<Operators and expressions>
-> expression and arithmetic operators
| Operators | description | Synthesis |
|---|---|---|
| + | Monocular positive | From right to left |
| - | Monocular negative | From right to left |
| * | Multiply | from left to right |
| / | In addition to and divisible | from left to right |
| % | Remainder | from left to right |
-> assignment operator and expressions
1. simple assignment operator: '='
2. meet assignment operator: '= +', '- =', '* =' '/ =', '% ='
3 particular assignment operator: '+', '-'
-> comma operator and expressions
in the C language comma operator is also a, its function is to connect together two expressions
, for example: a = (x = a + b), (b + c)
-> bitwise and expressions
1 and operator (&)
| Left computation | Right computation | & Operation result |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
2. OR operator (|)
| Left computation | Right computation | Shu result of the operation |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
3. The exclusive-OR operator (^)
| Left computation | Right computation | ^ Operation result |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
4. bitwise operator ( "<<" or ">>")
is generally in the form of shift operation: <computation> <Operator> <Expression>
-> relational operators and expressions
| Operators | Function Description |
|---|---|
| > | more than the |
| >= | greater or equal to |
| < | Less than |
| <= | Less than or equal |
| == | equal |
| != | Unequal |
-> Logical operators and expressions
1. The logical operators (&&)
binary operator, only two calculation amounts are 1, the result was 1.
| Left computation | Right computation | && operation result |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
2. Logical Operators (Shushu)
When two operation amount calculation, as long as there is a 1, the result is 1.
| Left computation | Right computation | Shu Shu result of the operation |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
3. Non-operator (!)
Unary operators, when calculating the amount of non-operation, the result negated.
| 运算量 | ！运算结果 |
|---|---|
| 0 | 1 |
| 1 | 0 |
->sizeof操作符
sizeof是一个单目运算符，它的运算对象是变量或数据类型，运算结果为一个整数。运算的一般形式siziof(<类型或变量名>)
->条件运算符
条件运算符（? :）是C语言中的唯一一个三目运算符他可以提供if--then--else语句的简易操作
<表达式1>?<表达式2>:<表达式3>
例如：(a = 5;b = 1)a>b? yes:no ---> 结果返回yes
->运算符优先级
内容较多，不再详细说明
运算符的优先级口诀
| --------口诀-------- |
|---|
| 括号成员第一 |
| 全体单目第二 |
| 乘除余三，加减四 |
| 移位五，关系六 |
| 等于与不等排第七 |