Simple Adding

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Challenge

Using the C# language, have the function  SimpleAdding(num) add up all the numbers from 1 to  num. For example: if the input is 4 then your program should return 10 because 1 + 2 + 3 + 4 = 10. For the test cases, the parameter  num will be any number from 1 to 1000. 

Sample Test Cases

Input:12

Output:78

Input:140

Output:9870

Simple Adding算法求数的和(等差数列)

        public static int SimpleAdding(int num)
        {
            int sum = 0;
            while (num > 0)
            {
                sum += num--;
            }
            num = sum;
            return num;
        }