C++ provides five arithmetic operators: addition +, subtraction -, multiplication *, division /, and modulo %. These work on numeric types like int and double. You write arithmetic expressions like math: int sum = 10 + 5; evaluates to 15.
The operator sits between two operands and produces a new value. Division and modulo behave differently with integers versus floating-point. If you ignore these differences, you get truncated results when you expect decimals.