Operators let you work with values. The arithmetic operators are the ones you already know from math class — addition, subtraction, multiplication, division, and modulo. C++ uses them the same way, just with a slightly different symbol for multiplication and modulo.
Arithmetic Operators
+— addition-— subtraction*— multiplication/— division%— modulo (remainder of division)
One thing to watch out for — when you divide two integers, C++ performs integer division.
That means 7 / 2 gives you 3, not 3.5. If you
want decimal results, make sure at least one of the values is a double or float.
#include <iostream>
using namespace std;
int main() {
int a = 10, b = 3;
cout << "a + b = " << (a + b) << endl;
cout << "a - b = " << (a - b) << endl;
cout << "a * b = " << (a * b) << endl;
cout << "a / b = " << (a / b) << endl;
cout << "a % b = " << (a % b) << endl;
cout << "a / (double)b = " << (a / (double)b);
return 0;
}
See the last line? By casting b to double, we get the
decimal result 3.33333 instead of 3. We will talk more
about type casting later.