自增自减

#include <iostream>

using namespace std;

int main() {
//变量声明
char c;
double x,y;

//测试自增
cout<<"++E and E++ :"<<endl;
c='B';
cout<<"c="<<++c<<endl;   //输出c=C
c='B';
cout<<"c="<<c++<<endl;   //输出c=B
x=1.5;
y=5+ ++x;               //加号后的空格不能少
cout<<"y="<<y<<endl;    //输出y=7.5
x=1.5;
y=5+x++;
cout<<"y="<<y<<endl;    //输出y=6.5
cout<<"--------------------"<<endl;
 
cout << "--------------------" << endl;
//测试自减
cout << "--E and E-- :" << endl;
c = 'B';
cout << "c=" << --c << endl;   //输出c=A
c = 'B';
cout << "c=" << c-- << endl;   //输出c=B
x = 1.5;
y = 5 + --x;
cout << "y=" << y << endl;    //输出y=5.5
x = 1.5;
y = 5 + x--;
cout << "y=" << y << endl;    //输出y=6.5

}