Arithmetic operators
In Java there are the usual arithmetic operators, as in most other programming languages, namely addition, subtraction, multiplication, division and the remainder operator (modulo). In addition, there are the one-digit operators for positive and negative sign as well as the increment and decrement operators. The arithmetic operators expect numeric operands and return a numeric return value.
| Operator | Description | Priority |
|---|---|---|
| + | Positive sign | 1 |
| – | Negative sign | 1 |
| ++ | Increment | 1 |
| — | Decrement | 1 |
| * | Multiplication | 2 |
| / | Division | 2 |
| % | Rest (modulo) | 2 |
| + | Addition | 3 |
| – | Subtraction | 3 |
Code Explanation
| Line | Description |
|---|---|
| 3 – 5 | Initializes the integer variables a with value 6 and b with value 4,the variable c of type long with value 7and the variable of type double with value 0 |
| 7 – 8 | Outputs the starting values |
| 10 – 13 | Divide variable a by b. The result is automatically rounded, because the values are integers |
| 15 – 17 | Divides variable a with variable b and performs a type conversion beforehand (int to double) |
| 19 – 20 | Assigns the value of variable c to variable a as an integer |
public class BasicArithmeticExpressions {
public static void main(String[] args) {
int a = 6, b = 4;
long c = 7;
double z = 0;
System.out.println("Starting Values");
System.out.println("a = " + a + "\nb = " + b + "\nc = " + c + "\nz = " + (int) z);
System.out.println("Calculations");
// works, but wrong result because of integer
z = a / b;
System.out.println("z = " + a + " / " + b + " = " + z + "\n");
// An explicit type conversion is carried out with the cast operator
z = (double) a / (double) b;
System.out.println("z = " + (double) a + " / " + (double) b + " = " + z);
a = (int) c;
System.out.println("a = " + a);
}
}Output
Starting Values
a = 6
b = 4
c = 7
z = 0
Calculations
z = 6 / 4 = 1.0
z = 6.0 / 4.0 = 1.5
a = 7