Sum of an array using while loop

This is the output. This doesn't look right.

Sum from whileloop = 0
Sum from whileloop = 4
Sum from whileloop = 11
Sum from whileloop = 17
Press any key to continue . . .

It will run but you are creating infinite loop, increment "a" at the end of while..

int a = 0, sum = 0;
int[] x = { 4, 7, 6, 5 };
 
while (a < x.Length)
{
   Console.WriteLine("Sum from whileloop = {0}", sum);
   sum += x[a];
    a = a + 1; //increment a
}