1- Unzip downloaded file.
2- you must have NodeJS and angular-Cli on your computer.
3- After unzipping file, open project file and press right click on the background of the folder. Open cmd.
4- Write npm install in cmd window.
5- Then you can open the project by writing ng serve –open in cmd window (port number: 4200).
6- Open Eclipse ide or any other ide.
7- Import whole Spring boot folder into ide.
8- Make sure while running the code that port number inside (Crossorigin is the same port number of angular project).
1- Run Angular Code while Running Spring boot program to be able to receive data from front end.
2- As shown the picture this page will appear in the browser which contains calculator as shown in fig.1
Figure 1 Calculator Interface
Figure 2 Directly entering the operand.
3- When entering operator, we can enter operator directly so operand 1 will be considered zero as default and the calculator will wait to enter second operand like shown in second figure. We can enter operator first then operand like any normal calculator.
4- When we want to evaluate any expression, enter only two operators with one decimal point only in each operand then click on equal sign.