Do Statement that isn't working correctly

Question

I can't figure out why the second do statement is not repeating. It appears to be exiting regardless of the while statement being true or false. I feel like it's something small I'm missing, but any help is greatly appreciated. Thanks!

    public void ShellSort()
{
    int gap = size/2;
    do
    {
        boolean swapflag = true;
        do
        {
            swapflag = false;
            for(int s = 0; s < (size-gap); s++)
                if (arr[s] > arr[s + gap])
                    {
                        int temp = arr[s];
                        arr[s] = arr[s + gap];
                        arr[s + gap] = temp;
                        swapflag = true;
                    }
        } while (swapflag = true);
        gap = gap/2;
    } while (gap >= 0);
}

Answer 1

replace below line

while (swapflag = true); //this say that you are always setting swapflag to true

with

while (swapflag);// check condition true or false

Answer 2

代码中的while语句为while (swapflag = true); 因此，您的交换标志设置为true。内部do-while循环永远不会终止。 该陈述应该是：

while(swapflag==true)

或while (swapflag)

Answer 3

那是因为你在first while语句中使用了赋值operator =而不是关系运算符==。 =赋值运算符将swapflag设置为true而不是比较。 改变它 而（swapflag ==真） ==是关系运算符，它将检查swapflag是否为true 或者（swapflag）