how to print sum of numbs in c++ code example

Example 1: sum of digits in c++

int x, s = 0;
   cout << "Enter the number : ";
   cin >> x;
   while (x != 0) {
      s = s + x % 10;
      x = x / 10;
   }

Example 2: c++ sum of all numbers up to a number

// Method 1: Mathematical -> Sum up numbers from 1 to n 
int sum(int n){
	return (n * (n+1)) / 2;
}

// Method 2: Using a for-loop -> Sum up numbers from 1 to n 
int sum(int n){
	int tempSum = 0; 
  	for (int i = n; i > 0; i--){
     	tempSum += i;  
    }
  	return tempSum; 
}

// Method 3: Using recursion -> Sum up numbers from 1 to n 
int sum(int n){
	return n > 0 ? n + sum(n-1) : 0; 
}