C++ program to calculate the sum of all five-digit odd numbers? -


i'm having problem following simple code, don't know why output become negative... program supposed calculate sum of odd , five-digit numbers 10001, 10003, 10005, etc.

#include <iostream>  using namespace std;  int main() {     int num, sum = 0;      (num = 10001 ; num <= 99999 ; num+=2){         sum += num;     }      cout << num << " " << sum;     return 0; }

it means there overflow of type int. type can not represent sum. advice declare variable sum like

long long int sum = 0;

after can compare result maximum value stored in type int. example

#include <limits>  //...  std::cout << std::numeric_limits<int>::max() << " " << sum << std::endl;;

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