1/*
2 Copyright(C) 1998
3 All Rights Reserved. Salih Yurttas, ZCubes, BitsOfCode Software Systems, Inc..
4
5 Permission to use, copy, modify, and distribute this
6 software and its documentation for EDUCATIONAL purposes
7 and without fee is hereby granted provided that this
8 copyright notice appears in all copies.
9
10 date : January 1, 1998.
11 author : Salih Yurttas.
12
13 sum_00.cpp
14*/
15
16
17#include <iostream>
18
19using namespace std;
20
21int sum(int);
22
23int main(int argc, char* argv[]) {
24
25 int n;
26
27 cout << "--> n : ";
28 cin >> n;
29
30 cout << endl;
31
32 int a = sum(n);
33
34 if(a<1) {
35 cerr << "Input n should be >=1." << endl;
36 exit(1);
37 }
38 else
39 cout << "The sum from 1 to " << n << " = " << a << endl;
40
41}