How do you calculate using c plus plus language?

Answer 1

C++ is not an interpreted language and therefore does not support real-time calculations. That is, you cannot enter an immediate calculation in C++ and expect an immediate result -- you must encode the calculation, then compile and link the code, and finally run the program to get the result.

During debugging, however, your IDE may allow you to use watches as a type of calculator. For instance, when you hit a breakpoint, you can add a watch to perform the calculation, and make use of any variables that are in scope within that calculation, and obtain an immediate result from that calculation.