C++ program to calculate the sum of numbers from 1 to 100

#include <iostream>
using namespace std;

int main()
{
   int sum=0;

   for(int i=1; i<=100; i++)
   {
      // adding 1 to 100 numbers
      sum=sum+i;
   }
   cout << "\n The sum of numbers from 1 to 100 is: "<<sum << endl;
   return 0;
}

The sum of numbers from 1 to 100 is: 5050

#include <iostream>
using namespace std;

int main()
{
   int i = 1, sum=0;
   while (i <= 100) {
      sum = sum+i;
      i++;
   }
   cout << "\n The sum of numbers from 1 to 100 is: "<<sum << endl;
   return 0;
}