with a parameter of type string representing a line of pseudocode • if the line is a valid procedure header, returns a string: "P<Module description>" • if the line is a valid function header, returns a string: "F<Module description>" • otherwise, returns an empty string For example, given the string: "FUNCTION Zap(X : INTEGER) RETURNS CHAR" Header()returns the string: "FZap(X : INTEGER) RETURNS CHAR"

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