Arrays in programming language C are used as a simplified mechanism to store a group of data of the same type making easier to perform mathematical operations and functions over them. For this reason, a frequent programming challenge is the effective work with arrays in the programming language C. In this paper, functions for some of the most common array operations are implemented, such as initialization, loading, printing, finding odd and even numbers, the largest and smallest numbers among them, multiplication of matrices, etc. The programming language C has three different types of memory, which are implemented as the static, dynamic memory and the heap memory. Global variables are stored in the static memory, the variables contained in functions are stored on stack, while the heap memory is a part of the memory that needs to be reserved in advance in the program code and it is not managed by the computer automatically, instead this task falls on the programmer. Arrays in the programming language C can be one-dimensional, which are vectors and strings or are multi-dimensional, such as matrices.