int main()
{
    cout << "This Program was written by Nehal Shah\n" << endl;
 
    int num, total;
    cout << "Please enter an integer number:\t\t\t";
    cin >> num;
    while ( num < 0 )
{
    cout << "\t********************************\n";
    cout << "\t**********  ERROR  *************\n";
    cout << "\t********************************\n";
    cout << " --------------------------------------\n";
    cout << "  Only input a positive integer number\n";
    cout << " --------------------------------------\n\n";
    cout << "Please enter the number again:\t\t\t";
      cin >> num;
}
 
      for (int total = num; total <= num; num++)
          cout << "The sum of all number from 1 up to " << num << " is:\t";
          cout << (num+ num) << endl;
    system("PAUSE");
    return 0;
}

#include <iostream>
#include <ios>
#include <limits>
 
int main()
{
  int limit;
 
  std::cout<<"This Program was written by Julienne Walker\n\n";
  std::cout<<"Please enter a positive upper limit (exclusive): ";
 
  while ( !( std::cin>> limit ) || limit < 0 ) {
    // Correct truly invalid input as well as negative values
    std::cin.clear();
    std::cin.ignore ( std::numeric_limits<std::streamsize>::max(), '\n' );
    std::cout<<"Error, invalid input. Please enter a positive number: ";
  }
 
  if ( !std::cin.eof() ) {
    int sum = 0;
 
    for ( int i = 1; i < limit; i++ )
      sum += i;
 
    std::cout<<"The sum of [1,"<< limit <<") is "<< sum <<'\n';
  }
}

for ( int i = 1; i < limit; i++ )
      sum += i;

for ( int i = 1; i <= limit; i++ )
      sum += i;

#include <iostream>
using namespace std;
int main()
{
  int limit;
 
  cout<<"This Program was written by Julienne Walker\n\n";
  cout<<"Edited by ChaseVoid"<<endl;
  cout<<"Please enter a positive upper limit (exclusive): ";
 
  while ( !( cin>> limit ) || limit < 0 ) 
  {
    // Correct truly invalid input as well as negative values
    cout<<"Error, invalid input. Please enter a positive number: ";
  }
 
     int sum = 0;
 
    for ( int i = 1; i <= limit; i++ )
      sum += i;
 
    cout<<"The sum of [1 - "<< limit <<"] is "<< sum <<'\n';
 
 
  cin.ignore();
  cin.get();
 
}

std::cin.ignore ( std::numeric_limits<std::streamsize>::max(), '\n' );

#include <stdio.h>
 
// cin.ignore ( numeric_limits<streamsize>::max(), '\n' );
size_t i;
 
for ( i = 0; i < (size_t)-1; i++ ) {
  int ch = getchar();
 
  if ( ch == EOF || ch == '\n' )
    break;
}