GCSE Link: 2.03 (Operations)
Again, there is nothing new on this page. Everything below has been copied over from the GCSE link.
Operators in Computer Science are just like operators in Maths: they are symbols which perform certain functions on data.
Arithmetic operators work on numbers. Most of them are basic Maths.
Table 1 shows the arithmetic operators.
Table 1
| Name | Operator | Example | Result |
|---|---|---|---|
| Addition | + |
3 + 6 |
9 |
| Subtraction | - |
7 - 2 |
5 |
| Multiplication | * |
5 * 8 |
40 |
| Division | / |
10 / 4 |
2.5 |
| Integer (floor) division | // (or DIV) |
11 / 3 |
3 |
| Modulus (remainder) | % (or MOD) |
12 % 5 |
2 |
Comparison operators give a boolean result.
Table 2 shows the comparison operators.
Table 2
| Name | Operator | True | False |
|---|---|---|---|
| Equal to | == (or =) |
7 == 7 |
7 == 8 |
| Not equal to | != (or ≠) |
5 != 8 |
5 != 5 |
| Less than | < |
4 < 6 |
4 < 3 |
| Greater than | > |
6 > 5 |
6 > 6 |
| Less than or equal to | <= (or ≤) |
3 <= 7 |
3 <= 2 |
| Greater than or equal to | >= (or ≥) |
8 >= 8 |
8 >= 9 |
Boolean operators work on booleans.
Table 3 shows the boolean operators.
Table 3
| Operator | C# Symbol | True | False |
|---|---|---|---|
AND |
&& (or & for bitwise) |
true && true
|
false && false false && true true && false
|
OR |
|| (or | for bitwise) |
false || true true || false true || true
|
false || false
|
XOR |
^ (same for bitwise) |
false ^ true true ^ false
|
false ^ false true ^ true
|
NOT |
! (or ~ for bitwise) |
!false |
!true |
Evaluate the expression ((10 * 6 / 4) <= (1 + 2 * 5)) ^ ((17 % 5 + 3) != (14 - 6))
This evaluates to (15 <= 11) ^
(5 != 8), which is
false ^ true,
which is true.