指派運算

指派的概念其實非常的簡單，最基本的指派運算子就是「=」。等號可以將右邊的值寫入左邊的變數中。

指派運算子

A += B;等同於A = A + B; 以下為其他的指派運算子：

運算子	意思	範例
=	指派	A = B
+=	相加並指派	A += B
-=	相減並指派	A -= B
*=	相乘並指派	A *= B
/=	相除並指派	A /= B
%=	取餘數並指派	A %= B
|=	或(OR)並指派	A |= B
&=	且(AND)並指派	A &= B
^=	XOR並指派	A ^= B
<<=	向左位移並指派	A <<= B
>>=	向右位移並指派	A >>= B

範例Code

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    int b = 2;
    
    cout << "a = " << a << ", b = " << b << ", a += b : " << (a += b) << endl;
    cout << "a = " << a << ", b = " << b << ", a -= b : " << (a -= b) << endl;
    cout << "a = " << a << ", b = " << b << ", a *= b : " << (a *= b) << endl;
    cout << "a = " << a << ", b = " << b << ", a /= b : " << (a /= b) << endl;
    cout << "a = " << a << ", b = " << b << ", a |= b : " << (a |= b) << endl;
    cout << "a = " << a << ", b = " << b << ", a <<= b : " << (a <<= b) << endl;
    
    return 0;
}   

範例輸出：

a = 5, b = 2, a += b : 7

a = 7, b = 2, a -= b : 5

a = 5, b = 2, a *= b : 10

a = 10, b = 2, a /= b : 5

a = 5, b = 2, a |= b : 7

a = 7, b = 2, a <<= b : 28