C++基础 自增与自减

#include <iostream>
using namespace std;
int main(){
	//后置递增  先计算在递增 
	int a1=1,b1=0;
	b1=b1+(a1++);//b1=1 
	cout<<"a1="<<a1<<endl;
	cout<<"b1="<<b1<<endl;
	
	//前置递增  先递增后计算 
	int a2=1,b2=0;
	b2=b2+(++a2);
	cout<<"a2="<<a2<<endl;
	cout<<"b2="<<b2<<endl;
	
	//后置递减  先计算后递减 
	int a3=1,b3=0;
	b3=b3+(a3--);//a3=0,b3=1
	cout<<"a3="<<a3<<endl;
	cout<<"b3="<<b3<<endl;
	
	int a4=1,b4=0;
	b4=b4+(--a4);//a4=0,b4=0
	cout<<"a4="<<a4<<endl;
	cout<<"b4="<<b4<<endl;
	return 0;
}