C TutorialLesson 18Free preview

C Arrays

This lesson is part of C · All levels

Summary

An array is a container for storing many values of the same type in one named variable, accessible via an index number starting at 0. The size of the array must be a constant known at compilation and written in square brackets, e.g. int numbers[5]. The last element of an array n-sized has an index of n-1, so access to the index of n will cross the memory limit. Arrays are very efficient at processing data sets sequentially and repeatedly.

Key points

The array index in C always starts from 0
The last element of an array of n dimensions is at the n-1 index
All elements in an array must be of the same type
Access outside the index (out of bounds) is dangerous and unimpeded compiler

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