编写一个控制光标位置和形状的程序，改程序具有以下功能

1：可用光标移动键↑↓←→来移动光标2：当光标已在第0列，则按←键，光标定在上一行的最后一列，若已在屏幕的左上角，则光标不动，且给出响铃，按→键时的边界处理类似。3：当光标在第0行，则按↑键，光标不动，且给出响铃，按↓键时的边界处理类似。4：按Home或End键，则光标移到当前行的行首或行尾.5:若按下数字或字母，则把该字符从当前位置依次显示到屏幕顶（在新位置显示当前字符时，原位置的符号被抹去）。6：按Esc ，结束-The preparation of a control cursor position and shape of the process, change process has the following features

1: The available cursor keys ↑ ↓ ← → to move the cursor 2: When the cursor in the first 0, press ← key, the cursor on the line set at the last one, if it has the upper left corner of the screen, the cursor does not move, and given the ring, press → key when dealing with similar border. 3: When the cursor row 0, press ↑ key, the cursor does not move, and given the ring, press ↓ key when dealing with similar boundaries. 4: Press Home or End key, then move the cursor to the first row the current row or the end of the line .5: If press the number or letter, put the order of the characters from the current location to the screen top (in the new location to display the current character The original location of the sign to be erased). 6: press Esc, the end of