186 lines
5.1 KiB
Markdown
186 lines
5.1 KiB
Markdown
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---
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title: Operators
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localeTitle: 运营商
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---
# 经营者:
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* 操作员允许您对数据执行操作。
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* 正在操作的数据称为_操作数_ 。
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* C ++中不同类型的运算符是:
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* _OPERANDS_是操作员执行某些命令的数据。
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* 运算符有3种类型:一元(适用于1个操作数),二元(适用于2个操作数),三元(适用于3个操作数)。
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### 1 I / O操作符 -
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* 这些运算符允许您直接输入和输出。
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## 输入曝气器“>>”##
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用于从标准输入读取数据(“cin”语句)。
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## 输出运算符“<<”
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用于在`cout`语句中发送输出。
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### 2算术运算符 -
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* 这些运算符允许您执行基本的算术运算。
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1. `+`运算符_添加_两个操作数。
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2. `-`运算符_减去_两个操作数。
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3. `*`运算符将两个操作数_相乘_ 。
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4. `/`运算符_除以_并给出两个操作数的_商_ 。
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5. `%`运算符_除以_并给出两个操作数的_其余部分_ 。 (或者,对于更具数学倾向的读者, `a % b`基本上是“a mod b”的结果
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### 使用算术运算符的示例:
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\`\`\`CPP
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# 包括
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使用命名空间std;
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int main() { int a = 5; //第一个操作数 int b = 10; //第二个操作数
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```
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cout << "+ operator " << a+b << "\n"; //Add
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cout << "- operator " << ab << "\n"; //Subtract
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cout << "* operator " << a*b << "\n"; //Multiply
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cout << "/ operator " << b/a << "\n"; //Find Quotient
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cout << "modulus operator " << b%a << "\n"; //Find remainder
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return 0;
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```
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} \`\`\`
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输出:
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```
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+ operator 15
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- operator -5
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* operator 50
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/ operator 2
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modulus operator 0
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```
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[亲自尝试一下代码吧! :)](https://repl.it/Mge9)
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### 增量运算符:
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* `++`被称为增量运算符。它将整数变量的值增加1。
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2种增量:
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* 预增量首先递增该值然后使用它。示例: `int a ; ++a;`
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* 后增量首先使用变量然后递增它。示例: `int b; b++;`
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### 减量运算符:
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* `--`被称为减量运算符。它将整数变量的值减1。
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减少的两种类型:
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* 预递减首先递减该值然后使用它。示例: `int a ; --a;`
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* 后递减首先使用变量然后递减它。示例: `int b; b--;`
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递增和递减运算符的示例:
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```cpp
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#include <iostream>
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using namespace std;
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int main()
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{
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int a = 3 ,b = 4;
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// INCREMENT
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cout<< "Value of int a PRE INCREMENTED : " << ++a << "\n";
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cout<< "Value of int b POST INCREMENTED : " << b++ << "\n";
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cout<< "Value of b is changed after using once : " << b << "\n";
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// DECREMENT
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cout << "\n"; //go to next line
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a = 10; //Assigning a new value to a
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b = 10; //Assigning a new value to b
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cout << "Value of int a PRE DECREMENTED : " << --a << "\n";
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cout << "Value of int b POST DECREMENTED : " << b-- << "\n";
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cout << "Value of b is changed after using once : " << b << "\n";
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return 0;
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}
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```
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输出:
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```
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Value of int a PRE INCREMENTED : 4
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Value of int b POST INCREMENTED : 4
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Value of b is changed after using once : 5
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Value of int a PRE DECREMENTED : 9
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Value of int b POST DECREMENTED : 10
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Value of b is changed after using once : 9
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```
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[亲自尝试一下代码吧! :)](https://repl.it/Mgg4/2)
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### 3:关系运算符:
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* 这些运算符告诉我们两个操作数之间的关系并返回一个布尔值(0或1)。如果关系为`true`则结果为1。如果实现是假的,则结果为0。
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* 6个关系运算符是:
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1. 小于`<`
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2. 大于`>`
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3. 小于或等于`<=`
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4. 大于或等于`>=`
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5. 等于`==`
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6. 不等于`!=`
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### 4:逻辑运算符:
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* 这些运算符组合了逻辑运算的表达式他们是 :
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1. 逻辑AND `&&` :如果两个值都为真,则求值为true。
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2. 逻辑OR `||` :如果任何值为true,则求值为true。
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3. 逻辑不`!` :如果_表达式_为true,则_表达式_为false。该运算符反转了真值,是一元运算符。
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### 5.三元运营商:
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`?:`运算符是三元运算符,或_条件运算符_ ,因为它可以用来替换`if else`语句,甚至是`if else if`语句。 语法:
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`condition ? ValueIfTrue : ValueIfFalse` 。这扩展到:
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```cpp
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if(condition)
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ValueIfTrue;
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else ValueIfFalse;
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```
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调用`ValueIfTrue`值有点错误,因为它不必是数字。像这样的东西:
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`condition ? FirstLevelTrueValue : ConditionIfFalse ? SecondLevelTrueValue : SecondLevelFalseValue`也有效,并且`if else if`语句被解释为以下`if else if`语句:
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```cpp
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if(condition)
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FirstLevelTrueValue;
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else if(ConditionIfFalse)
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SecondLevelTrueValue;
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else SecondLevelFalseValue;
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```
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类似地,嵌套的`if`语句也可以使用三元运算符。
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_Camper,你现在知道什么是令牌了。下一篇文章将是关于_ _恭喜_
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**祝大家好运**
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**快乐的编码! :)**
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**随意在FreeCodeCamp的GitHub页面或[FreeCodeCamp的论坛](https://forum.freecodecamp.org/)上询问任何问题[。](https://forum.freecodecamp.org/)**
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