March R. Smith - University of St Thomas - Minnesota QMCS 130: Today’s Class Functions and Array ArgumentsFunctions and Array Arguments ExamExam Lab 12Lab 12

March R. Smith - University of St Thomas - Minnesota Arrays in RAM Just a row of variablesJust a row of variables Pick out a variable using the “index”Pick out a variable using the “index” NO built-in information about sizeNO built-in information about size Two ways to indicate an array’s sizeTwo ways to indicate an array’s size –Separate integer(s) containing its size –A ‘sentinel value’

March R. Smith - University of St Thomas - Minnesota How do we pass arrays? What does the function get when we pass an array?What does the function get when we pass an array? How do we signal the size of an array?How do we signal the size of an array? –How do we deal with ‘variable length’ arrays? –How do we mark the end of an array of chars (a string)? –How do indicate the number of elements in other arrays?

March R. Smith - University of St Thomas - Minnesota How do we pass arrays? The function gets the array’s location in RAMThe function gets the array’s location in RAM The array must indicate its end somehowThe array must indicate its end somehow –Option: provide second parameter with the array size –Option: put a ‘sentinel’ at the end of the array, like in strings

March R. Smith - University of St Thomas - Minnesota Lab 12 Four functions: min, max, sum, avgFour functions: min, max, sum, avg –Input: array info –Output: result of that operation –NO Text/Display Input or Output in these functions! –Do printf() back in the main() section. Run functions on 2 arrays of different sizesRun functions on 2 arrays of different sizes First 3 each have a loopFirst 3 each have a loop Fourth (avg) can call ‘sum’Fourth (avg) can call ‘sum’ Why keep printf() separateWhy keep printf() separate –Technical – there are times I/O is troublesome

March R. Smith - University of St Thomas - Minnesota Exam 140 points140 points -14 – cutoff between A and B-14 – cutoff between A and B -28 – cutoff between B and C... etc.-28 – cutoff between B and C... etc.

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