c++运算符

╰半夏微凉° 2023-02-27 12:05 32阅读 0赞

# c++运算符 #

作用：用于执行代码运算  
需要了解以下运算符  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NjcxNzMy_size_16_color_FFFFFF_t_70]

### 算术运算符 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NjcxNzMy_size_16_color_FFFFFF_t_70 1]

加减乘除：

*  作用：用来处理四则运算
 *  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	//加减乘除
    	int a1 = 10;
    	int b1 = 3;
    	cout << a1 + b1 << endl;
    	cout << a1 - b1 << endl;
    	cout << a1 * b1 << endl;
    	cout << a1 / b1 << endl;//两个小数只会保留整数部分。
    	int a2 = 10;
    	int b2 = 20;
    	cout << a2 / b2 << endl;
    	int a3 = 10;
    	int b3 = 0;
    	//cout << a3 / b3 << endl;除数不可以为0；
    	double d1 = 0.5;
    	double d2 = 0.25;
    	cout << d1 / d2 << endl;//两个小数可以相除。
    	d2 = 0.22;
    	cout << d1 / d2 << endl;//两个小数相除可以保留小数。
    	system("pause");
    	return 0;
    }

13
    7
    30
    3
    0
    2
    2.27273
    请按任意键继续. . .

取模：

*  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	//加减乘除
    	int a1 = 10;
    	int b1 = 3;
    	cout << a1 % b1 << endl;
    	int a2 = 10;
    	int b2 = 20;
    	cout << a2 % b2 << endl;
    	int a3 = 10;
    	int b3 = 0;
    	//cout << a3 % b3 << endl;取模运算是基于除法运算的，因为除数不可以为0，所以会出现错误
    	double d1 = 3.14;
    	double d2 = 1.1;
    	//cout << d1 % d2 << endl;//两个小数不可以做取模运算。
    	system("pause");
    	return 0;
    }

1
    10
    请按任意键继续. . .

前置递增和后置递增

*  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	//前置递增
    	int a = 10;
    	++a;//让变量进行加一
    	cout << "a = " << a << endl;
    	//后置递增
    	int b = 10;
    	b++;//让变量进行加一
    	cout << "b = " << b << endl;
    	//前置和后置的区别
    	//前置递增：先让变量进行加一，然后进行表达式运算
    	//后置递增：先进行表达式运算，然后让变量进行加一
    	int a2 = 10;
    	int b2 =++a2 * 10;
    	cout << "a2 = " << a2 << endl;
    	cout << "b2 = " << b2 << endl;
    	int a3 = 10;
    	int b3 = a3++ * 10;
    	cout << "a3 = " << a3 << endl;
    	cout << "b3 = " << b3 << endl;
    	system("pause");
    	return 0;
    }

a = 11
    b = 11
    a2 = 11
    b2 = 110
    a3 = 11
    b3 = 100
    请按任意键继续. . .

前置递减和后置递减

*  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	//前置递减
    	int a = 10;
    	--a;//让变量进行减一操作
    	cout << "a = " << a <<endl;
    	//后置递减
    	int b = 12;
    	b--;//让变量进行减一操作
    	cout << "b = " << b << endl;
    	//前置和后置的区别
    	//前置递减：先让变量进行减一操作，然后进行表达式运算
    	//后置递减：先进行表达式运算，然后让变量进行减一操作
    	int a2 = 10;
    	int b2 = --a2 * 10;
    	cout << "a2 = " << a2 << endl;
    	cout << "b2 = " << b2 << endl;
    	int a3 = 10;
    	int b3 = a3-- * 10;
    	cout << "a3 = " << a3 << endl;
    	cout << "b3 = " << b3 << endl;
    	system("pause");
    	return 0;
    }

a = 9
    b = 11
    a2 = 9
    b2 = 90
    a3 = 9
    b3 = 100
    请按任意键继续. . .

### 赋值运算符 ###

*  作用：对变量进行赋值运算  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NjcxNzMy_size_16_color_FFFFFF_t_70 2]
 *  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	int a;
    	a = 1;
    	cout << "a = " << a << endl;
    	a += 2;//a = a + 2
    	cout << "a = " << a << endl;
    	a -= 1;//a = a - 1
    	cout << "a = " << a << endl;
    	a *= 3;//a = a * 3
    	cout << "a = " << a << endl;
    	a /= 2;//a = a / 2
    	cout << "a = " << a << endl;
    	a %= 2;//a = a % 2
    	cout << "a = " << a << endl;
    	system("pause");
    	return 0;
    }

a = 1
    a = 3
    a = 2
    a = 6
    a = 3
    a = 1
    请按任意键继续. . .

### 比较运算符 ###

*  作用：用来比较值的大小，并返回一个真值或者假值，用1和0来代替真和假
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NjcxNzMy_size_16_color_FFFFFF_t_70 3]
 *  实例：

#include<iostream>
    using namespace std;
    #define Day 2
    int main() { 
    	cout << "大于的值" << (3 > Day) << endl;
    	cout << "小于的值" << (1 < Day) << endl;
    	cout << "大于或者等于的值" << (4 >= Day) << endl;
    	cout << "小于或者等于的值" << (5 <= Day) << endl;
    	system("pause");
    	return 0;
    }

大于的值1
    小于的值1
    大于或者等于的值1
    小于或者等于的值0
    请按任意键继续. . .

### 逻辑运算符 ###

##### 非 #####

*  !
 *  作用：进行取反运算。  
    ![在这里插入图片描述][20200722085907984.png]
 *  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	int a = 10;
    	cout << "a = " <<(!a) << endl;
    	cout << "a = " << (!(!a)) << endl;
    	system("pause");
    	return 0;
    }

a = 0
    a = 1
    请按任意键继续. . .

##### 或 #####

*  ||
 *  作用：
 *  ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NjcxNzMy_size_16_color_FFFFFF_t_70 4][]
 *  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	const int a = 1;
    	cout << "a = " << (a || 1) << endl;
    	cout << "a = " << (a || 0) << endl;
    	cout << "a = " << (0 || a) << endl;
    	cout << "a = " << (0 || 0) << endl;
    	system("pause");
    	return 0;
    }

a = 1
    a = 1
    a = 1
    a = 0
    请按任意键继续. . .

||运算，如果表达式左侧为假则执行右侧，如果表达式为真这不执行右侧。

##### 与 #####

*  &&
 *  作用：
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NjcxNzMy_size_16_color_FFFFFF_t_70 5]
 *  实例：

#include<iostream>
    using namespace std;
    int main() { 
    	int a = 1;
    	cout << "a = " << (a && 1) << endl;
    	cout << "a = " << (a && 0) << endl;
    	cout << "a = " << (0 && a) << endl;
    	cout << "a = " << (0 && 0) << endl;
    	system("pause");
    	return 0;
    }

a = 1
    a = 0
    a = 0
    a = 0
    请按任意键继续. . .

&&运算，如果表达式左侧为真则执行右侧，如果左侧为假则不执行右侧。  
下节：[c++程序流程结构][c]

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[20200722085907984.png]: https://img-blog.csdnimg.cn/20200722085907984.png
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[c]: https://blog.csdn.net/qq_45671732/article/details/107505455