3.2 赋值运算符

**作用：**用于将表达式的值赋给变量

赋值运算符包括以下几个符号：

| **运算符** | **术语** | **示例**   | **结果**  |

| ---------- | -------- | ---------- | --------- |

| =          | 赋值     | a=2; b=3;  | a=2; b=3; |

| +=         | 加等于   | a=0; a+=2; | a=2;      |

| -=         | 减等于   | a=5; a-=3; | a=2;      |

| *=         | 乘等于   | a=2; a*=2; | a=4;      |

| /=         | 除等于   | a=4; a/=2; | a=2;      |

| %=         | 模等于   | a=3; a%2;  | a=1;      |

```C++

int main() {

    int a = 10;

    a = 100;

    cout << "a = " << a << endl;

    a = 10;

    a += 2; // a = a + 2;

    cout << "a = " << a << endl;

    a = 10;

    a -= 2; // a = a - 2

    cout << "a = " << a << endl;

    a = 10;

    a *= 2; // a = a * 2

    cout << "a = " << a << endl;

    a = 10;

    a /= 2;  // a = a / 2;

    cout << "a = " << a << endl;

    a = 10;

    a %= 2;  // a = a % 2;

    cout << "a = " << a << endl;

    system("pause");

    return 0;

}

```