title: Generate random values with fixed sum in C++
body: <p>I saw tons of answers to this question on the web but, can you believe me? I still don't get the solution of this problem. I have an array of values. The size of this array is "n". I have also the defined value "sum". What I want is to generate "n" random values in such a way that their sum is equals to "sum", preferably uniformly distributed, otherwise (for example) having the first random number equals to "sum" and the rest equals to zero is not that nice. I need two algorithms which accomplish this task. One with positive Integers and one with positive Floats. Thanks a lot in advance!</p>