C++菜鸟学习笔记1

#include<iostream>using namespace std;int main(){cout<<"Enter two numbers:"<<endl;int v1,v2;cin>>v1>>v2;int lower,upper;if(v1<=v2){lower=v1;upper=v2;}else{lower=v2;upper=v1;}int sum=0;for(int val=lower;val<=upper;++val)sum+=val;cout<<sum<<endl;return 0;}