C++：赋值运算符（17）

赋值也就是将后面的值赋值给变量，这里最常用的就是= ，a=1那么a就是1，此外还包含以下的赋值运算

|-----|-----|-------------------|------|
| = | 等于 | int a = 1; a=10 | a=10 |
| += | 加等于 | int a = 1; a+=1; | a=2 |
| -= | 减等于 | int a = 1; a-=1; | a=0 |
| *= | 乘等于 | int a = 2; a*=5; | a=10 |
| /= | 除等于 | int a = 10; a/=2; | a=5 |
| %= | 模等于 | int a = 10; a%=2; | a=0 |

---

接下来我用不一样的数去演示一遍

加等于

#include<iostream>
using namespace std;

int main()
{
	//	=	等于
	int a = 1;
	a = 10;
	cout << "a = " << a << endl;

	//	+=	加等于
	a += 10;	// a += 10;	== a = a + 10 ;
	cout << "a = " << a << endl;


	system("pause");
	return 0;
}

a += 10; 等于 a = a + 10；

---

减等于

#include<iostream>
using namespace std;

int main()
{
	//	=	等于
	int a = 1;
	a = 10;
	cout << "a = " << a << endl;

	//	+=	加等于
	a += 10;	// a += 10;	== a = a + 10 ;
	cout << "a = " << a << endl;

	//	-=	减等于
	a = 10;
	a -= 5;		// a -= 5;	== a = a - 5 ;
	cout << "a = " << a << endl;

	system("pause");
	return 0;
}

a -=5 等于 a = a - 5

---

乘等于

#include<iostream>
using namespace std;

int main()
{
	//	=	等于
	int a = 1;
	a = 10;
	cout << "a = " << a << endl;

	//	+=	加等于
	a += 10;	// a += 10;	== a = a + 10 ;
	cout << "a = " << a << endl;

	//	-=	减等于
	a = 10;
	a -= 5;		// a -= 5;	== a = a - 5 ;
	cout << "a = " << a << endl;

	//	*=	乘等于
	a = 10;
	a *= 10;
	cout << "a = " << a << endl;

	system("pause");
	return 0;
}

a *= 10 等于 a = a * 10

---

除等于

#include<iostream>
using namespace std;

int main()
{
	//	=	等于
	int a = 1;
	a = 10;
	cout << "a = " << a << endl;

	//	+=	加等于
	a += 10;	// a += 10;	== a = a + 10 ;
	cout << "a = " << a << endl;

	//	-=	减等于
	a = 10;
	a -= 5;		// a -= 5;	== a = a - 5 ;
	cout << "a = " << a << endl;

	//	*=	乘等于
	a = 10;
	a *= 10;
	cout << "a = " << a << endl;

	//	/=	除等于
	a = 10;
	a /= 2;
	cout << "a = " << a << endl;

	system("pause");
	return 0;
}

a /=2 等于 a=a/2

---

模等于

#include<iostream>
using namespace std;

int main()
{
	//	=	等于
	int a = 1;
	a = 10;
	cout << "a = " << a << endl;

	//	+=	加等于
	a += 10;	// a += 10;	== a = a + 10 ;
	cout << "a = " << a << endl;

	//	-=	减等于
	a = 10;
	a -= 5;		// a -= 5;	== a = a - 5 ;
	cout << "a = " << a << endl;

	//	*=	乘等于
	a = 10;
	a *= 10;
	cout << "a = " << a << endl;

	//	/=	除等于
	a = 10;
	a /= 2;
	cout << "a = " << a << endl;

	//	%=	模等于
	a = 9;
	a %= 2;
	cout << "a = " << a << endl;

	system("pause");
	return 0;
}

a%=2 等于 a=a%2