APCO 1P93 Lecture Notes - Lecture 10: Array Data Structure, Bounds Checking, Linear Search
27 Apr 2016
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Instead of creating multiple similar variables such as employee1, employee2, employee3 and so on : it"s more efficient to create just one variable. Declare real salesamounts[7: the number in the [ ] is the size of the array. The storage locations in an array are elements. Each element of the array has a unique number called a subscript that identifies it the subscript starts at 0 in most languages. Assigning values can be done individually using a subscript . But, it is much more efficient to use a loop to step through the array. Arrays can be initialized to 0 or specific values. Array bounds checking should be performed to avoid use of an invalid subscript. Days[7] = saturday is invalid because there is no 7 index: a common error is running a loop one time more than is necessary, exceeding the bound of the array, off-by-one error.
