#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 of"<<lower
        <<"to"<<upper
        <<"inclusive is"
        <<sum<<endl
    return 0;
}

cout<<" Sum of"<<lower
        <<"to"<<upper
        <<"inclusive is"
        <<sum<<endl;  //少了分号