C++ has the following operators:
An actual program would not use a statement such as X=5+3; it would save time to simply use X=8. An actual program would be more likely to use variables: X=Y+Z; for example.
Note that there is a times, or multiplication, operator: *. In algebra, variables are always a single letter, XY in algebra means X times Y. In programming, variables can be several letters, and we could not be sure whether XY meant X times Y or a variable called XY.
Notice that operations on two integers results in an integer. If we divide 9/2 we get just 4. If we want 4.5 we must make one of the operands a double or float.
The % operator is used to find the remainder. Before children learn about decimal numbers, they may give the answer to division problems as: "17 divided by 5 is 3 with a remainder of 2" Note that 17/5 results in 3, while 17 % 5 results in 2.
Introduction to C++ Programming