（六十八）组合运算符

运算符+、-、*、/、%和=分别是加、减、乘、除、求余和赋值。

前面5个运算符，可以和赋值运算符“=”结合使用。

上代码：

#include<iostream>

int main()
{
	using namespace std;
	int a = 1, b = 5;	//初始化a=1，b=5
	cout << "a = " << a << "\nb = " << b << endl;

	a += b;	//a+=b实际上是a=a+b
	cout << endl << "a += b" << endl;
	cout << "a = " << a << "\nb = " << b << endl;

	a -= b;	//a-=b实际上是a=a-b
	cout << endl << "a -= b" << endl;
	cout << "a = " << a << "\nb = " << b << endl;

	a *= b;	//a*=b实际上是a=a*b
	cout << endl << "a *= b" << endl;
	cout << "a = " << a << "\nb = " << b << endl;

	a /= b;	//a/=b实际上是a=a/b，注意，由于是int，所以会取整数部分
	cout << endl << "a /= b" << endl;
	cout << "a = " << a << "\nb = " << b << endl;

	a %= b;	// a%=b实际上是a=a%b，即求a/b的余数
	cout << endl << "a %= b" << endl;
	cout << "a = " << a << "\nb = " << b << endl;
	system("pause");
	return 0;
}

输出：

a = 1
b = 5

a += b
a = 6
b = 5

a -= b
a = 1
b = 5

a *= b
a = 5
b = 5

a /= b
a = 1
b = 5

a %= b
a = 1
b = 5
请按任意键继续. . .

注意：

①组合运算符，对于等号右边的变量/常量并没有进行操纵，影响的是左边的变量。

②组合运算符，实际上就是 左边的数字+-*/右边的数字 后，赋值给左边的数字。

即a*=b 等价于a=a*b;