Yurttas/PL/OOL/Cplusplus/F/02/04/022/01/00/sum 00.cpp

 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}