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Pascal Programming Complex Array Structures Pascal Programming Complex solutions, using Pascal or any other language, need to be reduced from the abstract to more concrete statements. The example in the text of parallel arrays to award a score and letter grade illustrates the validity of the observation. Pascal Programming Score Index 1 Score Index 2 Grade Grade Score Grade Score Grade Pascal Programming The solution to the problem arises from dual arrays with a single index. Thus, data type notation and data structure become tightly related. Data structure– any construct to store and manipulate data in a program or algorithm. Pascal Programming In this solution, each array type is a data type. The data structure combines the two arrays. With these examples we know that available structures can include arrays of arrays and parallel arrays. Pascal Programming Complex solutions require complex data structures. An array’s component type can be comprised of any data type . . .so, it can be an array type. Thus we have an array or array types. Consider a spreadsheet example . . . Pascal Programming 1A 1B 1C 2A 2B 2C 3A 3B 3C Pascal Programming If we substitute Sales for 1-3 and Territory for A-C, we reference 2C as … – Sales  Territory Within the territory we have a monthly array of sales. This illustrates the use of an array of array type. Pascal Programming An array with more than one index is called a multidimensional array. The declaration follows the form use to declare a simple or one dimensional array. Multidimensional arrays have more than one index but they have similar other properties.