The final work was created for the purpose of analysis functions and their use in C language. The aim of this study was to describe the role of functions and field using the pointers and create program that will show their use in C. Functions are one of the most complete group of commands in C, they are very important because they allow better visibility of code and make tasks simple. Fields can associated variables of the same type which is very useful, while pointers contain the address of variables and offer a lot of features to developers. In preparing the application, one needed to be careful that the application has no errors to prevent mistakes which would lead to closing of the application. The program performs all the tasks for which it was designed and user can enter dimensions of the matrices, print them on screen and also can perform all of these mathematical operations with matrices. Matrices are displayed in rows and columns, defined by previously dedicated parameters. The programming language used to create an applications is C.