小编vvv*_*vvv的帖子

static void insert_at_bottom(char x){

    if(st.isEmpty())
        st.push(x);

    else{
        /* All items are held in Function Call Stack until we
           reach end of the stack. When the stack becomes
           empty, the st.size() becomes 0, the
           above if part is executed and the item is inserted
           at the bottom */

        char a = st.peek();
        st.pop();
        insert_at_bottom(x);

        //push all the items held in Function Call Stack
        //once the item is inserted at the bottom
        st.push(a);
    }
}

在上面的代码中，我对这一步有一个疑问：

if(st.isEmpty())
        st.push(x);

之后我们不需要 return 语句吗st.push(x) …