Write a program in C++ to read a number n and find out the sum of the integers from 1 to
then from 1 to 3, then 1 to 4, and so on and to display the sum of the integers from 1 to
n.
For example, from
1 to 2 = 1
1 to 3 = 3
1 to 4 = 6
1 to 5 = 10
1 to 6 = 18
#include <iostream>
using namespace std;
//Summ out 1 -2 1-3 and out to display 1-n
int main() {
 int n;
 cout<<"Please enter n: ";
 cin>>n;
 int sum=1;
 for(unsigned i=2;i<=n;i++)
  {
   cout<<1<<"-"<<i<<" ="<<sum<<endl;
   sum+=i;
  }
 return 0;
}
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