C++ 赋值运算符

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;

示例：

#include <iostream>
using namespace std;

int main() {

	// 赋值运算符

	// = 
	int a = 10;
	a = 100;
	cout << "a = " << a << endl; // 100

	// +=
	a = 10;
	a += 2; // a = a + 2;
	cout << "a = " << a << endl; // 12

	// -=
	a = 10;
	a -= 2; // a = a - 2
	cout << "a = " << a << endl; // 8

	// *=
	a = 10;
	a *= 2; // a = a * 2
	cout << "a = " << a << endl; // 20

	// /=
	a = 10;
	a /= 2; // a = a / 2
	cout << "a = " << a << endl; // 5

	// %=
	a = 10;
	a %= 2; // a = a % 2
	cout << "a = " << a << endl; // 0

	system("pause");

	return 0;
}