C and C++ program to find the sum of first N terms

#include "conio.h"
#include "iostream.h"
// Function to find the sum of series 1 + 2 + 3 + ......+ N
int sumseries(int N)
{
 int i, sum = 0;
 for(i = 0; i <= N; i++)
  sum = sum + i;
 return(sum);
}
void main()
{
 clrscr();
 int n, nsum = 0;
 cout << "Enter the value of N : ";
 cin >> n;
 nsum = sumseries(n);
 cout << "The sum up to N is : " << nsum;
}

Source: www.LearnCandCpp.com