Using while loop to calculate 1+2+...+n

Question

I write programm but only show input
Sum is 0

Answer 1

Jo'shqinbek Bekniyozov If u r looking for a program to add n natural numbers then here is the solution:

#include <iostream>
using namespace std;

int main() {
int n;
int sum=0;
cin>>n; //no of natural number
while(n)
{sum+=n;
n--;
}
cout<<sum;
return 0;
}

Sample input:5
Output:15

Answer 2

int n = 5;
int sum = 0;
for(int i = 0; i < n; i++){
sum += i;
}

I think this is what you are looking for.

It would be nice if you can show us your code so people can help you find your errors.