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  • 重载赋值运算符

    2021-01-20 13:16:26
    赋值运算符重载用于对象数据的复制  operator= 必须重载为成员函数 重载函数原型为:  类型 & 类名 :: operator= ( const 类名 & ) ; 案例:完善Name类,支持=号操作。     具体看如下代码: #define _...
  • 赋值运算符

    千次阅读 2021-03-02 11:04:42
    赋值运算符 开发工具与关键技术:eclipse java 作者: 梁峻豪 撰写时间:2021-02-18 赋值运算符是指为变量或常量指定数值的符号。赋值运算符的符号为“=”,它是双目运算 符,左边的操作数必须是变量,不能是常量...

    赋值运算符

    开发工具与关键技术:eclipse java 
    作者: 梁峻豪
    撰写时间:2021-02-18
    

    赋值运算符是指为变量或常量指定数值的符号。赋值运算符的符号为“=”,它是双目运算
    符,左边的操作数必须是变量,不能是常量或表达式。
    其语法格式如下所示:
    变量名称=表达式内容
    在 JAVA 语言中,“变量名称”和“表达式”内容的类型必须匹配,如果类型不匹配则需要自动
    转化为对应的类型。
    赋值运算符的优先级低于算术运算符,结合方向是自右向左;不是数学中的等号,它表示
    一个动作,即将其右侧的值送到左侧的变量中(左侧只允许是变量,不能是表达式或其他
    形式);不要将赋值运算符与相等运算符“==”混淆。
    赋值运算符与其他运算符一起使用,可以表达多种赋值运算的变异效果。例如,在基本的
    赋值运算符的基础之上,可以结合算术运算符,以及后面要学习的位运算符,组合成复合
    的赋值运算符。赋值运算符和算数运算符组成的复合赋值运算的含义及其使用实例如表 1
    所示。
    运算符 含义 实例 结果
    +=
    将该运算符左边的数值加上右边的数值, 其结果赋
    值给左边变量本身 int a=5; a+=2; a=7
    -=
    将该运算符左边的数值减去右边的数值, 其结果赋
    值给左边变量本身 int a=5; a-=2; a=3
    =
    将该运算符左边的数值乘以右边的数值, 其结果赋
    值给左边变量本身 int a=5; a
    =2; a=10
    /=
    将该运算符左边的数值整除右边的数值, 其结果赋
    值给左边变量本身 int a=5; a/=2; a=2
    %=
    将该运算符左边的数值除以右边的数值后取余,其
    结果赋值给左边变量本身 int a=5; a%=2; a=1
    在大型程序中,灵活运用这些赋值运算符可以提高程序的易读性,并且使程序更加容易保
    护。下面是一些使用赋值运算符的示例。
    int x, y, z; // 定义 3 个整型的变量
    x = y = z = 5; // 为变量赋初值为 5
    x += 10; // 等价于 x=x+10,结果 x=15
    y -= 3; // 等价于 y=y-3,结果 y=2
    z = 5; // 等价于 z=z5,结果 z=25
    x /= 4; // 等价于 x=x/4,结果 x=3
    z %= x; // 等价于 z=z%x,结果 z=1
    例 1
    例如,一件商品的单价从 10.25 元降了 1.25 元,而自己购买的数量由原来的两个增加到 10
    个,可以使用复合赋值运算符来计算购买商品的总价。
    实现代码如下:
    在这里插入图片描述

    保存代码并运行,输出的结果如下:
    图 1 运行结果
    注意:虽然 Java 支持这种一次为多个变量赋值的写法,但这种写导致程序的可读性降低,
    因此不推荐这样写。
    在该程序中,表示商品单价的 price 变量值为 10.25,而现在降了 1.25,在原来的基础上减
    去 1.25 即可获取现在的单价。而原来购买的数量为两个,现在需要购买 10 个,可以使用
    “count*=5”将数量乘以 5 倍之后的值赋值给 count 本身。
    赋值运算符还用于将表达式的值赋给变量,如下代码是正确的。
    double d1 = 12.34
    double d2 = d1 + 5; // 将表达式的值赋给 d2
    System.out.println(d2); // 输出 d2 的值,将输出 17.34
    赋值运算符还可与其他运算符结合,扩展成功能更加强大的赋值运算符

    展开全文
  • c语言中赋值运算符优先级Assignment operators are used to assign the value/result of the expression to a variable (constant – in case of constant declaration). While executing an assignment operator ...

    c语言中赋值运算符优先级

    Assignment operators are used to assign the value/result of the expression to a variable (constant – in case of constant declaration). While executing an assignment operator based statement, it assigns the value (or the result of the expression) which is written at the right side to the variable which is written on the left side.

    赋值运算符用于将表达式的值/结果赋给变量(常量-在常量声明的情况下)。 在执行基于赋值运算符的语句时,它将在右侧写入的值(或表达式的结果)分配给在左侧写入的变量。

    Syntax:

    句法:

    variable = value;
    
    

    赋值运算符的类型 (Type of the assignment operators)

    C/C++ language provides a simple assignment operator that is "=", but some of the other assignment operators (which are the combination of assignment and other operators) can be used.

    C / C ++语言提供了一个简单的赋值运算符 “ =” ,但是可以使用其他一些赋值运算符 (它们是赋值运算符和其他运算符的组合)。

    The assignment operators are,

    赋值运算符是

    SNo.OperatorDescriptionExample
    1=Simple assignment operatorx = 10
    2+=Add and assignment operatorx += 10
    3-=Subtract and assignment operatorx -=10
    4*=Multiply and assignment operatorx *=10
    5/=Divide and assignment operatorx /=10
    6%=Modules and assignment operatorx %=10
    7<<=Left shift and assignment operatorx <<= 10
    8>>=Right shift and assignment operatorx =>>10
    9&=Bitwise AND and assignment operatorx &= 10
    10|=Bitwise OR and assignment operatorx |= 10
    11^|Bitwise XOR and assignment operatorx ^= 10
    编号 操作员 描述
    1个 = 简单的赋值运算符 x = 10
    2 + = 添加和赋值运算符 x + = 10
    3 -= 减法和赋值运算符 x-= 10
    4 * = 乘法和赋值运算符 x * = 10
    5 / = 除法和赋值运算符 x / = 10
    6 %= 模块和赋值运算符 x%= 10
    7 << = 左移和赋值运算符 x << = 10
    8 >> = 右移和赋值运算符 x = >> 10
    9 &= 按位与和赋值运算符 x&= 10
    10 | = 按位或与赋值运算符 x | = 10
    11 ^ | 按位XOR和赋值运算符 x ^ = 10

    Note: On the right side, a value, expression, or any variable can be used.

    注意:在右侧,可以使用值,表达式或任何变量。

    1)简单赋值运算符(=) (1) Simple assignment operator (=))

    It is a simple assignment operator which is used to assign the value and the result of the expression to the variable.

    它是一个简单的赋值运算符,用于将值和表达式的结果赋值给变量。

    Syntax:

    句法:

    variable = value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of = operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0;
    
        x = 10;
        cout << "value of x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    value of x = 10
    
    

    2)加和赋值运算符(+ =) (2) Add and assignment operator (+=))

    It adds the value or result of the expression to the current value of the variable and assigns the result to the variable.

    它将表达式的值或结果添加到变量的当前值,并将结果分配给变量。

    Syntax:

    句法:

    variable += value;
    equivalent to: variable = variable + value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of += operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 10;
    
        cout << "Before the operation, x = " << x << endl;
        x += 5;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 15
    
    

    3)减法和赋值运算符(-=) (3) Subtract and assignment operator (-=))

    It subtracts the value or result of the expression to the current value of the variable and assigns the result to the variable.

    它将表达式的值或结果减去该变量的当前值,并将结果分配给该变量。

    Syntax:

    句法:

    variable -= value;
    equivalent to: variable = variable - value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of -= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 10;
    
        cout << "Before the operation, x = " << x << endl;
        x -= 5;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 5
    
    

    4)乘法和赋值运算符(* =) (4) Multiply and assignment operator (*=))

    It multiplies the value or result of the expression to the current value of the variable and assigns the result to the variable.

    它将表达式的值或结果与变量的当前值相乘,并将结果分配给变量。

    Syntax:

    句法:

    variable *= value;
    equivalent to: variable = variable * value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of *= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 10;
    
        cout << "Before the operation, x = " << x << endl;
        x *= 5;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 50
    
    

    5)除法和赋值运算符(/ =) (5) Divide and assignment operator (/=))

    It divides the value or result of the expression with the current value of the variable and assigns the result (quotient) to the variable.

    它将表达式的值或结果除以变量的当前值,然后将结果(商)分配给变量。

    Syntax:

    句法:

    variable /= value;
    equivalent to: variable = variable / value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of /= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 10;
    
        cout << "Before the operation, x = " << x << endl;
        x /= 5;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 2
    
    

    6)模块和赋值运算符(%=) (6) Modules and assignment operator (%=))

    It divides the value or result of the expression with the current value of the variable and assigns the result (remainder) to the variable.

    它将表达式的值或结果除以变量的当前值,然后将结果(余数)分配给变量。

    Syntax:

    句法:

    variable %= value;
    equivalent to: variable = variable % value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of %= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 10;
    
        cout << "Before the operation, x = " << x << endl;
        x %= 5;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 0
    
    

    7)左移和赋值运算符(<< =) (7) Left shift and assignment operator (<<=))

    It shifts the value of the variable by given number of bits (value) to the left and assigns the result to the variable.

    它将变量的值向左移动给定的位数(值),并将结果分配给变量。

    Syntax:

    句法:

    variable <<= value;
    equivalent to: variable = variable << value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of <<= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0x0A;
    
        cout << "Before the operation, x = " << x << endl;
        x <<= 0x02;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 40
    
    

    8)右移和赋值运算符(>> =) (8) Right shift and assignment operator (>>=))

    It shifts the value of the variable by the given number of bits (value) to the right and assigns the result to the variable.

    它将变量的值向右移动给定位数(值),并将结果分配给变量。

    Syntax:

    句法:

    variable >>= value;
    equivalent to: variable = variable >> value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of >>= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0x0A;
    
        cout << "Before the operation, x = " << x << endl;
        x >>= 0x02;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 2
    
    

    9)按位与和赋值运算符(&=) (9) Bitwise AND and assignment operator (&=))

    It performs the Bitwise AND (&) operation on the existing value of the variable with the given value and assigns the result to the variable.

    它对具有给定值的变量的现有值执行按位与(&)操作,并将结果分配给变量。

    Syntax:

    句法:

    variable &= value;
    equivalent to: variable = variable & value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of &= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0x0A;
    
        cout << "Before the operation, x = " << x << endl;
        x &= 0x02;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 2
    
    

    10)按位或与赋值运算符(| =) (10) Bitwise OR and assignment operator (|=))

    It performs the Bitwise OR (|) operation on the existing value of the variable with the given value and assigns the result to the variable.

    它对具有给定值的变量的现有值执行按位或(|)操作,并将结果分配给变量。

    Syntax:

    句法:

    variable |= value;
    equivalent to: variable = variable | value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of |= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0x0A;
    
        cout << "Before the operation, x = " << x << endl;
        x |= 0x02;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 10
    
    

    11)按位XOR和赋值运算符(^ =) (11) Bitwise XOR and assignment operator (^=))

    It performs the Bitwise XOR (^) operation on the existing value of the variable with the given value and assigns the result to the variable.

    它对具有给定值的变量的现有值执行按位XOR(^)操作,并将结果分配给变量。

    Syntax:

    句法:

    variable ^= value;
    equivalent to: variable = variable ^ value;
    
    

    Example:

    例:

    // C++ program to demonstrate the
    // example of ^= operator
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0x0A;
    
        cout << "Before the operation, x = " << x << endl;
        x ^= 0x02;
        cout << "After the operation, x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    Before the operation, x = 10
    After the operation, x = 8
    
    

    C++ program to demonstrate the example of various assignment operators

    C ++程序演示各种赋值运算符的示例

    // C++ program to demonstrate the example
    // of various assignment operators
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int x = 0;
    
        // = operator
        x = 20;
        cout << "x = " << x << endl;
    
        // += operator
        x += 5;
        cout << "x = " << x << endl;
    
        // -= operator
        x -= 5;
        cout << "x = " << x << endl;
    
        // *= operator
        x *= 5;
        cout << "x = " << x << endl;
    
        // /= operator
        x /= 3;
        cout << "x = " << x << endl;
    
        // %= operator
        x %= 5;
        cout << "x = " << x << endl;
    
        // <<= operator
        x <<= 5;
        cout << "x = " << x << endl;
    
        // >>= operator
        x >>= 5;
        cout << "x = " << x << endl;
    
        // &= operator
        x &= 5;
        cout << "x = " << x << endl;
    
        // |= operator
        x |= 5;
        cout << "x = " << x << endl;
    
        // ^= operator
        x ^= 10;
        cout << "x = " << x << endl;
    
        return 0;
    }
    
    

    Output:

    输出:

    x = 20
    x = 25
    x = 20
    x = 100
    x = 33
    x = 3
    x = 96
    x = 3
    x = 1
    x = 5
    x = 15
    
    

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    翻译自: https://www.includehelp.com/cpp-tutorial/assignments-operators-in-c-cpp.aspx

    c语言中赋值运算符优先级

    展开全文
  • 复合赋值运算符优先级 Compound-assignment operators provide a shorter syntax for assigning the result of an arithmetic or bitwise operator. They perform the operation on the two operands before ...

    c语言复合赋值运算符

    Compound-assignment operators provide a shorter syntax for assigning the result of an arithmetic or bitwise operator. They perform the operation on the two operands before assigning the result to the first operand.

    复合分配运算符为分配算术运算符或按位运算符的结果提供了较短的语法。 在将结果分配给第一个操作数之前,它们先对两个操作数执行运算。

    Java中的复合赋值运算符 ( Compound-Assignment Operators in Java )

    Java supports 11 compound-assignment operators:

    Java支持11种复合赋值运算符:

    
    +=   assigns the result of the addition.
    -=   assigns the result of the subtraction.
    *=   assigns the result of the multiplication
    /=   assigns the result of the division.
    %=   assigns the remainder of the division.
    &=   assigns the result of the logical AND.
    |=   assigns the result of the logical OR.
    ^=   assigns the result of the logical XOR.
    <<=  assigns the result of the signed left bit shift.
    >>=  assigns the result of the signed right bit shift.
    >>>= assigns the result of the unsigned right bit shift.

    用法示例 ( Example Usage )

    To assign the result of an addition operation to a variable using the standard syntax:

    使用标准语法将加法运算的结果分配给变量:

    
    //add 2 to the value of number
    number = number + 2;

    But use a compound-assignment operator to effect the same outcome with the simpler syntax:

    但是,使用复合赋值运算符以更简单的语法实现相同的结果:

    
    //add 2 to the value of number
    number += 2;

    翻译自: https://www.thoughtco.com/compound-assignment-operator-2034054

    c语言复合赋值运算符

    展开全文
  • 主要介绍了C++中赋值运算符与逗号运算符的用法详解,是C++入门学习中的基础知识,需要的朋友可以参考下
  • 跟汤老师学Java笔记:赋值运算符 完成:第一遍 1.赋值运算符有哪6种? 6种赋值运算符: = 简单赋值、+= 加法赋值、-= 减法赋值、*= 乘法赋值、 、除法赋值/= 、%= 求模赋值 package code02; public class Test03 { ...

    4.赋值运算符 :赋值运算符有哪6种???

    学习:第7遍


    1.赋值运算符有哪6种???

    6种赋值运算符:
    ——》= 简单赋值
    ——》+= 加法赋值
    ——》-= 减法赋值
    ——》= 乘法赋值
    ——》除法赋值/=
    ——》%= 求模赋值

    a -= 2;
    等价于a = a-2

    Java不支持连等写法,比如int b=c=6;


    public class Test{
    	public static void main(String[] args)
    	{
    		int a = 5;
    		a += 2; 
    		System.out.println("a+=2值为 : "+a);
    		a -= 2; 
    		System.out.println("a-=2 值为: "+a);
    		a *= 2; 
    		System.out.println("a*=2 值为: "+a);
    		a /= 2; 
    		System.out.println("a/=2 值为: "+a);
    		a %= 2; 
    		System.out.println("a%=2 值为: "+a);
    	
    
    	}
    }
    
    
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  • 赋值运算符赋值运算符是指为变量或常量指定数值的符号。赋值运算符的符号为“=”,它是双目运算符,左边的操作数必须是变量,不能是常量或表达式。   语法:变量名称=表达式内容   在 Java 语言中,“变量...
  • 今天突然被搞蒙,重新复习了一下 多说无益,直接上代码 #include #include using namespace std; class A { public: char * x; int y; A() { cout<<无参构造<x>y=0; } A(int n) ...拷贝构造<x>x,a.x
  • C++赋值运算符

    2020-09-27 20:10:08
    C++赋值运算符C++赋值运算符重载赋值运算符自我赋值 C++赋值运算符 三种赋值运算符,举些例子: // 拷贝赋值运算符 Sales_data trans, accum; trans = accum; // 使用Sales_data的拷贝赋值运算符 // 移动赋值运算符...
  • python基础 字符串 运算符 1 布尔运算符 布尔运算符分为两种 1. True 为真 还通俗将就是正确 通过 通电等 2. Flase 为假 与True正好相反 表示不真确 不能通过 不同电 True 数值就是 1 False 数值就是0 ...
  • 文章目录算术运算符关系运算符逻辑运算符赋值运算符 算术运算符 算术运算符有:+ - * / % ++ – ++分为前置++ 和后置++,这俩者有所不同。 前置++是先加后用,后置++是先用后加。 前置–是先加后用,后置–是先用后...
  • 我们可以看见类的默认拷贝构造函数和赋值运算符,都是对属性进行值拷贝,但是它们之间有什么区别吗?在什么情况下会调用它们?下面会详细介绍. 2)本篇涉及内容: 拷贝构造函数和赋值运算符的区别 如何实现赋值...
  • 加法赋值运算符It’s the Addition assignment operator. Let’s understand the += operator in Java and learn to use it for our day to day programming. 它是加法赋值运算符。 让我们了解Java中的+ =运算符,并...
  • (一)赋值运算符 赋值符号“=”就是赋值运算符,它的作用是将一个数据赋给一个变量。如“a=3” 的作用是执行一次赋值操作(或称赋值运算),把常量 3 赋给变量 a,也可以将一个表 达式的值赋给一个变量。 (二)...
  • 可以在赋值语句中通过赋值运算符“=”对字符数组整体赋值 D.不可以用关系运算符对字符数组中的字符串进行比较 为啥c是错的嘞? 难道s[10]={"happy"}这样 的语句不算是通过...
  • 赋值运算符 比较运算符 逻辑运算符 位运算符 三目运算符 C. 算数运算符有哪些 + , - , * , / , % , ++ , -- (+在有字符串参与中被称为字符串连接符) 注意事项: a. 整数相除只能得到整数。如果想得到...
  • 赋值运算符 = 变量名 = 表达式; 将右边的值给左边的变量 int a = (b+3)+(b-1); 表达式就是符号(如加好、减号)与操作数(如b,3等)的组合 算术运算符 +、-、*、/、%、++、– 复合赋值运算符:+=、-=、*=、/=、%...
  • 派生类的赋值符重载情况分析父类和子类都是系统默认子类系统默认,父类自实现赋值运算符重载父类系统默认,子类自实现赋值运算符重载子类和父类都自实现赋值运算符重载父类显式调用语法赋值顺序图示注解代码演示内...
  • C++ 拷贝赋值运算符

    2020-11-18 20:57:50
    C++ 重载运算符拷贝赋值运算符 重载运算符 ==,>,>=,<,<=,!=,+,-;++,–,+,-,cout,cin,<<和>>,=赋值运算符。 两个对象进行 = = 比较,要重载 = = 运算符。 重载:写一个从原函数,成员函数...
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  • 1.将已有的对象赋给另一个对象时,将调用重载的赋值运算符。 2.初始化对象时,并不一定会使用赋值操作符: StringBad metoo=knot; // use copy constructor, possibly assignment, too 这里,metoo是一个新创建的...
  • 1.什么是赋值运算符赋值运算符就是将赋值号(看着像等号的符号,下同)右边的值存储到赋值号左边的变量(的存储空间)中。 -赋值运算符分为两种: 简单类型的赋值运算符 = 复杂类型的赋值运算符 += -=...
  • python 赋值运算符

    2020-11-19 06:14:11
    赋值运算符用来把右侧的值传递给左侧的变量(或者常量);可以直接将右侧的值交给左侧的变量,也可以进行某些运算后再交给左侧的变量,比如加减乘除、函数调用、逻辑运算等。Python中最基本的赋值运算符是等号=;...
  • 01 赋值运算符重载的需求 有时候希望赋值运算符两边的类型可以不匹配,比如:把一个 int 类型变量赋值给一个Complex(复数)对象,或把一个 char* 类型的字符串赋值给一个字符串对象,此时就需要重载赋值运算符‘=’...
  • 1、赋值运算符 下表列出了 C 语言支持的赋值运算符: 运算符 描述 实例 = 简单的赋值运算符,把右边操作数的值赋给左边操作数 C = A + B 将把 A + B 的值赋给 C += 加且赋值运算符,把右边操作数加上左边...
  • 在C语言中11种赋值运算符的具体含义。这些位运算都是与二进制码有关的,所以多弄弄也就会了

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