C++ 运算符 (3)

#include <iostream>
using namespace std;


int main() {

    /*
    * ---------------------------------------------------------------------------------
    *算数运算符
    * 加减乘除 (需要注意除法 除数不能为0  两个整数相除，会自动去掉小数位)
    */
    int a = 1;
    int b = 2;
    int c = 2;
    int d = (b + c - a) * b / c;
    cout << "d = " << d << endl;

    /*
    * 取模运算  (取余数)
    * 除数不能为0
    * 小数也不允许进行取模运算
    */

    int i = 10;
    int y = i % 3;
    cout << "y = " << y << endl;

    /*
    *  ---------------------------------------------------------------------------------
    * 递增递减
    */

    //前置递增 后置递增
    int a1 = 10;
    int a2 = 10;
    ++a1;
    a2++;
    cout << "a1与a2的值：" << a1 << "与" << a2 << endl;

    //前后递增的区别在于 ，前置递增在表达式之前先递增在执行表达式  后置递增是先执行表达式在进行递增
    int a3 = ++a1 * 10;
    int a4 = a2++ * 10;
    cout << "a1 - a3 -a2 - a4：" << a1 << "-" << a3 << "-" << a2 << "-" << a4 << endl;



    /*
    * ---------------------------------------------------------------------------------
    * 赋值运算符
    * 用于将表达式的值赋给变量
    *   =  +=  -=  *=  /=  %=
    */
    //例如
    int aa = 10;
    aa += 2;
    cout << "aa = " << aa << endl;


    /*
    * ---------------------------------------------------------------------------------
    * 比较运算符
    * 用于表达式的比较，并返回一个真值或者假值
    *  ==  !=  <  >  <=  >=
    */
    //例如
    int  aaa = 1;
    int  aaa2 = 4;
    bool  flag = false;
    flag = (aaa < aaa2);
    cout << "flag = " << flag << endl;


    /*
    * ---------------------------------------------------------------------------------
    * 逻辑运算符
    * 用于表达式的比较，并返回一个真值或者假值
    *  ！（非） && （与）  || (或)
    */
    //例如
    flag =  !(aaa < aaa2);
    cout << "flag = " << flag << endl;

    system("pause");
    return 0;

}