变量的自增和自减

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16

#include <iostream>
using namespace std;
int main(){
	int n1,n2=5;//赋值令n1和n2的值都是5
          n2++;//n2增加1,
          cout<<"n2="<<n2<<endl; 
          n2--;
          cout<<"n2="<<n2<<endl;
	     ++n2;//n2增加1
          cout<<"n2="<<n2<<endl;
	n1=n2++;//++在变量右侧，则先取变量值再自增，即先将n2的值7赋给n1，再将n2增加1变成8
	cout<<"n1="<<n1<<",n2="<<n2<<endl;
	n1=++n2;//++在变量左侧，则先自增再取值，即先将n2增加1变成9，再将n2的值9赋给n1
	cout<<"n1="<<n1<<",n2="<<n2<<endl;
	return 0;
}