How do you sum a number in C++?

Herein, how do you sum a number in C++?

C++ Program to Display the Sum of the Digits of a given Number

1. * C++ program to Display the Sum of the digits of a given Number.
2. #include<iostream>
3. using namespace std;
4. int val, num, sum = 0;
5. cout << "Enter the number : ";
6. cin >> val;
7. num = val;
8. while (num != 0)

Likewise, how do you sum a number in a for loop? Getting the sum using a for loop implies that you should:

1. Create an array of numbers, in the example int values.
2. Create a for statement, with an int variable from 0 up to the length of the array, incremented by one each time in the loop.
3. In the for statement add each of the array's elements to an int sum.

Beside above, how do you find the digit sum of a number?

The digit sum of a number, say 152, is just the sum of the digits, 1+5+2=8. If the sum of the digits is greater than nine then the process is repeated. For example, the sum of the digits for 786 is 7+8+6=21 and the sum of the digits for 21 is 3 so the digit sum of 786 is 3.

What does += mean in C++?

+= Add AND assignment operator, It adds right operand to the left operand and assign the result to left operand. C += A is equivalent to C = C + A. -= Subtract AND assignment operator, It subtracts right operand from the left operand and assign the result to left operand.