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Data Structures Preliminaries (Refresher of Fundamentals in C++)

Menu-Based Implementation of the Matrix Calculator

Explore how to build a menu-driven matrix calculator in C++ by using operator overloading. Understand the implementation of arithmetic, unary, comparison, and rotation operations on matrices while managing user inputs and program flow.

We'll cover the following...

Implementation of the matrix calculator

Here’s the playground containing all the operator overloading implementations we learned in the previous lessons.

4

2 2
1 2 
4 5

2 2
7 8 
2 2

3 3
4 7 5
9 8 5
3 7 2

4 3 
4 6 5
3 3 4
5 8 9
4 5 3
Implementation of the matrix calculator

Let’s review the code in the main.cpp file:

  • Lines 1–11: We’ve written a PrintMatrices() function that takes a double pointer of type Matrix and an integer NOM representing the number of matrices to print.

  • Lines 12–24: We’ve written a LoadingMatrix() function that reads the matrices from the Matrix.txt file and loads them to Ms array.

  • Lines 25–36: We’ve created a menu that’s displayed to the user so that the user can select which operation to perform on matrices using the menu() function.

  • Lines 37–45: In these lines, we’ve started the main() function and initialized the matrices by calling the LoadingMatrix() function, and we’ve declared some variables that’ll be used later.

  • Lines 46–302: These lines indicate the while loop that runs until the STOP flag is false. We can set the STOP flag true by selecting the 8th option from the menu.

  • Lines 49–51: We’ve displayed the menu using the menu() function and asked the user for input. We’ve developed a switch structure based on the input that performs the relevant operations according to the user’s selection.

  • Lines 54–89: The first choice is the binary arithmetic operations on two matrices and store the result in the third matrix.

  • Lines 90–125: The second choice is the accumulation assignments (+=, -=, *=, /=). In these operations, the output of the operation is stored in the left matrix.

  • Lines 126–162: The third option is to perform unary scalar arithmetic, in which we perform the arithmetic operations on the matrix using a scalar int or float value.

  • Lines 163–219: The fourth option is to perform increment/decrement operations on a matrix.

  • Lines 220–249: The fifth option is the unary operations (-, !, ~). These operators are implemented to perform a matrix’s unary minus (negation), transpose, and inverse.

  • Lines 250–260: In the sixth option, two matrices are compared.

  • Lines 261–288: We’ve set the flag to terminate the loop in the eighth option.

  • Lines 289–299: This default option displays the error message to the users, indicating they input the wrong option and terminates the program.

The given code appears to be implementing a menu-based program for performing various operations on matrices. The program allows the user to choose different options such as binary arithmetic, accumulation assignments, unary scalar arithmetic, unary increment/decrement, unary operations, comparison of matrices, rotation of matrices, and exiting the program.

The program continues to execute until the user chooses to exit. Each menu option corresponds to a different operation on matrices, such as performing arithmetic operations, incrementing/decrementing matrix values, calculating unary operations, checking matrix equality, and rotating matrices.