Write a C++ program that reads an integer and calculates the sum of all its digits.
A single integer N.
Print the sum of digits.
-1000000000 <= N <= 1000000000
12345
15
Extracts individual digits using modulus 10 and accumulates their sum.
#include <iostream>
#include <cmath>
int main() {
long long n;
if (std::cin >> n) {
// Write your code here
}
return 0;
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