07.cpp

#include <iostream>
using namespace std;

int main (){
int low, up, sum=1, olow;
cout<<"This program calculates the sum of 2 integer numbers that you give"<<endl;
cout<<"Please, give me lower number: ";
cin>>low;
olow=low;
cout<<"Please give me upper number: ";
cin>>up;
if (low<=up){
do {
  low++;
  sum=sum+low;
} while(low!=up);
cout<<"The sum of "<<olow<<" and "<<up<<" numbers is "<<sum<<endl;}
else{
  cout<<"The number that you typed was upper than the upper number";
}
return 0;
}