What is the solution for this loop problem? [closed]

Good day everyone, I would like to ask of how to start this kind of problem.

Create a program that continually accepts input from the user.

The input shall be in this format operator number like +2.

If the input is not in the format, your program will display:

Invalid input, try again. This will display until a valid input is achieved.

If the input is -0. The program will stop and display the output:

The result of +1-3/5*3 is -1.2

In the example, the inputs of the user are +1, -3, /5, and *3.

 

Noted: Make necessary conditions to avoid errors.