Composite functions are made when the output from one function is used as the input of another function. The names of the functions are written next to each other, with the function that is used first ...

main.cpp: This file holds the main function that creates an instance of the calculator and "runs" it, allowing the user to start inputting commands and performing operations. RPNCalc.cpp: This file ...

I developed a calculator using 4x4 matrix keypad as input and used the oled screen as output and for additional function I added a led which will light up when the system shows the result. - ...