The value of x will be 5. The postfix increment operator (x++) returns the value of x before incrementing it. This means that the expression 'x = x++' first gets the current value of x (which is 5), then increments x to 6, but then assigns the previously retrieved value (5) back to x. This is why x ends up as 5, not 6. To achieve the increment and assignment, you should use either 'x = x + 1', 'x += 1', or the prefix increment 'x = ++x'.